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Cui X, Fan X, Xu S, Wang S, Niu F, Zhao P, Yang B, Liu W, Guo X, Jiang YQ. WRKY47 transcription factor modulates leaf senescence through regulating PCD-associated genes in Arabidopsis. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 213:108805. [PMID: 38861819 DOI: 10.1016/j.plaphy.2024.108805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 06/05/2024] [Accepted: 06/06/2024] [Indexed: 06/13/2024]
Abstract
Transcription factors play crucial roles in almost all physiological processes including leaf senescence. Cell death is a typical symptom appearing in senescing leaves, which is also classified as developmental programmed cell death (PCD). However, the link between PCD and leaf senescence still remains unclear. Here, we found a WRKY transcription factor WRKY47 positively modulates age-dependent leaf senescence in Arabidopsis (Arabidopsis thaliana). WRKY47 was expressed preferentially in senescing leaves. A subcellular localization assay indicated that WRKY47 was exclusively localized in nuclei. Overexpression of WRKY47 showed precocious leaf senescence, with less chlorophyll content and higher electrolyte leakage, but loss-of-function mutants of WRKY47 delayed this biological process. Through qRT-PCR and dual luciferase reporter assays, we found that WRKY47 could activate the expression of senescence-associated genes (SAGs) and PCD-associated genes to regulate leaf senescence. Furthermore, through electrophoretic mobility shift assay (EMSA) and chromatin immunoprecipitation (ChIP)-qPCR, WRKY47 was found to bind to W-box fragments in promoter regions of BFN1 (Bifunctional Nuclease 1) and MC6 (Metacaspase 6) directly. In general, our research revealed that WRKY47 regulates age-dependent leaf senescence by activating the transcription of two PCD-associated genes.
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Affiliation(s)
- Xing Cui
- State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, College of Life Science, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Xiaojiang Fan
- State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, College of Life Science, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Shutao Xu
- State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, College of Life Science, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Shuangshuang Wang
- State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, College of Life Science, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Fangfang Niu
- State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, College of Life Science, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Peiyu Zhao
- State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, College of Life Science, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Bo Yang
- State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, College of Life Science, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Wuzhen Liu
- State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, College of Life Science, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Xiaohua Guo
- State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, College of Life Science, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Yuan-Qing Jiang
- State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, College of Life Science, Northwest A&F University, Yangling, 712100, Shaanxi, China.
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2
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Lambert L, de Carpentier F, André P, Marchand CH, Danon A. Type II metacaspase mediates light-dependent programmed cell death in Chlamydomonas reinhardtii. PLANT PHYSIOLOGY 2024; 194:2648-2662. [PMID: 37971939 PMCID: PMC10980519 DOI: 10.1093/plphys/kiad618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 10/12/2023] [Accepted: 10/22/2023] [Indexed: 11/19/2023]
Abstract
Among the crucial processes that preside over the destiny of cells from any type of organism are those involving their self-destruction. This process is well characterized and conceptually logical to understand in multicellular organisms; however, the levels of knowledge and comprehension of its existence are still quite enigmatic in unicellular organisms. We use Chlamydomonas (Chlamydomonas reinhardtii) to lay the foundation for understanding the mechanisms of programmed cell death (PCD) in a unicellular photosynthetic organism. In this paper, we show that while PCD induces the death of a proportion of cells, it allows the survival of the remaining population. A quantitative proteomic analysis aiming at unveiling the proteome of PCD in Chlamydomonas allowed us to identify key proteins that led to the discovery of essential mechanisms. We show that in Chlamydomonas, PCD relies on the light dependence of a photosynthetic organism to generate reactive oxygen species and induce cell death. Finally, we obtained and characterized mutants for the 2 metacaspase genes in Chlamydomonas and showed that a type II metacaspase is essential for PCD execution.
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Affiliation(s)
- Lou Lambert
- Institut de Biologie Paris Seine, UMR 7238, CNRS, Sorbonne Université, Paris 75005, France
| | - Félix de Carpentier
- Institut de Biologie Paris Seine, UMR 7238, CNRS, Sorbonne Université, Paris 75005, France
- Doctoral School of Plant Sciences, Université Paris-Saclay, Saint-Aubin 91190, France
| | - Phuc André
- Institut de Biologie Paris Seine, UMR 7238, CNRS, Sorbonne Université, Paris 75005, France
| | - Christophe H Marchand
- Institut de Biologie Paris Seine, UMR 7238, CNRS, Sorbonne Université, Paris 75005, France
- Institut de Biologie Physico-Chimique, Centre National de la Recherche Scientifique (CNRS), Paris F-75005, France
| | - Antoine Danon
- Institut de Biologie Paris Seine, UMR 7238, CNRS, Sorbonne Université, Paris 75005, France
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Deng H, Cao S, Zhang G, Xiao Y, Liu X, Wang F, Tang W, Lu X. OsVPE2, a Member of Vacuolar Processing Enzyme Family, Decreases Chilling Tolerance of Rice. RICE (NEW YORK, N.Y.) 2024; 17:5. [PMID: 38194166 PMCID: PMC10776553 DOI: 10.1186/s12284-023-00682-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Accepted: 12/29/2023] [Indexed: 01/10/2024]
Abstract
Chilling is a major abiotic stress affecting rice growth, development and geographical distribution. Plant vacuolar processing enzymes (VPEs) contribute to the seed storage protein processing and mediate the programmed cell death by abiotic and biotic stresses. However, little is known about the roles of plant VPEs in cold stress responses and tolerance regulation. Here, we found that OsVPE2 was a chilling-responsive gene. The early-indica rice variety Xiangzaoxian31 overexpressing OsVPE2 was more sensitive to chilling stress, whereas the OsVPE2-knockout mutants generated by the CRISPR-Cas9 technology exhibited significantly enhanced chilling tolerance at the seedling stage without causing yield loss. Deficiency of OsVPE2 reduces relative electrolyte leakage, accumulation of toxic compounds such as reactive oxygen species and malondialdehyde, and promotes antioxidant enzyme activities under chilling stress conditions. It was indicated that OsVPE2 mediated the disintegration of vacuoles under chilling stress, accompanied by the entry of swollen mitochondria into vacuoles. OsVPE2 suppressed the expression of genes that have a positive regulatory role in antioxidant process. Moreover, haplotype analysis suggested that the natural variation in the OsVPE2 non-coding region may endow OsVPE2 with different expression levels, thereby probably conferring differences in cold tolerance between japonica and indica sub-population. Our results thus reveal a new biological function of the VPE family in regulating cold resistance, and suggest that the gene editing or natural variations of OsVPE2 can be used to create cold tolerant rice varieties with stable yield.
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Affiliation(s)
- Huabing Deng
- College of Agronomy, Hunan Agricultural University, Changsha, 410128, China
- Yuelushan Laboratory, Changsha, 410128, China
| | - Sai Cao
- College of Agronomy, Hunan Agricultural University, Changsha, 410128, China
- Yuelushan Laboratory, Changsha, 410128, China
| | - Guilian Zhang
- College of Agronomy, Hunan Agricultural University, Changsha, 410128, China
- Yuelushan Laboratory, Changsha, 410128, China
| | - Yunhua Xiao
- College of Agronomy, Hunan Agricultural University, Changsha, 410128, China
- Yuelushan Laboratory, Changsha, 410128, China
| | - Xiong Liu
- College of Agronomy, Hunan Agricultural University, Changsha, 410128, China
- Yuelushan Laboratory, Changsha, 410128, China
| | - Feng Wang
- College of Agronomy, Hunan Agricultural University, Changsha, 410128, China
- Yuelushan Laboratory, Changsha, 410128, China
| | - Wenbang Tang
- State Key Laboratory of Hybrid Rice, Hunan Hybrid Rice Research Center, Hunan Academy of Agricultural Sciences, Changsha, 410125, China.
- Yuelushan Laboratory, Changsha, 410128, China.
| | - Xuedan Lu
- College of Agronomy, Hunan Agricultural University, Changsha, 410128, China.
- Yuelushan Laboratory, Changsha, 410128, China.
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Šoln K, Žnidaršič N, Klemenčič M, Koce JD. Fallopia japonica and Fallopia × bohemica extracts cause ultrastructural and biochemical changes in root tips of radish seedlings. PHYSIOLOGIA PLANTARUM 2023; 175:e14032. [PMID: 37882300 DOI: 10.1111/ppl.14032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 08/25/2023] [Accepted: 09/06/2023] [Indexed: 10/27/2023]
Abstract
Japanese knotweed (Fallopia japonica) and Bohemian knotweed (Fallopia × bohemica) are invasive plants that use allelopathy as an additional mechanism for colonization of the new habitat. Allelochemicals affect the growth of roots of neighboring plants. In the present study, we analyze the early changes associated with the inhibited root growth of radish seedlings exposed to aqueous extracts of knotweed rhizomes for 3 days. Here, we show that cells in the root cap treated with the knotweed extracts exhibited reduced cell length and displayed several ultrastructural changes, including the increased abundance of dilated ER cisternae filled with electron-dense material (ER bodies) and the accumulation of dense inclusions. Moreover, mitochondrial damage was exhibited in the root cap and the meristem zone compared to the non-treated radish seedlings. Furthermore, malfunction of the intracellular redox balance system was detected as the increased total antioxidative capacity. We also detected increased metacaspase-like proteolytic activities and, in the case of 10% extract of F. japonica, increased caspase-like proteolytic activities. These ultrastructural and biochemical effects could be the reason for the more than 60% shorter root length of treated radish seedlings compared to controls.
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Affiliation(s)
- Katarina Šoln
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
- Department of Biodiversity, Faculty of Mathematics, Natural Sciences and Information Technologies, University of Primorska, Koper, Slovenia
| | - Nada Žnidaršič
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Marina Klemenčič
- Department of Chemistry and Biochemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, Ljubljana, Slovenia
| | - Jasna Dolenc Koce
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
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5
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Huai B, Liang M, Lin J, Tong P, Bai M, He H, Liang X, Chen J, Wu H. Involvement of Vacuolar Processing Enzyme CgVPE1 in Vacuole Rupture in the Programmed Cell Death during the Development of the Secretory Cavity in Citrus grandis 'Tomentosa' Fruits. Int J Mol Sci 2023; 24:11681. [PMID: 37511439 PMCID: PMC10380461 DOI: 10.3390/ijms241411681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 07/06/2023] [Accepted: 07/17/2023] [Indexed: 07/30/2023] Open
Abstract
Vacuolar processing enzymes (VPEs) with caspase-1-like activity are closely associated with vacuole rupture. The destruction of vacuoles is one of the characteristics of programmed cell death (PCD) in plants. However, whether VPE is involved in the vacuole destruction of cells during secretory cavity formation in Citrus plants remains unclear. This research identified a CgVPE1 gene that encoded the VPE and utilized cytology and molecular biology techniques to explore its temporal and spatial expression characteristics during the PCD process of secretory cavity cells in the Citrus grandis 'Tomentosa' fruit. The results showed that CgVPE1 is an enzyme with VPE and caspase-1-like activity that can self-cleave into a mature enzyme in an acidic environment. CgVPE1 is specifically expressed in the epithelial cells of secretory cavities. In addition, it mainly accumulates in vacuoles before it is ruptured in the secretory cavity cells. The spatial and temporal immunolocalization of CgVPE1 showed a strong relationship with the change in vacuole structure during PCD in secretory cavity cells. In addition, the change in the two types of VPE proteins from proenzymes to mature enzymes was closely related to the change in CgVPE1 localization. Our results indicate that CgVPE1 plays a vital role in PCD, causing vacuole rupture in cells during the development of the secretory cavity in C. grandis 'Tomentosa' fruits.
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Affiliation(s)
- Bin Huai
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou 510642, China
| | - Minjian Liang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou 510642, China
| | - Junjun Lin
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou 510642, China
| | - Panpan Tong
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou 510642, China
| | - Mei Bai
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou 510642, China
- Guangdong Technology Research Center for Traditional Chinese Veterinary Medicine and Natural Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Hanjun He
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou 510642, China
- Guangdong Technology Research Center for Traditional Chinese Veterinary Medicine and Natural Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Xiangxiu Liang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou 510642, China
- Guangdong Technology Research Center for Traditional Chinese Veterinary Medicine and Natural Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Jiezhong Chen
- College of Horticulture, South China Agricultural University, Guangzhou 510642, China
| | - Hong Wu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou 510642, China
- Guangdong Technology Research Center for Traditional Chinese Veterinary Medicine and Natural Medicine, South China Agricultural University, Guangzhou 510642, China
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6
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Zakharova E, Khanina T, Knyazev A, Milyukova N, Kovaleva LV. Hormonal Signaling during dPCD: Cytokinin as the Determinant of RNase-Based Self-Incompatibility in Solanaceae. Biomolecules 2023; 13:1033. [PMID: 37509069 PMCID: PMC10377171 DOI: 10.3390/biom13071033] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 06/19/2023] [Accepted: 06/20/2023] [Indexed: 07/30/2023] Open
Abstract
Research into molecular mechanisms of self-incompatibility (SI) in plants can be observed in representatives of various families, including Solanaceae. Earlier studies of the mechanisms of S-RNase-based SI in petunia (Petunia hybrida E. Vilm.) demonstrate that programmed cell death (PCD) is an SI factor. These studies suggest that the phytohormon cytokinin (CK) is putative activator of caspase-like proteases (CLPs). In this work, data confirming this hypothesis were obtained in two model objects-petunia and tomato (six Solanaceae representatives). The exogenous zeatin treatment of tomato and petunia stigmas before a compatible pollination activates CLPs in the pollen tubes in vivo, as shown via the intravital imaging of CLP activities. CK at any concentration slows down the germination and growth of petunia and tomato male gametophytes both in vitro and in vivo; shifts the pH of the cytoplasm (PHc) to the acid region, thereby creating the optimal conditions for CLP to function and inhibiting the F-actin formation and/or destructing the cytoskeleton in pollen tubes to point foci during SI-induced PCD; and accumulates in style tissues during SI response. The activity of the ISOPENTENYLTRANSFERASE 5 (IPT5) gene at this moment exceeds its activity in a cross-compatible pollination, and the levels of expression of the CKX1 and CKX2 genes (CK OXIDASE/DEHYDROGENASE) are significantly lower in self-incompatible pollination. All this suggests that CK plays a decisive role in the mechanism underlying SI-induced PCD.
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Affiliation(s)
- Ekaterina Zakharova
- All-Russia Research Institute of Agricultural Biotechnology, 127550 Moscow, Russia
| | - Tatiana Khanina
- All-Russia Research Institute of Agricultural Biotechnology, 127550 Moscow, Russia
| | - Andrey Knyazev
- All-Russia Research Institute of Agricultural Biotechnology, 127550 Moscow, Russia
| | - Natalia Milyukova
- All-Russia Research Institute of Agricultural Biotechnology, 127550 Moscow, Russia
| | - Lidia V Kovaleva
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, 191186 Moscow, Russia
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7
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Liu Q, Zhao Y, Rahman S, She M, Zhang J, Yang R, Islam S, O'Hara G, Varshney RK, Liu H, Ma H, Ma W. The putative vacuolar processing enzyme gene TaVPE3cB is a candidate gene for wheat stem pith-thickness. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2023; 136:138. [PMID: 37233825 DOI: 10.1007/s00122-023-04372-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 04/27/2023] [Indexed: 05/27/2023]
Abstract
KEY MESSAGE The vacuolar processing enzyme gene TaVPE3cB is identified as a candidate gene for a QTL of wheat pith-thickness on chromosome 3B by BSR-seq and differential expression analyses. The high pith-thickness (PT) of the wheat stem could greatly enhance stem mechanical strength, especially the basal internodes which support the heavier upper part, such as upper stems, leaves and spikes. A QTL for PT in wheat was previously discovered on 3BL in a double haploid population of 'Westonia' × 'Kauz'. Here, a bulked segregant RNA-seq analysis was applied to identify candidate genes and develop associated SNP markers for PT. In this study, we aimed at screening differentially expressed genes (DEGs) and SNPs in the 3BL QTL interval. Sixteen DEGs were obtained based on BSR-seq and differential expression analyses. Twenty-four high-probability SNPs in eight genes were identified by comparing the allelic polymorphism in mRNA sequences between the high PT and low PT samples. Among them, six genes were confirmed to be associated with PT by qRT-PCR and sequencing. A putative vacuolar processing enzyme gene TaVPE3cB was screened out as a potential PT candidate gene in Australian wheat 'Westonia'. A robust SNP marker associated with TaVPE3cB was developed, which can assist in the introgression of TaVPE3cB.b in wheat breeding programs. In addition, we also discussed the function of other DEGs which may be related to pith development and programmed cell death (PCD). A five-level hierarchical regulation mechanism of stem pith PCD in wheat was proposed.
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Affiliation(s)
- Qier Liu
- Centre for Crop and Food Innovation, Food Futures Institute and College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, 6150, Australia
- Provincial Key Laboratory of Agrobiology, and Institute of Food Crops, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, People's Republic of China
| | - Yun Zhao
- Centre for Crop and Food Innovation, Food Futures Institute and College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, 6150, Australia
- Institute of Cereal and Oil Crops, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, 050035, People's Republic of China
| | - Shanjida Rahman
- Centre for Crop and Food Innovation, Food Futures Institute and College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, 6150, Australia
| | - Maoyun She
- Centre for Crop and Food Innovation, Food Futures Institute and College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, 6150, Australia
| | - Jingjuan Zhang
- Centre for Crop and Food Innovation, Food Futures Institute and College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, 6150, Australia
| | - Rongchang Yang
- Centre for Crop and Food Innovation, Food Futures Institute and College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, 6150, Australia
| | - Shahidul Islam
- Centre for Crop and Food Innovation, Food Futures Institute and College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, 6150, Australia
| | - Graham O'Hara
- Centre for Crop and Food Innovation, Food Futures Institute and College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, 6150, Australia
| | - Rajeev K Varshney
- Centre for Crop and Food Innovation, Food Futures Institute and College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, 6150, Australia
| | - Hang Liu
- Centre for Crop and Food Innovation, Food Futures Institute and College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, 6150, Australia
| | - Hongxiang Ma
- Provincial Key Laboratory of Agrobiology, and Institute of Food Crops, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, People's Republic of China
| | - Wujun Ma
- Centre for Crop and Food Innovation, Food Futures Institute and College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, 6150, Australia.
- College of Agronomy, Qingdao Agriculture University, Qingdao, 266109, People's Republic of China.
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8
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Chen Q, Yan J, Tong T, Zhao P, Wang S, Zhou N, Cui X, Dai M, Jiang YQ, Yang B. ANAC087 transcription factor positively regulates age-dependent leaf senescence through modulating the expression of multiple target genes in Arabidopsis. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2023; 65:967-984. [PMID: 36519581 DOI: 10.1111/jipb.13434] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Leaf senescence is the final stage of leaf development and appropriate onset and progression of leaf senescence are critical for reproductive success and fitness. Although great progress has been made in identifying key genes regulating leaf senescence and elucidating the underlining mechanisms in the model plant Arabidopsis, there is still a gap to understanding the complex regulatory network. In this study, we discovered that Arabidopsis ANAC087 transcription factor (TF) positively modulated leaf senescence. Expression of ANAC087 was induced in senescing leaves and the encoded protein acted as a transcriptional activator. Both constitutive and inducible overexpression lines of ANAC087 showed earlier senescence than control plants, whereas T-DNA insertion mutation and dominant repression of the ANAC087 delayed senescence rate. A quantitative reverse transcription-polymerase chain reaction (qRT-PCR) profiling showed that the expression of an array of senescence-associated genes was upregulated in inducible ANAC087 overexpression plants including BFN1, NYE1, CEP1, RbohD, SAG13, SAG15, and VPEs, which are involved in programmed cell death (PCD), chlorophyll degradation and reactive oxygen species (ROS) accumulation. In addition, electrophoretic mobility shift assay (EMSA) and chromatin immunoprecipitation-quantitative polymerase chain reaction (ChIP-qPCR) assays demonstrated that ANAC087 directly bound to the canonical NAC recognition sequence (NACRS) motif in promoters of its target genes. Moreover, mutation of two representative target genes, BFN1 or NYE1 alleviated the senescence rate of ANAC087-overexpression plants, suggesting their genetic regulatory relationship. Taken together, this study indicates that ANAC087 serves as an important regulator linking PCD, ROS, and chlorophyll degradation to leaf senescence.
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Affiliation(s)
- Qinqin Chen
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, 712100, China
| | - Jingli Yan
- College of Plant Protection, Henan Agricultural University, Zhengzhou, 450002, China
| | - Tiantian Tong
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, 712100, China
| | - Peiyu Zhao
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, 712100, China
| | - Shuangshuang Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, 712100, China
| | - Na Zhou
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, 712100, China
| | - Xing Cui
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, 712100, China
| | - Moyu Dai
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, 712100, China
| | - Yuan-Qing Jiang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, 712100, China
| | - Bo Yang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, 712100, China
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9
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Promoter Cis-Element Analyses Reveal the Function of αVPE in Drought Stress Response of Arabidopsis. BIOLOGY 2023; 12:biology12030430. [PMID: 36979122 PMCID: PMC10045073 DOI: 10.3390/biology12030430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 02/22/2023] [Accepted: 02/26/2023] [Indexed: 03/14/2023]
Abstract
Vacuolar processing enzyme (VPE) is a cysteine protease responsible for vacuolar proteins’ maturation and regulation of programmed cell death (PCD). Four isoforms of Arabidopsis thaliana VPEs were identified previously, but only the functions of βVPE, γVPE, and δVPE were determined. The specific function of a gene is linked to the cis-acting elements in the promoter region. A promoter analysis found repetitive drought-related cis-elements in αVPE, which highlight its potential involvement in drought regulation in A. thaliana. The further co-expression network portraying genes interacting with αVPE substantiated its drought-regulation-related function. Expression of αVPE was upregulated after drought treatment in A. thaliana. To confirm the role of αVPE, a loss of function study revealed that αVPE knockout mutants remained green compared with WT after drought treatment. The mutants had reduced proline activity, decreased sucrose content, and lower MDA content, but increased photosynthetic pigments, indicating that αVPE negatively regulates drought tolerance in A. thaliana. Taken together, our findings serve as important evidence of the involvement of αVPE in modulating drought tolerance in A. thaliana.
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10
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Banerjee N, Khan MS, Swapna M, Yadav S, Tiwari GJ, Jena SN, Patel JD, Manimekalai R, Kumar S, Dattamajuder SK, Kapur R, Koebernick JC, Singh RK. QTL mapping and identification of candidate genes linked to red rot resistance in sugarcane. 3 Biotech 2023; 13:82. [PMID: 36778768 PMCID: PMC9911584 DOI: 10.1007/s13205-023-03481-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Accepted: 01/13/2023] [Indexed: 02/12/2023] Open
Abstract
Sugarcane (Saccharum species hybrid) is one of the most important commercial crops cultivated worldwide for products like white sugar, bagasse, ethanol, etc. Red rot is a major sugarcane disease caused by a hemi-biotrophic fungus, Colletotrichum falcatum Went., which can potentially cause a reduction in yield up to 100%. Breeding for red rot-resistant sugarcane varieties has become cumbersome due to its complex genome and frequent generation of new pathotypes of red rot fungus. In the present study, a genetic linkage map was developed using a selfed population of a popular sugarcane variety CoS 96268. A QTL linked to red rot resistance (qREDROT) was identified, which explained 26% of the total phenotypic variation for the trait. A genotype-phenotype network analysis performed to account for epistatic interactions, identified the key markers involved in red rot resistance. The differential expression of the genes located in the genomic region between the two flanking markers of the qREDROT as well as in the vicinity of the markers identified through the genotype-phenotype network analysis in a set of contrasting genotypes for red rot infection further confirmed the mapping results. Further, the expression analysis revealed that the plant defense-related gene coding 26S protease regulatory subunit is strongly associated with the red rot resistance. The findings can help in the screening of disease resistant genotypes for developing red rot-resistant varieties of sugarcane. Supplementary Information The online version contains supplementary material available at 10.1007/s13205-023-03481-7.
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Affiliation(s)
- Nandita Banerjee
- ICAR-Indian Institute of Sugarcane Research, Raibareli Road, P.O. Dilkusha, Lucknow, 226002 India
| | - Mohammad Suhail Khan
- ICAR-Indian Institute of Sugarcane Research, Raibareli Road, P.O. Dilkusha, Lucknow, 226002 India
| | - M. Swapna
- ICAR-Indian Institute of Sugarcane Research, Raibareli Road, P.O. Dilkusha, Lucknow, 226002 India
| | - Sonia Yadav
- ICAR-Indian Institute of Sugarcane Research, Raibareli Road, P.O. Dilkusha, Lucknow, 226002 India
| | - Gopal Ji Tiwari
- Plant Molecular Biology Laboratory, CSIR-National Botanical Research Institute, Lucknow, 226001 India
| | - Satya N. Jena
- Plant Molecular Biology Laboratory, CSIR-National Botanical Research Institute, Lucknow, 226001 India
| | - Jinesh D. Patel
- Department of Crop, Soil and Environmental Sciences, Auburn University, Auburn, AL 36849 USA
| | - R. Manimekalai
- Biotechnology Lab, Sugarcane Breeding Institute, Coimbatore, 641007 India
| | - Sanjeev Kumar
- ICAR-Indian Institute of Sugarcane Research, Raibareli Road, P.O. Dilkusha, Lucknow, 226002 India
| | - S. K. Dattamajuder
- ICAR-Indian Institute of Sugarcane Research, Raibareli Road, P.O. Dilkusha, Lucknow, 226002 India
| | - Raman Kapur
- ICAR-Indian Institute of Sugarcane Research, Raibareli Road, P.O. Dilkusha, Lucknow, 226002 India
| | - Jenny C. Koebernick
- Department of Crop, Soil and Environmental Sciences, Auburn University, Auburn, AL 36849 USA
| | - Ram K. Singh
- ICAR-Indian Institute of Sugarcane Research, Raibareli Road, P.O. Dilkusha, Lucknow, 226002 India
- Present Address: Crop Science Division, Indian Council of Agricultural Research, Krishi Bhawan, New Delhi, 110001 India
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11
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Hemu X, Zhang X, Chang HY, Poh JE, Tam JP. Consensus design and engineering of an efficient and high-yield peptide asparaginyl ligase for protein cyclization and ligation. J Biol Chem 2023; 299:102997. [PMID: 36764523 PMCID: PMC10017362 DOI: 10.1016/j.jbc.2023.102997] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 02/06/2023] [Accepted: 02/07/2023] [Indexed: 02/11/2023] Open
Abstract
Plant legumains are Asn/Asp-specific endopeptidases that have diverse functions in plants. Peptide asparaginyl ligases (PALs) are a special legumain subtype that primarily catalyze peptide bond formation rather than hydrolysis. PALs are versatile protein engineering tools but are rarely found in nature. To overcome this limitation, here we describe a two-step method to design and engineer a high-yield and efficient recombinant PAL based on commonly found asparaginyl endopeptidases. We first constructed a consensus sequence derived from 1500 plant legumains to design the evolutionarily stable legumain conLEG that could be produced in E. coli with 20-fold higher yield relative to that for natural legumains. We then applied the ligase-activity determinant hypothesis to exploit conserved residues in PAL substrate-binding pockets and convert conLEG into conPAL1-3. Functional studies showed that conLEG is primarily a hydrolase, whereas conPALs are ligases. Importantly, conPAL3 is a superefficient and broadly active PAL for protein cyclization and ligation.
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Affiliation(s)
- Xinya Hemu
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore; School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Xiaohong Zhang
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Hong Yi Chang
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore; Department of Pharmacy, Singapore General Hospital, Singapore, Singapore
| | - Jin En Poh
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - James P Tam
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore.
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12
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Wleklik K, Borek S. Vacuolar Processing Enzymes in Plant Programmed Cell Death and Autophagy. Int J Mol Sci 2023; 24:ijms24021198. [PMID: 36674706 PMCID: PMC9862320 DOI: 10.3390/ijms24021198] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 01/02/2023] [Accepted: 01/05/2023] [Indexed: 01/11/2023] Open
Abstract
Vacuolar processing enzymes (VPEs) are plant cysteine proteases that are subjected to autoactivation in an acidic pH. It is presumed that VPEs, by activating other vacuolar hydrolases, are in control of tonoplast rupture during programmed cell death (PCD). Involvement of VPEs has been indicated in various types of plant PCD related to development, senescence, and environmental stress responses. Another pathway induced during such processes is autophagy, which leads to the degradation of cellular components and metabolite salvage, and it is presumed that VPEs may be involved in the degradation of autophagic bodies during plant autophagy. As both PCD and autophagy occur under similar conditions, research on the relationship between them is needed, and VPEs, as key vacuolar proteases, seem to be an important factor to consider. They may even constitute a potential point of crosstalk between cell death and autophagy in plant cells. This review describes new insights into the role of VPEs in plant PCD, with an emphasis on evidence and hypotheses on the interconnections between autophagy and cell death, and indicates several new research opportunities.
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13
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Xie Q, Yuan Z, Hou H, Zhao H, Chen H, Ni X. Effects of ROS and caspase-3-like protein on the growth and aerenchyma formation of Potamogeton perfoliatus stem. PROTOPLASMA 2023; 260:307-325. [PMID: 35689107 DOI: 10.1007/s00709-022-01780-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 05/27/2022] [Indexed: 06/15/2023]
Abstract
Aerenchyma formation plays an important role in the survival of Potamogeton perfoliatus in submerged environment. To understand the regulatory role of reactive oxygen species (ROS) and caspase 3-like protein signaling molecules in aerenchyma formation, we investigated the effects of exogenous NADPH oxidase inhibitor (diphenyleneiodonium chloride, DPI), catalase inhibitor (3-amino-1,2,4-triazole, AT), and caspase-3-like protein inhibitor (AC-DEVD-CHO, DEVD) on morphological and physiological characteristics and aerenchyma formation in P. perfoliatus. The results showed that after DPI treatment, caspase-3-like protein activity decreased, ROS-related enzyme activities increased, and H2O2 content decreased, thereby inhibiting aerenchyma formation. When the concentration of DPI was approximately 1 μmol/L, the inhibitory effect was the most obvious. On the contrary, after the AT treatment, caspase-3-like protein activity increased, ROS-related enzyme activities decreased, and the H2O2 content increased, ultimately promoting aerenchyma formation, and the promotion was the most obvious under treatment with approximately 500 μmol/L AT. After DEVD treatment, the inhibition of vegetative growth caused by DPI or AT treatment was alleviated, significantly reducing caspase-3-like activity and inhibiting aerenchyma development. The results of this study show that ROS has a positive regulatory effect on aerenchyma formation, and caspase-3-like protein is activated to promote ROS-mediated aerenchyma formation. This experiment provides a new theoretical basis for further exploration of the signal transduction effects of ROS and caspase-3-like protein in plant cells and their roles in plant development.
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Affiliation(s)
- Qinmi Xie
- Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration of North-Western China, Ningxia University, Yinchuan, 750000, China
- Key Lab for Restoration and Reconstruction of Degraded Ecosystem in North-Western China (Ministry of Education), School of Ecology and Environment, Ningxia University, Yinchuan, 750000, China
| | - Zhongxun Yuan
- Key Laboratory of Eco-Environments in Three Gorges Reservoir Region (Ministry of Education), Southwest University, Chongqing, 400715, China
- Chongqing Key Laboratory of Plant Resource Conservation and Germplasm Innovation, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Hui Hou
- Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration of North-Western China, Ningxia University, Yinchuan, 750000, China
- Key Lab for Restoration and Reconstruction of Degraded Ecosystem in North-Western China (Ministry of Education), School of Ecology and Environment, Ningxia University, Yinchuan, 750000, China
| | - Hongliang Zhao
- School of Agriculture, Ningxia University, Yinchuan, 750000, China
| | - Hao Chen
- School of Agriculture, Ningxia University, Yinchuan, 750000, China
| | - Xilu Ni
- Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration of North-Western China, Ningxia University, Yinchuan, 750000, China.
- Key Lab for Restoration and Reconstruction of Degraded Ecosystem in North-Western China (Ministry of Education), School of Ecology and Environment, Ningxia University, Yinchuan, 750000, China.
- Ningxia Helan Mountain Forest Ecosystem Research Station, State Forestry Administration, Yinchuan, 750000, China.
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14
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Ramakrishnan M, Arivalagan J, Satish L, Mohan M, Samuel Selvan Christyraj JR, Chandran SA, Ju HJ, John L A, Ramesh T, Ignacimuthu S, Kalishwaralal K. Selenium: a potent regulator of ferroptosis and biomass production. CHEMOSPHERE 2022; 306:135531. [PMID: 35780987 DOI: 10.1016/j.chemosphere.2022.135531] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 06/01/2022] [Accepted: 06/25/2022] [Indexed: 06/15/2023]
Abstract
Emerging evidence supports the notion that selenium (Se) plays a beneficial role in plant development for modern crop production and is considered an essential micronutrient and the predominant source of plants. However, the essential role of selenium in plant metabolism remains unclear. When used in moderate concentrations, selenium promotes plant physiological processes such as enhancing plant growth, increasing antioxidant capacity, reducing reactive oxygen species and lipid peroxidation and offering stress resistance by preventing ferroptosis cell death. Ferroptosis, a recently discovered mechanism of regulated cell death (RCD) with unique features such as iron-dependant accumulation of lipid peroxides, is distinctly different from other known forms of cell death. Glutathione peroxidase (GPX) activity plays a significant role in scavenging the toxic by-products of lipid peroxidation in plants. A low level of GPX activity in plants causes high oxidative stress, which leads to ferroptosis. An integrated view of ferroptosis and selenium in plants and the selenium-mediated nanofertilizers (SeNPs) have been discussed in more recent studies. For instance, selenium supplementation enhanced GPX4 expression and increased TFH cell (Follicular helper T) numbers and the gene transcriptional program, which prevent lipid peroxidase and protect cells from ferroptosis. However, though ferroptosis in plants is similar to that in animals, only few studies have focused on plant-specific ferroptosis; the research on ferroptosis in plants is still in its infancy. Understanding the implication of selenium with relevance to ferroptosis is indispensable for plant bioresource technology. In this review, we hypothesize that blocking ferroptosis cell death improves plant immunity and protects plants from abiotic and biotic stresses. We also examine how SeNPs can be the basis for emerging unconventional and advanced technologies for algae/bamboo biomass production. For instance, algae treated with SeNPs accumulate high lipid profile in algal cells that could thence be used for biodiesel production. We also suggest that further studies in the field of SeNPs are essential for the successful application of this technology for the large-scale production of plant biomass.
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Affiliation(s)
- Muthusamy Ramakrishnan
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, Jiangsu, China; Bamboo Research Institute, Nanjing Forestry University, Nanjing 210037, Jiangsu, China
| | - Jaison Arivalagan
- Department of Chemistry, Molecular Biosciences and Proteomics Center of Excellence, Northwestern University, Evanston, IL, 60208, USA
| | - Lakkakula Satish
- Department of Biotechnology Engineering, & The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Applied Phycology and Biotechnology Division, Marine Algal Research Station, CSIR - Central Salt and Marine Chemicals Research Institute, Mandapam 623519, Tamil Nadu, India
| | - Manikandan Mohan
- College of Pharmacy, University of Georgia, Athens, GA, USA; VAXIGEN International Research Center Private Limited, India
| | - Johnson Retnaraj Samuel Selvan Christyraj
- Regeneration and Stem Cell Biology Lab, Centre for Molecular and Nanomedical Sciences, International Research Centre, Sathyabama Institute of Science and Technology, Chennai, 600119, Tamilnadu, India
| | - Sam Aldrin Chandran
- School of Chemical and Biotechnology, SASTRA University, Thanjavur, 613 401 India
| | - Ho-Jong Ju
- Department of Agricultural Biology, College of Agriculture & Life Sciences, Jeonbuk National University, Jeonju-si, 54896, Republic of Korea
| | - Anoopa John L
- The Dale View College of Pharmacy and Research Centre, Thiruvananthapuram, Kerala, India
| | - Thiyagarajan Ramesh
- Deapartment of Basic Medical Sciences, College of Medicine, Prince Sattam Bin Abdulaziz University,P.O.Box:173, AI-Kharaj 11942,Saudi Arabia
| | | | - Kalimuthu Kalishwaralal
- Division of Cancer Research, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, 695014, Kerala, India.
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15
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Huai B, Liang MJ, Bai M, He HJ, Chen JZ, Wu H. Localization of CgVPE1 in secondary cell wall formation during tracheary element differentiation in the pericarp of Citrus grandis 'Tomentosa' fruits. PLANTA 2022; 256:89. [PMID: 36169724 DOI: 10.1007/s00425-022-04001-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Accepted: 09/19/2022] [Indexed: 06/16/2023]
Abstract
CgVPE1 is important in the differentiation of TE cells in C. grandis 'Tomentosa' fruits as it may directly affects secondary cell wall construction while participating in PCD. The vacuolar processing enzyme (VPE) plays an important role in both developmental and environmentally inducible programmed cell death (PCD); it was originally identified as a cysteine protease localized in the vacuole to activate and mature vacuolar proteins in plants. Interestingly, we found a VPE called CgVPE1 to be associated with deposition of the secondary cell wall in tracheary element (TE) cells in the pericarp of Citrus grandis 'Tomentosa' fruits. We then used ultrathin sections and the TUNEL assay to verify that PCD is involved in TE development. Furthermore, CgVPE1 was found to be mainly expressed in secretory cavities and TEs in the pericarp of Citrus grandis 'Tomentosa' fruits. Immunolocalization of CgVPE1 in the pericarp indicated that CgVPE1 is mainly distributed in the central large vacuole, endoplasmic reticulum, Golgi vesicles, cytosol, and secondary wall before TE maturation. CgVPE1 appeared earlier in the endoplasmic reticulum and Golgi vesicles of TEs cells. The vesicles containing CgVPE1 near the large central vacuole and secondary wall were observed, respectively. CgVPE1 proteins content in the cytoplasm decreased sharply, while the CgVPE1 content in the secondary cell wall did not change significantly after vacuole rupture. CgVPE1 protein contents in the secondary cell wall were significantly reduced until the TE cells developed into hollow thick-walled cells. Furthermore, labeling of VPE homologues in Arabidopsis thaliana using immunoelectron microscopy with anti-CgVPE1 antibody revealed that VPE homologues were specifically distributed in the secondary cell wall of stem TEs. Overall, these results suggested that CgVPE1 is not only involved PCD during TE cell development; furthermore, it may directly participate in the construction of plant secondary cell walls.
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Affiliation(s)
- B Huai
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China
| | - M J Liang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China
| | - M Bai
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China
- Guangdong Technology Research Center for Traditional Chinese Veterinary Medicine and Natural Medicine, South China Agricultural University, Guangzhou, 510642, China
| | - H J He
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China
- Guangdong Technology Research Center for Traditional Chinese Veterinary Medicine and Natural Medicine, South China Agricultural University, Guangzhou, 510642, China
| | - J Z Chen
- College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
| | - H Wu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, 510642, China.
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China.
- Guangdong Technology Research Center for Traditional Chinese Veterinary Medicine and Natural Medicine, South China Agricultural University, Guangzhou, 510642, China.
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16
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Roles of Species-Specific Legumains in Pathogenicity of the Pinewood Nematode Bursaphelenchus xylophilus. Int J Mol Sci 2022; 23:ijms231810437. [PMID: 36142347 PMCID: PMC9499627 DOI: 10.3390/ijms231810437] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 08/24/2022] [Accepted: 08/31/2022] [Indexed: 11/16/2022] Open
Abstract
Peptidases are very important to parasites, which have central roles in parasite biology and pathogenesis. In this study, by comparative genome analysis, genome-wide peptidase diversities among plant-parasitic nematodes are estimated. We find that genes encoding cysteine peptidases in family C13 (legumain) are significantly abundant in pine wood nematodes Bursaphelenchus genomes, compared to those in other plant-parasitic nematodes. By phylogenetic analysis, a clade of B. xylophilus-specific legumain is identified. RT-qPCR detection shows that these genes are highly expressed at early stage during the nematode infection process. Utilizing transgene technology, cDNAs of three species-specific legumain were introduced into the Arabidopsis γvpe mutant. Functional complementation assay shows that these B. xylophilus legumains can fully complement the activity of Arabidopsis γVPE to mediate plant cell death triggered by the fungal toxin FB1. Secretory activities of these legumains are experimentally validated. By comparative transcriptome analysis, genes involved in plant cell death mediated by legumains are identified, which enrich in GO terms related to ubiquitin protein transferase activity in category molecular function, and response to stimuli in category biological process. Our results suggest that B. xylophilu-specific legumains have potential as effectors to be involved in nematode-plant interaction and can be related to host cell death.
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17
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Cominelli E, Sparvoli F, Lisciani S, Forti C, Camilli E, Ferrari M, Le Donne C, Marconi S, Juan Vorster B, Botha AM, Marais D, Losa A, Sala T, Reboul E, Alvarado-Ramos K, Waswa B, Ekesa B, Aragão F, Kunert K. Antinutritional factors, nutritional improvement, and future food use of common beans: A perspective. FRONTIERS IN PLANT SCIENCE 2022; 13:992169. [PMID: 36082303 PMCID: PMC9445668 DOI: 10.3389/fpls.2022.992169] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 08/02/2022] [Indexed: 06/06/2023]
Abstract
Common bean seeds are an excellent source of protein as well as of carbohydrates, minerals, vitamins, and bioactive compounds reducing, when in the diet, the risks of diseases. The presence of bioactive compounds with antinutritional properties (e.g., phytic acid, lectins, raffinosaccharides, protease inhibitors) limits, however, the bean's nutritional value and its wider use in food preparations. In the last decades, concerted efforts have been, therefore, made to develop new common bean genotypes with reduced antinutritional compounds by exploiting the natural genetic variability of common bean and also applying induced mutagenesis. However, possible negative, or positive, pleiotropic effects due to these modifications, in terms of plant performance in response to stresses or in the resulting technological properties of the developed mutant genotypes, have yet not been thoroughly investigated. The purpose of the perspective paper is to first highlight the current advances, which have been already made in mutant bean characterization. A view will be further provided on future research directions to specifically explore further advantages and disadvantages of these bean mutants, their potential use in innovative foods and representing a valuable genetic reservoir of combinations to assess the true functional role of specific seed bioactive components directly in the food matrix.
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Affiliation(s)
- Eleonora Cominelli
- National Research Council, Institute of Agricultural Biology and Biotechnology, Milan, Italy
| | - Francesca Sparvoli
- National Research Council, Institute of Agricultural Biology and Biotechnology, Milan, Italy
| | - Silvia Lisciani
- Council for Agricultural Research and Economics, Research Centre for Food and Nutrition, Rome, Italy
| | - Chiara Forti
- National Research Council, Institute of Agricultural Biology and Biotechnology, Milan, Italy
| | - Emanuela Camilli
- Council for Agricultural Research and Economics, Research Centre for Food and Nutrition, Rome, Italy
| | - Marika Ferrari
- Council for Agricultural Research and Economics, Research Centre for Food and Nutrition, Rome, Italy
| | - Cinzia Le Donne
- Council for Agricultural Research and Economics, Research Centre for Food and Nutrition, Rome, Italy
| | - Stefania Marconi
- Council for Agricultural Research and Economics, Research Centre for Food and Nutrition, Rome, Italy
| | - Barend Juan Vorster
- Department Plant and Soil Sciences, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
| | - Anna-Maria Botha
- Department of Genetics, Stellenbosch University, Stellenbosch, South Africa
| | - Diana Marais
- Department Plant and Soil Sciences, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
| | - Alessia Losa
- Council for Research in Agriculture and Economics, Research Centre for Genomics and Bioinformatics, Montanaso Lombardo, Italy
| | - Tea Sala
- Council for Research in Agriculture and Economics, Research Centre for Genomics and Bioinformatics, Montanaso Lombardo, Italy
| | | | | | - Boaz Waswa
- International Center for Tropical Agriculture (CIAT), CIAT Regional Office for Africa, Nairobi, Kenya
| | - Beatrice Ekesa
- International Center for Tropical Agriculture (CIAT), CIAT Regional Office for Africa, Nairobi, Kenya
| | | | - Karl Kunert
- Department Plant and Soil Sciences, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
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18
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Singh AA, Pillay P, Naicker P, Alexandre K, Malatji K, Mach L, Steinkellner H, Vorster J, Chikwamba R, Tsekoa TL. Transient proteolysis reduction of Nicotiana benthamiana-produced CAP256 broadly neutralizing antibodies using CRISPR/Cas9. FRONTIERS IN PLANT SCIENCE 2022; 13:953654. [PMID: 36061808 PMCID: PMC9433777 DOI: 10.3389/fpls.2022.953654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Accepted: 07/11/2022] [Indexed: 06/15/2023]
Abstract
The hypersensitive response is elicited by Agrobacterium infiltration of Nicotiana benthamiana, including the induction and accumulation of pathogenesis-related proteins, such as proteases. This includes the induction of the expression of several cysteine proteases from the C1 (papain-like cysteine protease) and C13 (legumain-like cysteine protease) families. This study demonstrates the role of cysteine proteases: NbVPE-1a, NbVPE-1b, and NbCysP6 in the proteolytic degradation of Nicotiana benthamiana (glycosylation mutant ΔXTFT)-produced anti-human immunodeficiency virus broadly neutralizing antibody, CAP256-VRC26.25. Three putative cysteine protease cleavage sites were identified in the fragment crystallizable region. We further demonstrate the transient coexpression of CAP256-VRC26.25 with CRISPR/Cas9-mediated genome editing vectors targeting the NbVPE-1a, NbVPE-1b, and NbCysP6 genes which resulted in a decrease in CAP256-VRC26.25 degradation. No differences in structural features were observed between the human embryonic kidney 293 (HEK293)-produced and ΔXTFT broadly neutralizing antibodies produced with and without the coexpression of genome-editing vectors. Furthermore, despite the presence of proteolytically degraded fragments of plant-produced CAP256-VRC26.25 without the coexpression of genome editing vectors, no influence on the in vitro functional activity was detected. Collectively, we demonstrate an innovative in planta strategy for improving the quality of the CAP256 antibodies through the transient expression of the CRISPR/Cas9 vectors.
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Affiliation(s)
- Advaita Acarya Singh
- Future Production: Chemicals Cluster, Council for Scientific and Industrial Research, Pretoria, South Africa
- Department of Plant and Soil Sciences, University of Pretoria, Pretoria, South Africa
| | - Priyen Pillay
- Future Production: Chemicals Cluster, Council for Scientific and Industrial Research, Pretoria, South Africa
| | - Previn Naicker
- NextGen Health Cluster, Council for Scientific and Industrial Research, Pretoria, South Africa
| | - Kabamba Alexandre
- NextGen Health Cluster, Council for Scientific and Industrial Research, Pretoria, South Africa
| | - Kanyane Malatji
- NextGen Health Cluster, Council for Scientific and Industrial Research, Pretoria, South Africa
| | - Lukas Mach
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Herta Steinkellner
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Juan Vorster
- Department of Plant and Soil Sciences, University of Pretoria, Pretoria, South Africa
| | - Rachel Chikwamba
- Future Production: Chemicals Cluster, Council for Scientific and Industrial Research, Pretoria, South Africa
| | - Tsepo L. Tsekoa
- Future Production: Chemicals Cluster, Council for Scientific and Industrial Research, Pretoria, South Africa
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19
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Cyclopaldic Acid, the Main Phytotoxic Metabolite of Diplodia cupressi, Induces Programmed Cell Death and Autophagy in Arabidopsis thaliana. Toxins (Basel) 2022; 14:toxins14070474. [PMID: 35878212 PMCID: PMC9325063 DOI: 10.3390/toxins14070474] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 06/30/2022] [Accepted: 07/07/2022] [Indexed: 01/12/2023] Open
Abstract
Cyclopaldic acid is one of the main phytotoxic metabolites produced by fungal pathogens of the genus Seiridium, causal agents, among others, of the canker disease of plants of the Cupressaceae family. Previous studies showed that the metabolite can partially reproduce the symptoms of the infection and that it is toxic to different plant species, thereby proving to be a non-specific phytotoxin. Despite the remarkable biological effects of the compound, which revealed also insecticidal, fungicidal and herbicidal properties, information about its mode of action is still lacking. In this study, we investigated the effects of cyclopaldic acid in Arabidopsis thaliana plants and protoplasts, in order to get information about subcellular targets and mechanism of action. Results of biochemical assays showed that cyclopaldic acid induced leaf chlorosis, ion leakage, membrane-lipid peroxidation, hydrogen peroxide production, inhibited root proton extrusion in vivo and plasma membrane H+-ATPase activity in vitro. qRT-PCR experiments demonstrated that the toxin elicited the transcription of key regulators of the immune response to necrotrophic fungi, of hormone biosynthesis, as well as of genes involved in senescence and programmed cell death. Confocal microscopy analysis of protoplasts allowed to address the question of subcellular targets of the toxin. Cyclopaldic acid targeted the plasma membrane H+-ATPase, inducing depolarization of the transmembrane potential, mitochondria, disrupting the mitochondrial network and eliciting overproduction of reactive oxygen species, and vacuole, determining tonoplast disgregation and induction of vacuole-mediated programmed cell death and autophagy.
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20
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Dong C, Li R, Wang N, Liu Y, Zhang Y, Bai S. Apple vacuolar processing enzyme 4 is regulated by cysteine protease inhibitor and modulates fruit disease resistance. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:3758-3773. [PMID: 35259265 DOI: 10.1093/jxb/erac093] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 03/04/2022] [Indexed: 06/14/2023]
Abstract
Ring rot is a destructive apple disease caused by Botryosphaeria dothidea. The resistance mechanism of apple plants to B. dothidea remains unclear. Here, we show that APPLE VACUOLAR PROCESSING ENZYME 4 (MdVPE4) is involved in resistance to B. dothidea. MdVPE4 silencing reduced fruit disease resistance, whereas its overexpression improved resistance. Gene expression analysis revealed that MdVPE4 influenced the expression of fruit disease resistance-related genes, such as APPLE POLYGALACTURONASE 1 (MdPG1), APPLE POLYGALACTURONASE INHIBITOR PROTEIN 1 (MdPGIP1), APPLE ENDOCHITINASE 1 (MdCHI1), and APPLE THAUMATIN-LIKE PROTEIN 1 (MdTHA1). The expression of the four genes responding to B. dothidea infection decreased in MdVPE4-silenced fruits. Further analysis demonstrated that B. dothidea infection induced MdVPE4 expression and enzyme activation in apple fruits. Moreover, MdVPE4 activity was modulated by apple cysteine proteinase inhibitor 1 (MdCPI1), which also contributed to resistance towards B. dothidea, as revealed by gene overexpression and silencing analysis. MdCPI1 interacted with MdVPE4 and inhibited its activity. However, MdCPI1 expression was decreased by B. dothidea infection. Taken together, our findings indicate that the interaction between MdVPE4 and MdCPI1 plays an important role in modulating fruit disease resistance to B. dothidea.
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Affiliation(s)
- Chaohua Dong
- College of Life Sciences, Qingdao Agricultural University, Qingdao, China
| | - Ronghui Li
- College of Life Sciences, Qingdao Agricultural University, Qingdao, China
| | - Nan Wang
- College of Life Sciences, Qingdao Agricultural University, Qingdao, China
| | - Yingshuang Liu
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
| | - Yugang Zhang
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
| | - Suhua Bai
- College of Life Sciences, Qingdao Agricultural University, Qingdao, China
- Key Laboratory of Plant Biotechnology of Shandong Province, Qingdao, China
- Shandong Province Key Laboratory of Applied Mycology, Qingdao, China
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Gong P, Kang J, Sadeghnezhad E, Bao R, Ge M, Zhuge Y, Shangguan L, Fang J. Transcriptional Profiling of Resistant and Susceptible Cultivars of Grapevine ( Vitis L.) Reveals Hypersensitive Responses to Plasmopara viticola. Front Microbiol 2022; 13:846504. [PMID: 35572700 PMCID: PMC9097084 DOI: 10.3389/fmicb.2022.846504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Accepted: 03/24/2022] [Indexed: 11/13/2022] Open
Abstract
Grapevine downy mildew is the most serious disease of grapevine cultivars that affects the rate of resistance/susceptibility to Plasmopara viticola. In this study, we used the susceptible cultivar "Zitian Seedless" and the resistant cultivar "Kober 5BB" as materials to determine the transcriptome differences and phenotypes of the leaves after inoculation with downy mildew. The differences in microstructures and molecular levels were compared and analyzed. Fluorescence staining and microscopic observations confirmed that hypersensitive cell death occurred around the stomata in "Kober 5BB" infected by downy mildew zoospores. Meanwhile, transcriptomic profiling indicated that there were 11,713 and 6,997 gene expression differences between the resistant and susceptible cultivars at 72 h after inoculation when compared to control (0 h), respectively. The differentially expressed genes of the two cultivars are significantly enriched in different pathways, including response to plant-pathogen interaction, mitogen-activated protein kinase (MAPK) signaling pathway, plant hormone signal transduction, phenylpropanoid, and flavonoid biosynthesis. Furthermore, the results of functional enrichment analysis showed that H2O2 metabolism, cell death, reactive oxygen response, and carbohydrate metabolism are also involved in the defense response of "Kober 5BB," wherein a total of 322 key genes have been identified. The protein interaction network showed that metacaspases (MCAs), vacuolar processing enzymes (VPEs), and Papain-like cysteine proteases (PLCPs) play an important role in the execution of hypersensitive responses (HR). In conclusion, we demonstrated that HR cell death is the key strategy in the process of grape defense against downy mildew, which may be mediated or activated by Caspase-like proteases.
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Affiliation(s)
- Peijie Gong
- Department of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Jun Kang
- Department of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Ehsan Sadeghnezhad
- Department of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Ruoxuan Bao
- Department of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Mengqing Ge
- Department of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Yaxian Zhuge
- Department of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Lingfei Shangguan
- Department of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Jinggui Fang
- Department of Horticulture, Nanjing Agricultural University, Nanjing, China
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22
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Guo X, Li L, Liu X, Zhang C, Yao X, Xun Z, Zhao Z, Yan W, Zou Y, Liu D, Li H, Lu H. MYB2 Is Important for Tapetal PCD and Pollen Development by Directly Activating Protease Expression in Arabidopsis. Int J Mol Sci 2022; 23:ijms23073563. [PMID: 35408924 PMCID: PMC8998314 DOI: 10.3390/ijms23073563] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 03/16/2022] [Accepted: 03/22/2022] [Indexed: 12/11/2022] Open
Abstract
Tapetal programmed cell death (PCD) is a complex biological process that plays an important role in pollen formation and reproduction. Here, we identified the MYB2 transcription factor expressed in the tapetum from stage 5 to stage 11 that was essential for tapetal PCD and pollen development in Arabidopsis thaliana. Downregulation of MYB2 retarded tapetal degeneration, produced defective pollen, and decreased pollen vitality. EMSA and transcriptional activation analysis revealed that MYB2 acted as an upstream activator and directly regulated expression of the proteases CEP1 and βVPE. The expression of these proteases was lower in the buds of the myb2 mutant. Overexpression of either/both CEP1 or/and βVPE proteases partially recover pollen vitality in the myb2 background. Taken together, our results revealed that MYB2 regulates tapetal PCD and pollen development by directly activating expression of the proteases CEP1 and βVPE. Thus, a transcription factor/proteases regulatory and activated cascade was established for tapetal PCD during another development in Arabidopsis thaliana. Highlight: MYB2 is involved in tapetal PCD and pollen development by directly regulating expression of the protease CEP1 and βVPE and establishes a transcription factor/proteases regulatory and activated cascade.
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Affiliation(s)
- Xiaorui Guo
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing 100083, China; (X.G.); (H.L.)
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China;
| | - Lihong Li
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Xiatong Liu
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Chong Zhang
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Xiaoyun Yao
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Zhili Xun
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Zhijing Zhao
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Wenwen Yan
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Yirong Zou
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Di Liu
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China;
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Hui Li
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing 100083, China; (X.G.); (H.L.)
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China;
- Correspondence:
| | - Hai Lu
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing 100083, China; (X.G.); (H.L.)
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
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Zhu L, Wang X, Tian J, Zhang X, Yu T, Li Y, Li D. Genome-wide analysis of VPE family in four Gossypium species and transcriptional expression of VPEs in the upland cotton seedlings under abiotic stresses. Funct Integr Genomics 2022; 22:179-192. [DOI: 10.1007/s10142-021-00818-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 10/20/2021] [Accepted: 10/22/2021] [Indexed: 01/21/2023]
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24
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Wan Abdullah WMAN, Saidi NB, Yusof MT, Wee CY, Loh HS, Ong-Abdullah J, Lai KS. Vacuolar Processing Enzymes Modulating Susceptibility Response to Fusarium oxysporum f. sp. cubense Tropical Race 4 Infections in Banana. FRONTIERS IN PLANT SCIENCE 2022; 12:769855. [PMID: 35095950 PMCID: PMC8790485 DOI: 10.3389/fpls.2021.769855] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 12/13/2021] [Indexed: 06/14/2023]
Abstract
Fusarium oxysporum f. sp. cubense tropical race 4 (FocTR4) is a destructive necrotrophic fungal pathogen afflicting global banana production. Infection process involves the activation of programmed cell death (PCD). In this study, seven Musa acuminata vacuolar processing enzyme (MaVPE1-MaVPE7) genes associated with PCD were successfully identified. Phylogenetic analysis and tissue-specific expression categorized these MaVPEs into the seed and vegetative types. FocTR4 infection induced the majority of MaVPE expressions in the susceptible cultivar "Berangan" as compared to the resistant cultivar "Jari Buaya." Consistently, upon FocTR4 infection, high caspase-1 activity was detected in the susceptible cultivar, while low level of caspase-1 activity was recorded in the resistant cultivar. Furthermore, inhibition of MaVPE activities via caspase-1 inhibitor in the susceptible cultivar reduced tonoplast rupture, decreased lesion formation, and enhanced stress tolerance against FocTR4 infection. Additionally, the Arabidopsis VPE-null mutant exhibited higher tolerance to FocTR4 infection, indicated by reduced sporulation rate, low levels of H2O2 content, and high levels of cell viability. Comparative proteomic profiling analysis revealed increase in the abundance of cysteine proteinase in the inoculated susceptible cultivar, as opposed to cysteine proteinase inhibitors in the resistant cultivar. In conclusion, the increase in vacuolar processing enzyme (VPE)-mediated PCD played a crucial role in modulating susceptibility response during compatible interaction, which facilitated FocTR4 colonization in the host.
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Affiliation(s)
| | - Noor Baity Saidi
- Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Malaysia
| | - Mohd Termizi Yusof
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Malaysia
| | - Chien-Yeong Wee
- Biotechnology and Nanotechnology Research Centre, Malaysian Agricultural Research and Development Institute, Serdang, Malaysia
| | - Hwei-San Loh
- Faculty of Science, School of Biosciences, The University of Nottingham Malaysia Campus, Semenyih, Malaysia
- Biotechnology Research Centre, The University of Nottingham Malaysia Campus, Semenyih, Malaysia
| | - Janna Ong-Abdullah
- Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Malaysia
| | - Kok-Song Lai
- Health Sciences Division, Abu Dhabi Women’s College, Higher Colleges of Technology, Abu Dhabi, United Arab Emirates
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25
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Vogel-Mikuš K, Pongrac P. Imaging of Potassium and Calcium Distribution in Plant Tissues and Cells to Monitor Stress Response and Programmed Cell Death. Methods Mol Biol 2022; 2447:233-246. [PMID: 35583786 DOI: 10.1007/978-1-0716-2079-3_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In plants, the response to stress, such as salinity, pathogen attack, drought, high concentration of metals, hyperthermia, and hypothermia, is usually accompanied by potassium ion (K+) leakage from the cytosol to the cell wall, mediated by plasma membrane cation conductivity. Stress-induced electrolyte leakage co-occurs with accumulation of reactive oxygen species (ROS) and calcium ions (Ca2+) and often results in programmed cell death (PCD). The development of X-ray and mass spectrometry (MS) based imaging techniques has enabled insight into the spatial tissue and cell-specific redistribution of major and trace elements during the stress response. In this chapter a workflow for sample preparation, imaging, and image analysis by X-ray and MS based techniques is presented.
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Affiliation(s)
- Katarina Vogel-Mikuš
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia.
- Jozef Stefan Institute, Ljubljana, Slovenia.
| | - Paula Pongrac
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
- Jozef Stefan Institute, Ljubljana, Slovenia
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26
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Simoni EB, Oliveira CC, Fraga OT, Reis PAB, Fontes EPB. Cell Death Signaling From Endoplasmic Reticulum Stress: Plant-Specific and Conserved Features. FRONTIERS IN PLANT SCIENCE 2022; 13:835738. [PMID: 35185996 PMCID: PMC8850647 DOI: 10.3389/fpls.2022.835738] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 01/10/2022] [Indexed: 05/06/2023]
Abstract
The endoplasmic reticulum (ER) stress response is triggered by any condition that disrupts protein folding and promotes the accumulation of unfolded proteins in the lumen of the organelle. In eukaryotic cells, the evolutionarily conserved unfolded protein response is activated to clear unfolded proteins and restore ER homeostasis. The recovery from ER stress is accomplished by decreasing protein translation and loading into the organelle, increasing the ER protein processing capacity and ER-associated protein degradation activity. However, if the ER stress persists and cannot be reversed, the chronically prolonged stress leads to cellular dysfunction that activates cell death signaling as an ultimate attempt to survive. Accumulating evidence implicates ER stress-induced cell death signaling pathways as significant contributors for stress adaptation in plants, making modulators of ER stress pathways potentially attractive targets for stress tolerance engineering. Here, we summarize recent advances in understanding plant-specific molecular mechanisms that elicit cell death signaling from ER stress. We also highlight the conserved features of ER stress-induced cell death signaling in plants shared by eukaryotic cells.
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27
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Chen Y, Zhang D, Zhang X, Wang Z, Liu CF, Tam JP. Site-Specific Protein Modifications by an Engineered Asparaginyl Endopeptidase from Viola canadensis. Front Chem 2021; 9:768854. [PMID: 34746098 PMCID: PMC8568951 DOI: 10.3389/fchem.2021.768854] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 10/06/2021] [Indexed: 12/04/2022] Open
Abstract
Asparaginyl endopeptidases (AEPs) or legumains are Asn/Asp (Asx)-specific proteases that break peptide bonds, but also function as peptide asparaginyl ligases (PALs) that make peptide bonds. This ligase activity can be used for site-specific protein modifications in biochemical and biotechnological applications. Although AEPs are common, PALs are rare. We previously proposed ligase activity determinants (LADs) of these enzymes that could determine whether they catalyze formation or breakage of peptide bonds. LADs are key residues forming the S2 and S1' substrate-binding pockets flanking the S1 active site. Here, we build on the LAD hypothesis with the engineering of ligases from proteases by mutating the S2 and S1' pockets of VcAEP, an AEP from Viola canadensis. Wild type VcAEP yields <5% cyclic product from a linear substrate at pH 6.5, whereas the single mutants VcAEP-V238A (Vc1a) and VcAEP-Y168A (Vc1b) targeting the S2 and S1' substrate-binding pockets yielded 34 and 61% cyclic products, respectively. The double mutant VcAEP-V238A/Y168A (Vc1c) targeting both the S2 and S1' substrate-binding pockets yielded >90% cyclic products. Vc1c had cyclization efficiency of 917,759 M-1s-1, which is one of the fastest rates for ligases yet reported. Vc1c is useful for protein engineering applications, including labeling of DARPins and cell surface MCF-7, as well as producing cyclic protein sfGFP. Together, our work validates the importance of LADs for AEP ligase activity and provides valuable tools for site-specific modification of proteins and biologics.
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Affiliation(s)
- Yu Chen
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
- Synzymes and Natural Products Center, Nanyang Technological University, Singapore, Singapore
| | - Dingpeng Zhang
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
- Synzymes and Natural Products Center, Nanyang Technological University, Singapore, Singapore
| | - Xiaohong Zhang
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
- Synzymes and Natural Products Center, Nanyang Technological University, Singapore, Singapore
| | - Zhen Wang
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
- Synzymes and Natural Products Center, Nanyang Technological University, Singapore, Singapore
| | - Chuan-Fa Liu
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
- Synzymes and Natural Products Center, Nanyang Technological University, Singapore, Singapore
- Nanyang Institute of Structural Biology, Nanyang Technological University, Singapore, Singapore
| | - James P. Tam
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
- Synzymes and Natural Products Center, Nanyang Technological University, Singapore, Singapore
- Nanyang Institute of Structural Biology, Nanyang Technological University, Singapore, Singapore
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28
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Sharma M, Fuertes D, Perez-Gil J, Lois LM. SUMOylation in Phytopathogen Interactions: Balancing Invasion and Resistance. Front Cell Dev Biol 2021; 9:703795. [PMID: 34485289 PMCID: PMC8415633 DOI: 10.3389/fcell.2021.703795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 07/20/2021] [Indexed: 12/03/2022] Open
Abstract
Plants are constantly confronted by a multitude of biotic stresses involving a myriad of pathogens. In crops, pathogen infections result in significant agronomical losses worldwide posing a threat to food security. In order to enter plant tissues and establish a successful infection, phytopathogens have to surpass several physical, and chemical defense barriers. In recent years, post-translational modification (PTM) mechanisms have emerged as key players in plant defense against pathogens. PTMs allow a highly dynamic and rapid response in front of external challenges, increasing the complexity and precision of cellular responses. In this review, we focus on the role of SUMO conjugation (SUMOylation) in plant immunity against fungi, bacteria, and viruses. In plants, SUMO regulates multiple biological processes, ranging from development to responses arising from environmental challenges. During pathogen attack, SUMO not only modulates the activity of plant defense components, but also serves as a target of pathogen effectors, highlighting its broad role in plant immunity. Here, we summarize known pathogenic strategies targeting plant SUMOylation and, the plant SUMO conjugates involved in host-pathogen interactions. We also provide a catalog of candidate SUMO conjugates according to their role in defense responses. Finally, we discuss the complex role of SUMO in plant defense, focusing on key biological and experimental aspects that contribute to some controversial conclusions, and the opportunities for improving agricultural productivity by engineering SUMOylation in crop species.
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Affiliation(s)
- Manisha Sharma
- Centre for Research in Agricultural Genomics, CSIC-IRTA-UAB-UB, Barcelona, Spain.,Biosciences, College of Life and Environment Sciences, University of Exeter, Exeter, United Kingdom
| | - Diana Fuertes
- Centre for Research in Agricultural Genomics, CSIC-IRTA-UAB-UB, Barcelona, Spain
| | - Jordi Perez-Gil
- Centre for Research in Agricultural Genomics, CSIC-IRTA-UAB-UB, Barcelona, Spain
| | - L Maria Lois
- Centre for Research in Agricultural Genomics, CSIC-IRTA-UAB-UB, Barcelona, Spain.,Consejo Superior de Investigaciones Científicas, Barcelona, Spain
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29
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Fraga OT, de Melo BP, Quadros IPS, Reis PAB, Fontes EPB. Senescence-Associated Glycine max ( Gm) NAC Genes: Integration of Natural and Stress-Induced Leaf Senescence. Int J Mol Sci 2021; 22:8287. [PMID: 34361053 PMCID: PMC8348617 DOI: 10.3390/ijms22158287] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 07/20/2021] [Accepted: 07/24/2021] [Indexed: 11/30/2022] Open
Abstract
Leaf senescence is a genetically regulated developmental process that can be triggered by a variety of internal and external signals, including hormones and environmental stimuli. Among the senescence-associated genes controlling leaf senescence, the transcriptional factors (TFs) comprise a functional class that is highly active at the onset and during the progression of leaf senescence. The plant-specific NAC (NAM, ATAF, and CUC) TFs are essential for controlling leaf senescence. Several members of Arabidopsis AtNAC-SAGs are well characterized as players in elucidated regulatory networks. However, only a few soybean members of this class display well-known functions; knowledge about their regulatory circuits is still rudimentary. Here, we describe the expression profile of soybean GmNAC-SAGs upregulated by natural senescence and their functional correlation with putative AtNAC-SAGs orthologs. The mechanisms and the regulatory gene networks underlying GmNAC081- and GmNAC030-positive regulation in leaf senescence are discussed. Furthermore, new insights into the role of GmNAC065 as a negative senescence regulator are presented, demonstrating extraordinary functional conservation with the Arabidopsis counterpart. Finally, we describe a regulatory circuit which integrates a stress-induced cell death program with developmental leaf senescence via the NRP-NAC-VPE signaling module.
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Affiliation(s)
- Otto Teixeira Fraga
- Biochemistry and Molecular Biology Department, Universidade Federal de Viçosa, Viçosa 36570.000, MG, Brazil; (O.T.F.); (B.P.d.M.); (I.P.S.Q.); (P.A.B.R.)
- National Institute of Science and Technology in Plant-Pest Interactions, INCTIPP–BIOAGRO, Universidade Federal de Viçosa, Viçosa 36570.000, MG, Brazil
| | - Bruno Paes de Melo
- Biochemistry and Molecular Biology Department, Universidade Federal de Viçosa, Viçosa 36570.000, MG, Brazil; (O.T.F.); (B.P.d.M.); (I.P.S.Q.); (P.A.B.R.)
- Embrapa Genetic Resources and Biotechnology, Brasília 70770.917, DF, Brazil
| | - Iana Pedro Silva Quadros
- Biochemistry and Molecular Biology Department, Universidade Federal de Viçosa, Viçosa 36570.000, MG, Brazil; (O.T.F.); (B.P.d.M.); (I.P.S.Q.); (P.A.B.R.)
- National Institute of Science and Technology in Plant-Pest Interactions, INCTIPP–BIOAGRO, Universidade Federal de Viçosa, Viçosa 36570.000, MG, Brazil
| | - Pedro Augusto Braga Reis
- Biochemistry and Molecular Biology Department, Universidade Federal de Viçosa, Viçosa 36570.000, MG, Brazil; (O.T.F.); (B.P.d.M.); (I.P.S.Q.); (P.A.B.R.)
- National Institute of Science and Technology in Plant-Pest Interactions, INCTIPP–BIOAGRO, Universidade Federal de Viçosa, Viçosa 36570.000, MG, Brazil
| | - Elizabeth Pacheco Batista Fontes
- Biochemistry and Molecular Biology Department, Universidade Federal de Viçosa, Viçosa 36570.000, MG, Brazil; (O.T.F.); (B.P.d.M.); (I.P.S.Q.); (P.A.B.R.)
- National Institute of Science and Technology in Plant-Pest Interactions, INCTIPP–BIOAGRO, Universidade Federal de Viçosa, Viçosa 36570.000, MG, Brazil
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Mishra LS, Mishra S, Caddell DF, Coleman-Derr D, Funk C. The Plastid-Localized AtFtsHi3 Pseudo-Protease of Arabidopsis thaliana Has an Impact on Plant Growth and Drought Tolerance. FRONTIERS IN PLANT SCIENCE 2021; 12:694727. [PMID: 34249066 PMCID: PMC8261292 DOI: 10.3389/fpls.2021.694727] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 05/28/2021] [Indexed: 05/22/2023]
Abstract
While drought severely affects plant growth and crop production, the molecular mechanisms of the drought response of plants remain unclear. In this study, we demonstrated for the first time the effect of the pseudo-protease AtFtsHi3 of Arabidopsis thaliana on overall plant growth and in drought tolerance. An AtFTSHi3 knock-down mutant [ftshi3-1(kd)] displayed a pale-green phenotype with lower photosynthetic efficiency and Darwinian fitness compared to wild type (Wt). An observed delay in seed germination of ftshi3-1(kd) was attributed to overaccumulation of abscisic acid (ABA); ftshi3-1(kd) seedlings showed partial sensitivity to exogenous ABA. Being exposed to similar severity of soil drying, ftshi3-1(kd) was drought-tolerant up to 20 days after the last irrigation, while wild type plants wilted after 12 days. Leaves of ftshi3-1(kd) contained reduced stomata size, density, and a smaller stomatic aperture. During drought stress, ftshi3-1(kd) showed lowered stomatal conductance, increased intrinsic water-use efficiency (WUEi), and slower stress acclimation. Expression levels of ABA-responsive genes were higher in leaves of ftshi3-1(kd) than Wt; DREB1A, but not DREB2A, was significantly upregulated during drought. However, although ftshi3-1(kd) displayed a drought-tolerant phenotype in aboveground tissue, the root-associated bacterial community responded to drought.
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Affiliation(s)
| | - Sanatkumar Mishra
- Umeå Plant Science Center, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Daniel F. Caddell
- Plant Gene Expression Center, US Department of Agriculture-Agricultural Research Service, Albany, CA, United States
| | - Devin Coleman-Derr
- Plant Gene Expression Center, US Department of Agriculture-Agricultural Research Service, Albany, CA, United States
- Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, CA, United States
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31
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Jones K, Zhu J, Jenkinson CB, Kim DW, Pfeifer MA, Khang CH. Disruption of the Interfacial Membrane Leads to Magnaporthe oryzae Effector Re-location and Lifestyle Switch During Rice Blast Disease. Front Cell Dev Biol 2021; 9:681734. [PMID: 34222251 PMCID: PMC8248803 DOI: 10.3389/fcell.2021.681734] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 05/13/2021] [Indexed: 11/13/2022] Open
Abstract
To cause the devastating rice blast disease, the hemibiotrophic fungus Magnaporthe oryzae produces invasive hyphae (IH) that are enclosed in a plant-derived interfacial membrane, known as the extra-invasive hyphal membrane (EIHM), in living rice cells. Little is known about when the EIHM is disrupted and how the disruption contributes to blast disease. Here we show that the disruption of the EIHM correlates with the hyphal growth stage in first-invaded susceptible rice cells. Our approach utilized GFP that was secreted from IH as an EIHM integrity reporter. Secreted GFP (sec-GFP) accumulated in the EIHM compartment but appeared in the host cytoplasm when the integrity of the EIHM was compromised. Live-cell imaging coupled with sec-GFP and various fluorescent reporters revealed that the loss of EIHM integrity preceded shrinkage and eventual rupture of the rice vacuole. The vacuole rupture coincided with host cell death, which was limited to the invaded cell with presumed closure of plasmodesmata. We report that EIHM disruption and host cell death are landmarks that delineate three distinct infection phases (early biotrophic, late biotrophic, and transient necrotrophic phases) within the first-invaded cell before reestablishment of biotrophy in second-invaded cells. M. oryzae effectors exhibited infection phase-specific localizations, including entry of the apoplastic effector Bas4 into the host cytoplasm through the disrupted EIHM during the late biotrophic phase. Understanding how infection phase-specific cellular dynamics are regulated and linked to host susceptibility will offer potential targets that can be exploited to control blast disease.
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Affiliation(s)
- Kiersun Jones
- Department of Plant Biology, University of Georgia, Athens, GA, United States
| | - Jie Zhu
- Department of Plant Biology, University of Georgia, Athens, GA, United States
| | - Cory B Jenkinson
- Department of Plant Biology, University of Georgia, Athens, GA, United States
| | - Dong Won Kim
- Department of Plant Biology, University of Georgia, Athens, GA, United States
| | - Mariel A Pfeifer
- Department of Plant Biology, University of Georgia, Athens, GA, United States
| | - Chang Hyun Khang
- Department of Plant Biology, University of Georgia, Athens, GA, United States
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32
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Tang TMS, Luk LYP. Asparaginyl endopeptidases: enzymology, applications and limitations. Org Biomol Chem 2021; 19:5048-5062. [PMID: 34037066 PMCID: PMC8209628 DOI: 10.1039/d1ob00608h] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 05/12/2021] [Indexed: 12/15/2022]
Abstract
Asparaginyl endopeptidases (AEP) are cysteine proteases found in mammalian and plant cells. Several AEP isoforms from plant species were found to exhibit transpeptidase activity which is integral for the key head-to-tail cyclisation reaction during the biosynthesis of cyclotides. Since many plant AEPs exhibit excellent enzyme kinetics for peptide ligation via a relatively short substrate recognition sequence, they have become appealing tools for peptide and protein modification. In this review, research focused on the enzymology of AEPs and their applications in polypeptide cyclisation and labelling will be presented. Importantly, the limitations of using AEPs and opportunities for future research and innovation will also be discussed.
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Affiliation(s)
- T M Simon Tang
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK.
| | - Louis Y P Luk
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK. and Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
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33
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Bi G, Su M, Li N, Liang Y, Dang S, Xu J, Hu M, Wang J, Zou M, Deng Y, Li Q, Huang S, Li J, Chai J, He K, Chen YH, Zhou JM. The ZAR1 resistosome is a calcium-permeable channel triggering plant immune signaling. Cell 2021; 184:3528-3541.e12. [PMID: 33984278 DOI: 10.1016/j.cell.2021.05.003] [Citation(s) in RCA: 245] [Impact Index Per Article: 81.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 04/18/2021] [Accepted: 05/04/2021] [Indexed: 12/21/2022]
Abstract
Nucleotide-binding, leucine-rich repeat receptors (NLRs) are major immune receptors in plants and animals. Upon activation, the Arabidopsis NLR protein ZAR1 forms a pentameric resistosome in vitro and triggers immune responses and cell death in plants. In this study, we employed single-molecule imaging to show that the activated ZAR1 protein can form pentameric complexes in the plasma membrane. The ZAR1 resistosome displayed ion channel activity in Xenopus oocytes in a manner dependent on a conserved acidic residue Glu11 situated in the channel pore. Pre-assembled ZAR1 resistosome was readily incorporated into planar lipid-bilayers and displayed calcium-permeable cation-selective channel activity. Furthermore, we show that activation of ZAR1 in the plant cell led to Glu11-dependent Ca2+ influx, perturbation of subcellular structures, production of reactive oxygen species, and cell death. The results thus support that the ZAR1 resistosome acts as a calcium-permeable cation channel to trigger immunity and cell death.
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Affiliation(s)
- Guozhi Bi
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Min Su
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Nan Li
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Yu Liang
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Song Dang
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Jiachao Xu
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Meijuan Hu
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Jizong Wang
- State Key Laboratory of Protein and Plant Gene Research, School of Advanced Agricultural Sciences, Peking University, Beijing 100871, China
| | - Minxia Zou
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Science, Beijing Normal University, Beijing 100875, China; Key Laboratory of Cell Proliferation and Regulation of Ministry of Education, College of Life Science, Beijing Normal University, Beijing 100875, China
| | - Yanan Deng
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Qiyu Li
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Shijia Huang
- Beijing Advanced Innovation Center for Structural Biology, Tsinghua-Peking Joint Center for Life Sciences, Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Jiejie Li
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Science, Beijing Normal University, Beijing 100875, China; Key Laboratory of Cell Proliferation and Regulation of Ministry of Education, College of Life Science, Beijing Normal University, Beijing 100875, China
| | - Jijie Chai
- Beijing Advanced Innovation Center for Structural Biology, Tsinghua-Peking Joint Center for Life Sciences, Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China; Max-Planck Institute for Plant Breeding Research, Cologne, Germany; Institute of Biochemistry, University of Cologne, Zuelpicher Str. 47, 50674 Cologne, Germany.
| | - Kangmin He
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China; Innovation Academy for Seed Design, Chinese Academy of Sciences, Beijing 100101, China.
| | - Yu-Hang Chen
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China; Innovation Academy for Seed Design, Chinese Academy of Sciences, Beijing 100101, China.
| | - Jian-Min Zhou
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; Innovation Academy for Seed Design, Chinese Academy of Sciences, Beijing 100101, China; CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing 100049, China.
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Yan J, Li Y, Zhao P, Mu B, Chen Q, Li X, Cui X, Wang Z, Li J, Li S, Yang B, Jiang YQ. Membrane-Bound Transcriptional Activator NTL1 from Rapeseed Positively Modulates Leaf Senescence through Targeting Genes Involved in Reactive Oxygen Species Production and Programmed Cell Death. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:4968-4980. [PMID: 33877836 DOI: 10.1021/acs.jafc.1c00182] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Leaf senescence is the last stage of leaf development and is determined by various environmental and endogenous signals. Leaf senescence can determine plant productivity and fitness. Transcription factors (TFs) with the transmembrane domain constitute a special group of regulatory proteins that can translocate from the membrane system into nuclei to exert the transcriptional function upon endogenous or exogenous stimuli. Reactive oxygen species (ROSs) play an important role in numerous processes throughout the life cycle of plants including leaf senescence. Leaf senescence is characterized by massive programmed cell death (PCD) and is a type of developmental PCD. The transcriptional regulatory relationships between membrane-bound TFs and leaf senescence remain largely uncharacterized, especially in rapeseed (Brassica napus L.), an important oil crop. Here, we show that BnaNTL1 is a membrane-bound NAC (NAM, ATAF, and CUC) TF, which is predominantly expressed in senescent leaves. Expression of BnaNTL1ΔTM, a form of BnaNTL1 devoid of the transmembrane domain, can induce serious HR-like cell death symptoms and ROS accumulation in cells. Plants overexpressing BnaNTL1ΔTM show earlier leaf senescence compared with the control, accompanied by chlorophyll degradation and electrolyte leakage. Genes involved in ROS production (RbohD), PCD (VPEs and CEP1), and leaf senescence (BFN1) are significantly induced and activated by BnaNTL1ΔTM according to the quantitative reverse transcription PCR (qRT-PCR) analysis and dual luciferase reporter (Dual-LUC) assay. Moreover, electrophoretic mobility shift assay revealed that BnaNTL1 directly bound to the NTLBS elements in promoters of RbohD, γVPE, and BFN1. In conclusion, these results demonstrate that BnaNTL1 positively modulates ROS production and HR-like cell death to induce leaf senescence.
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Affiliation(s)
- Jingli Yan
- State Key Laboratory of Crop Stress Biology for Arid Areas and, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China
- College of Plant Protection, Henan Agricultural University, Zhengzhou, Henan 450002, China
| | - Yanfei Li
- State Key Laboratory of Crop Stress Biology for Arid Areas and, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China
| | - Peiyu Zhao
- State Key Laboratory of Crop Stress Biology for Arid Areas and, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China
| | - Bangbang Mu
- State Key Laboratory of Crop Stress Biology for Arid Areas and, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China
| | - Qinqin Chen
- State Key Laboratory of Crop Stress Biology for Arid Areas and, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China
| | - Xin Li
- State Key Laboratory of Crop Stress Biology for Arid Areas and, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China
| | - Xing Cui
- State Key Laboratory of Crop Stress Biology for Arid Areas and, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China
| | - Zhaoqiang Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas and, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China
| | - Jing Li
- State Key Laboratory of Crop Stress Biology for Arid Areas and, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China
| | - Shaojun Li
- State Key Laboratory of Crop Stress Biology for Arid Areas and, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China
| | - Bo Yang
- State Key Laboratory of Crop Stress Biology for Arid Areas and, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China
| | - Yuan-Qing Jiang
- State Key Laboratory of Crop Stress Biology for Arid Areas and, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China
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35
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Nonis SG, Haywood J, Mylne JS. Plant asparaginyl endopeptidases and their structural determinants of function. Biochem Soc Trans 2021; 49:965-976. [PMID: 33666219 PMCID: PMC8106488 DOI: 10.1042/bst20200908] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 02/09/2021] [Accepted: 02/10/2021] [Indexed: 12/14/2022]
Abstract
Asparaginyl endopeptidases (AEPs) are versatile enzymes that in biological systems are involved in producing three different catalytic outcomes for proteins, namely (i) routine cleavage by bond hydrolysis, (ii) peptide maturation, including macrocyclisation by a cleavage-coupled intramolecular transpeptidation and (iii) circular permutation involving separate cleavage and transpeptidation reactions resulting in a major reshuffling of protein sequence. AEPs differ in their preference for cleavage or transpeptidation reactions, catalytic efficiency, and preference for asparagine or aspartate target residues. We look at structural analyses of various AEPs that have laid the groundwork for identifying important determinants of AEP function in recent years, with much of the research impetus arising from the potential biotechnological and pharmaceutical applications.
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Affiliation(s)
- Samuel G. Nonis
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, Perth 6009, Australia
- The ARC Centre of Excellence in Plant Energy Biology, The University of Western Australia, 35 Stirling Highway, Crawley, Perth 6009, Australia
| | - Joel Haywood
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, Perth 6009, Australia
- The ARC Centre of Excellence in Plant Energy Biology, The University of Western Australia, 35 Stirling Highway, Crawley, Perth 6009, Australia
| | - Joshua S. Mylne
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, Perth 6009, Australia
- The ARC Centre of Excellence in Plant Energy Biology, The University of Western Australia, 35 Stirling Highway, Crawley, Perth 6009, Australia
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Xiao Y, Zhang L, Zhang H, Feng H, Li Z, Chen H. Interaction between endogenous H 2O 2 and OsVPE3 in the GA-induced PCD of rice aleurone layers. PLANT CELL REPORTS 2021; 40:691-705. [PMID: 33559721 DOI: 10.1007/s00299-021-02665-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 01/11/2021] [Indexed: 06/12/2023]
Abstract
Endogenous hydrogen peroxide (H2O2) is involved in regulating the gibberellic acid-induced programmed cell death (PCD) of the aleurone layers by cooperating with OsVPE3 during rice seed germination. Preliminary experiments revealed that H2O2 produced by the NOX pathway is the key factor affecting rice germination. Histochemical analysis indicated that H2O2 is located in the aleurone layer. Both the H2O2 scavenger DMTU and the NOX inhibitor DPI decreased H2O2 content and significantly slowed down vacuolation in a dose-dependent manner. Interestingly, DMTU down-regulated the OsNOX8 transcript or DMTU and DPI decreased the intracellular H2O2 level, resulting in a delay of PCD. In contrast, GA and H2O2 up-regulated the OsNOX8 transcript and intracellular H2O2 level, leading to premature PCD, and the effects of GA and H2O2 were reversed by DMTU and DPI, respectively. These results showed that the imbalance of intracellular H2O2 levels leads to the delayed or premature PCD. Further experiments indicated that GA up-regulated the OsVPE3 transcript and VPE activity, and the effect was reversed by DPI. Furthermore, Ac-YVAD-CMK significantly blocked H2O2 accumulation, and DPI + Ac-YVAD-CMK had a more significant inhibitory effect compared with DPI alone, resulting in the delayed PCD, suggesting that OsVPE3 regulates PCD by promoting H2O2 generation. Meanwhile, DPI significantly inhibited the OsVPE3 transcript and VPE activity, and in turn delayed PCD occurrence, suggesting that the H2O2 produced by the NOX pathway may regulate PCD by up-regulating the OsVPE3 transcript. Thus, the endogenous H2O2 produced by the NOX pathway mediates the GA-induced PCD of rice aleurone layers by interacting with OsVPE3.
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Affiliation(s)
- Yu Xiao
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, 570228, China
| | - Lulu Zhang
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, 570228, China
| | - Heting Zhang
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, 570228, China
| | - Hongyu Feng
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, 570228, China
| | - Zhe Li
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, 570228, China
| | - Huiping Chen
- Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou, 570228, China.
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37
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Roudaire T, Héloir MC, Wendehenne D, Zadoroznyj A, Dubrez L, Poinssot B. Cross Kingdom Immunity: The Role of Immune Receptors and Downstream Signaling in Animal and Plant Cell Death. Front Immunol 2021; 11:612452. [PMID: 33763054 PMCID: PMC7982415 DOI: 10.3389/fimmu.2020.612452] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 12/29/2020] [Indexed: 12/14/2022] Open
Abstract
Both plants and animals are endowed with sophisticated innate immune systems to combat microbial attack. In these multicellular eukaryotes, innate immunity implies the presence of cell surface receptors and intracellular receptors able to detect danger signal referred as damage-associated molecular patterns (DAMPs) and pathogen-associated molecular patterns (PAMPs). Membrane-associated pattern recognition receptors (PRRs), such as Toll-like receptors (TLRs), C-type lectin receptors (CLRs), receptor-like kinases (RLKs), and receptor-like proteins (RLPs) are employed by these organisms for sensing different invasion patterns before triggering antimicrobial defenses that can be associated with a form of regulated cell death. Intracellularly, animals nucleotide-binding and oligomerization domain (NOD)-like receptors or plants nucleotide-binding domain (NBD)-containing leucine rich repeats (NLRs) immune receptors likely detect effectors injected into the host cell by the pathogen to hijack the immune signaling cascade. Interestingly, during the co-evolution between the hosts and their invaders, key cross-kingdom cell death-signaling macromolecular NLR-complexes have been selected, such as the inflammasome in mammals and the recently discovered resistosome in plants. In both cases, a regulated cell death located at the site of infection constitutes a very effective mean for blocking the pathogen spread and protecting the whole organism from invasion. This review aims to describe the immune mechanisms in animals and plants, mainly focusing on cell death signaling pathways, in order to highlight recent advances that could be used on one side or the other to identify the missing signaling elements between the perception of the invasion pattern by immune receptors, the induction of defenses or the transmission of danger signals to other cells. Although knowledge of plant immunity is less advanced, these organisms have certain advantages allowing easier identification of signaling events, regulators and executors of cell death, which could then be exploited directly for crop protection purposes or by analogy for medical research.
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Affiliation(s)
- Thibault Roudaire
- Agroécologie, Agrosup Dijon, CNRS, INRAE, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, Dijon, France
| | - Marie-Claire Héloir
- Agroécologie, Agrosup Dijon, CNRS, INRAE, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, Dijon, France
| | - David Wendehenne
- Agroécologie, Agrosup Dijon, CNRS, INRAE, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, Dijon, France
| | - Aymeric Zadoroznyj
- Institut National de la Santé et de la Recherche Médicale (Inserm), LNC UMR1231, Dijon, France.,LNC UMR1231, Université de Bourgogne Franche-Comté, Dijon, France
| | - Laurence Dubrez
- Institut National de la Santé et de la Recherche Médicale (Inserm), LNC UMR1231, Dijon, France.,LNC UMR1231, Université de Bourgogne Franche-Comté, Dijon, France
| | - Benoit Poinssot
- Agroécologie, Agrosup Dijon, CNRS, INRAE, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, Dijon, France
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Yan J, Chen Q, Cui X, Zhao P, Gao S, Yang B, Liu JX, Tong T, Deyholos MK, Jiang YQ. Ectopic overexpression of a membrane-tethered transcription factor gene NAC60 from oilseed rape positively modulates programmed cell death and age-triggered leaf senescence. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2021; 105:600-618. [PMID: 33119146 DOI: 10.1111/tpj.15057] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 07/08/2020] [Accepted: 07/13/2020] [Indexed: 06/11/2023]
Abstract
Senescence is an integrative final stage of plant development that is governed by internal and external cues. The NAM, ATAF1/2, CUC2 (NAC) transcription factor (TF) family is specific to plants and membrane-tethered NAC TFs (MTTFs) constitute a unique and sophisticated mechanism in stress responses and development. However, the function of MTTFs in oilseed rape (Brassica napus L.) remains unknown. Here, we report that BnaNAC60 is an MTTF associated with the endoplasmic reticulum (ER) membrane. Expression of BnaNAC60 was induced during the progression of leaf senescence. Translocation of BnaNAC60 into nuclei was induced by ER stress and oxidative stress treatments. It binds to the NTLBS motif, rather than the canonical NAC recognition site. Overexpression of BnaNAC60 devoid of the transmembrane domain, but not the full-length BnaNAC60, induces significant reactive oxygen species (ROS) accumulation and hypersensitive response-like cell death in both tobacco (Nicotiana benthamiana) and oilseed rape protoplasts. Moreover, ectopic overexpression of BnaNAC60 devoid of the transmembrane domain, but not the full-length BnaNAC60, in Arabidopsis also induces precocious leaf senescence. Furthermore, screening and expression profiling identified an array of functional genes that are significantly induced by BnaNAC60 expression. Further it was found that BnaNAC60 can activate the promoter activities of BnaNYC1, BnaRbohD, BnaBFN1, BnaZAT12, and multiple BnaVPEs in a dual-luciferase reporter assay. Electrophoretic mobility shift assay and chromatin immunoprecipitation coupled to quantitative PCR assays revealed that BnaNAC60 directly binds to the promoter regions of these downstream target genes. To summarize, our data show that BnaNAC60 is an MTTF that modulates cell death, ROS accumulation, and leaf senescence.
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Affiliation(s)
- Jingli Yan
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Qinqin Chen
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Xing Cui
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Peiyu Zhao
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Shidong Gao
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Bo Yang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Jian-Xiang Liu
- State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Tiantian Tong
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Michael K Deyholos
- Department of Biology, University of British Columbia, Okanagan Campus, Kelowna, BC, V1V 1V7, Canada
| | - Yuan-Qing Jiang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, 712100, China
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Sychta K, Słomka A, Kuta E. Insights into Plant Programmed Cell Death Induced by Heavy Metals-Discovering a Terra Incognita. Cells 2021; 10:cells10010065. [PMID: 33406697 PMCID: PMC7823951 DOI: 10.3390/cells10010065] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Revised: 12/29/2020] [Accepted: 12/30/2020] [Indexed: 02/06/2023] Open
Abstract
Programmed cell death (PCD) is a process that plays a fundamental role in plant development and responses to biotic and abiotic stresses. Knowledge of plant PCD mechanisms is still very scarce and is incomparable to the large number of studies on PCD mechanisms in animals. Quick and accurate assays, e.g., the TUNEL assay, comet assay, and analysis of caspase-like enzyme activity, enable the differentiation of PCD from necrosis. Two main types of plant PCD, developmental (dPCD) regulated by internal factors, and environmental (ePCD) induced by external stimuli, are distinguished based on the differences in the expression of the conserved PCD-inducing genes. Abiotic stress factors, including heavy metals, induce necrosis or ePCD. Heavy metals induce PCD by triggering oxidative stress via reactive oxygen species (ROS) overproduction. ROS that are mainly produced by mitochondria modulate phytotoxicity mechanisms induced by heavy metals. Complex crosstalk between ROS, hormones (ethylene), nitric oxide (NO), and calcium ions evokes PCD, with proteases with caspase-like activity executing PCD in plant cells exposed to heavy metals. This pathway leads to very similar cytological hallmarks of heavy metal induced PCD to PCD induced by other abiotic factors. The forms, hallmarks, mechanisms, and genetic regulation of plant ePCD induced by abiotic stress are reviewed here in detail, with an emphasis on plant cell culture as a suitable model for PCD studies. The similarities and differences between plant and animal PCD are also discussed.
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40
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Liu T, Wang H, Liu Z, Pang Z, Zhang C, Zhao M, Ning B, Song B, Liu S, He Z, Wei W, Wu J, Liu Y, Xu P, Zhang S. The 26S Proteasome Regulatory Subunit GmPSMD Promotes Resistance to Phytophthora sojae in Soybean. FRONTIERS IN PLANT SCIENCE 2021; 12:513388. [PMID: 33584766 PMCID: PMC7876454 DOI: 10.3389/fpls.2021.513388] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 01/04/2021] [Indexed: 05/19/2023]
Abstract
Phytophthora root rot, caused by Phytophthora sojae is a destructive disease of soybean (Glycine max) worldwide. We previously confirmed that the bHLH transcription factor GmPIB1 (P. sojae-inducible bHLH transcription factor) reduces accumulation of reactive oxygen species (ROS) in cells by inhibiting expression of the peroxidase-related gene GmSPOD thus improving the resistance of hairy roots to P. sojae. To identify proteins interacting with GmPIB1 and assess their participation in the defense response to P. sojae, we obtained transgenic soybean hairy roots overexpressing GmPIB1 by Agrobacterium rhizogenes mediated transformation and examined GmPIB1 protein-protein interactions using immunoprecipitation combined with mass spectrometry. We identified 392 proteins likely interacting with GmPIB1 and selected 20 candidate genes, and only 26S proteasome regulatory subunit GmPSMD (Genbank accession no. XP_014631720) interacted with GmPIB1 in luciferase complementation and pull-down experiments and yeast two-hybrid assays. Overexpression of GmPSMD (GmPSMD-OE) in soybean hairy roots remarkably improved resistance to P. sojae and RNA interference of GmPSMD (GmPSMD -RNAi) increased susceptibility. In addition, accumulation of total ROS and hydrogen peroxide (H2O2) in GmPSMD-OE transgenic soybean hairy roots were remarkably lower than those of the control after P. sojae infection. Moreover, in GmPSMD-RNAi transgenic soybean hairy roots, H2O2 and the accumulation of total ROS exceeded those of the control. There was no obvious difference in superoxide anion (O2 -) content between control and transgenic hairy roots. Antioxidant enzymes include peroxidase (POD), glutathione peroxidase (GPX), superoxide dismutase (SOD), catalase (CAT) are responsible for ROS scavenging in soybean. The activities of these antioxidant enzymes were remarkably higher in GmPSMD-OE transgenic soybean hairy roots than those in control, but were reduced in GmPSMD-RNAi transgenic soybean hairy roots. Moreover, the activity of 26S proteasome in GmPSMD-OE and GmPIB1-OE transgenic soybean hairy roots was significantly higher than that in control and was significantly lower in PSMD-RNAi soybean hairy roots after P. sojae infection. These data suggest that GmPSMD might reduce the production of ROS by improving the activity of antioxidant enzymes such as POD, SOD, GPX, CAT, and GmPSMD plays a significant role in the response of soybean to P. sojae. Our study reveals a valuable mechanism for regulation of the pathogen response by the 26S proteasome in soybean.
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Affiliation(s)
- Tengfei Liu
- Key Laboratory of Soybean Biology of Chinese Education Ministry, Soybean Research Institute, Northeast Agricultural University, Harbin, China
| | - Huiyu Wang
- Key Laboratory of Soybean Biology of Chinese Education Ministry, Soybean Research Institute, Northeast Agricultural University, Harbin, China
| | - Zhanyu Liu
- Key Laboratory of Soybean Biology of Chinese Education Ministry, Soybean Research Institute, Northeast Agricultural University, Harbin, China
| | - Ze Pang
- Key Laboratory of Soybean Biology of Chinese Education Ministry, Soybean Research Institute, Northeast Agricultural University, Harbin, China
| | - Chuanzhong Zhang
- Key Laboratory of Soybean Biology of Chinese Education Ministry, Soybean Research Institute, Northeast Agricultural University, Harbin, China
| | - Ming Zhao
- Key Laboratory of Soybean Biology of Chinese Education Ministry, Soybean Research Institute, Northeast Agricultural University, Harbin, China
| | - Bin Ning
- Key Laboratory of Soybean Biology of Chinese Education Ministry, Soybean Research Institute, Northeast Agricultural University, Harbin, China
| | - Bo Song
- Key Laboratory of Soybean Biology of Chinese Education Ministry, Soybean Research Institute, Northeast Agricultural University, Harbin, China
| | - Shanshan Liu
- Key Laboratory of Soybean Biology of Chinese Education Ministry, Soybean Research Institute, Northeast Agricultural University, Harbin, China
- *Correspondence: Shanshan Liu,
| | - Zili He
- Key Laboratory of Soybean Biology of Chinese Education Ministry, Soybean Research Institute, Northeast Agricultural University, Harbin, China
| | - Wanling Wei
- Key Laboratory of Soybean Biology of Chinese Education Ministry, Soybean Research Institute, Northeast Agricultural University, Harbin, China
| | - Junjiang Wu
- Key Laboratory of Soybean Cultivation of Ministry of Agriculture P. R. China, Soybean Research Institute of Heilongjiang Academy of Agricultural Sciences, Harbin, China
| | - Yaguang Liu
- Key Laboratory of Soybean Biology of Chinese Education Ministry, Soybean Research Institute, Northeast Agricultural University, Harbin, China
| | - Pengfei Xu
- Key Laboratory of Soybean Biology of Chinese Education Ministry, Soybean Research Institute, Northeast Agricultural University, Harbin, China
- Pengfei Xu,
| | - Shuzhen Zhang
- Key Laboratory of Soybean Biology of Chinese Education Ministry, Soybean Research Institute, Northeast Agricultural University, Harbin, China
- Shuzhen Zhang,
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Biswas MS, Mano J. Lipid Peroxide-Derived Reactive Carbonyl Species as Mediators of Oxidative Stress and Signaling. FRONTIERS IN PLANT SCIENCE 2021; 12:720867. [PMID: 34777410 PMCID: PMC8581730 DOI: 10.3389/fpls.2021.720867] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2021] [Accepted: 10/01/2021] [Indexed: 05/12/2023]
Abstract
Oxidation of membrane lipids by reactive oxygen species (ROS) or O2/lipoxygenase leads to the formation of various bioactive compounds collectively called oxylipins. Reactive carbonyl species (RCS) are a group of oxylipins that have the α,β-unsaturated carbonyl structure, including acrolein and 4-hydroxy-(E)-2-nonenal. RCS provides a missing link between ROS stimuli and cellular responses in plants via their electrophilic modification of proteins. The physiological significance of RCS in plants has been established based on the observations that the RCS-scavenging enzymes that are overexpressed in plants or the RCS-scavenging chemicals added to plants suppress the plants' responses to ROS, i.e., photoinhibition, aluminum-induced root damage, programmed cell death (PCD), senescence, abscisic acid-induced stomata closure, and auxin-induced lateral root formation. The functions of RCS are thus a key to ROS- and redox-signaling in plants. The chemical species involved in distinct RCS signaling/damaging phenomena were recently revealed, based on comprehensive carbonyl determinations. This review presents an overview of the current status of research regarding RCS signaling functions in plants and discusses present challenges for gaining a more complete understanding of the signaling mechanisms.
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Affiliation(s)
- Md. Sanaullah Biswas
- Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh
| | - Jun’ichi Mano
- Science Research Center, Yamaguchi University, Yamaguchi, Japan
- *Correspondence: Jun’ichi Mano,
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Chen G, Li R, Shen X. ApSerpin-ZX from Agapanthus praecox, is a potential cryoprotective agent to plant cryopreservation. Cryobiology 2020; 98:103-111. [PMID: 33316226 DOI: 10.1016/j.cryobiol.2020.11.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 11/17/2020] [Accepted: 11/19/2020] [Indexed: 10/22/2022]
Abstract
Cryopreservation-induced cell death is regarded as an important problem faced by cryobiologists. Oxidative stress and programmed cell death are detrimental to cell survival. Serine protease inhibitors (serpins) inhibit pro-cell-death proteases and play a pro-survival role in excessive cell death induced by abiotic stress. In this study, ApSerpin-ZX was isolated from Agapanthus praecox and characterized as a protective protein in plant cryopreservation. The mRNA level of ApSerpin-ZX was elevated under abiotic stress, such as salt, osmosis, oxidative, cold, and cryoinjury. The purified recombinant protein expressed in E. coli was added to the plant vitrification solution and used for A. praecox embryogenic callus cryopreservation. The concentration of 0.6-4.8 mg∙L-1 of ApSerpin-ZX protein was beneficial to the survival of cryopreserved embryogenic callus of A. praecox. The most effective concentration was 1.2 mg∙L-1, which elevated the survival by 37.15%. Subsequently, the cryopreservation procedure with 1.2 mg∙L-1 of ApSerpin-ZX protein was regarded as the treated group, compared to standard procedure, to determine the physiological mechanism of ApSerpin-ZX protein on cryopreserved cell. The MDA and H2O2 contents were significantly decreased in the treated group, along with reduced OH· generation activity in the recovery stage. After the addition of ApSerpin-ZX, the POD and CAT activities keep increased, while SOD activity increased only after dehydration. Besides, the caspase-1-like and caspase-3-like activities were lower than the standard procedure. This study indicated that ApSerpin-ZX was a potential cryoprotective agent that alleviated oxidative stress and cell death induced by cryopreservation.
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Affiliation(s)
- Guanqun Chen
- School of Design, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Ruilian Li
- School of Design, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Xiaohui Shen
- School of Design, Shanghai Jiao Tong University, Shanghai, 200240, China.
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43
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Jackson MA, Nguyen LT, Gilding EK, Durek T, Craik DJ. Make it or break it: Plant AEPs on stage in biotechnology. Biotechnol Adv 2020; 45:107651. [DOI: 10.1016/j.biotechadv.2020.107651] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 10/02/2020] [Accepted: 10/20/2020] [Indexed: 12/11/2022]
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Teper-Bamnolker P, Danieli R, Peled-Zehavi H, Belausov E, Abu-Abied M, Avin-Wittenberg T, Sadot E, Eshel D. Vacuolar processing enzyme translocates to the vacuole through the autophagy pathway to induce programmed cell death. Autophagy 2020; 17:3109-3123. [PMID: 33249982 DOI: 10.1080/15548627.2020.1856492] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/09/2022] Open
Abstract
The caspase-like vacuolar processing enzyme (VPE) is a key factor in programmed cell death (PCD) associated with plant stress responses. Growth medium lacking a carbon source and dark conditions caused punctate labeling of 35S::VPE1-GFP (StVPE1-GFP) in potato leaves. Under conditions of carbon starvation, VPE activity and PCD symptoms strongly increased in BY-2 cells, but to a much lesser extent in VPE-RNAi BY-2 cells. During extended exposure to carbon starvation, VPE expression and activity levels peaked, with a gradual increase in BY-2 cell death. Histological analysis of StVPE1-GFP in BY-2 cells showed that carbon starvation induces its translocation from the endoplasmic reticulum to the central vacuole through tonoplast engulfment. Exposure of BY-2 culture to the macroautophagy/autophagy inhibitor concanamycin A led to, along with an accumulation of autophagic bodies, accumulation of StVPE1-GFP in the cell vacuole. This accumulation did not occur in the presence of 3-methyladenine, an inhibitor of early-stage autophagy. BY-2 cells constitutively expressing RFP-StATG8IL, an autophagosome marker, showed colocalization with the StVPE1-GFP protein in the cytoplasm and vacuole. RNAi silencing of the core autophagy component ATG4 in BY-2 cells reduced VPE activity and cell death. These results are the first to suggest that VPE translocates to the cell vacuole through the autophagy pathway, leading to PCD.Abbreviations: ATG: autophagy related; CLP: caspase-like protease; HR: hypersensitive response; PCD: programmed cell death; St: Solanum tuberosum; VPE: vacuolar processing enzyme.
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Affiliation(s)
| | - Raz Danieli
- Department of Postharvest Science, The Volcani Center, ARO, Rishon LeZion, Israel.,Institute of Plant Sciences and Genetics in Agriculture, the Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot Israel
| | - Hadas Peled-Zehavi
- Department of Plant and Environmental Sciences, The Weizmann Institute of Science, Rehovot Israel
| | - Eduard Belausov
- Department of Ornamental Horticulture, The Volcani Center, ARO, Rishon LeZion, Israel
| | - Mohamad Abu-Abied
- Department of Ornamental Horticulture, The Volcani Center, ARO, Rishon LeZion, Israel
| | - Tamar Avin-Wittenberg
- Department of Plant and Environmental Sciences, Alexander Silberman Institute of Life Sciences, the Hebrew University of Jerusalem, Givat Ram, Jerusalem, Israel
| | - Einat Sadot
- Department of Ornamental Horticulture, The Volcani Center, ARO, Rishon LeZion, Israel
| | - Dani Eshel
- Department of Postharvest Science, The Volcani Center, ARO, Rishon LeZion, Israel
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45
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Valandro F, Menguer PK, Cabreira-Cagliari C, Margis-Pinheiro M, Cagliari A. Programmed cell death (PCD) control in plants: New insights from the Arabidopsis thaliana deathosome. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2020; 299:110603. [PMID: 32900441 DOI: 10.1016/j.plantsci.2020.110603] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 05/28/2020] [Accepted: 07/14/2020] [Indexed: 06/11/2023]
Abstract
Programmed cell death (PCD) is a genetically controlled process that leads to cell suicide in both eukaryotic and prokaryotic organisms. In plants PCD occurs during development, defence response and when exposed to adverse conditions. PCD acts controlling the number of cells by eliminating damaged, old, or unnecessary cells to maintain cellular homeostasis. Unlike in animals, the knowledge about PCD in plants is limited. The molecular network that controls plant PCD is poorly understood. Here we present a review of the current mechanisms involved with the genetic control of PCD in plants. We also present an updated version of the AtLSD1 deathosome, which was previously proposed as a network controlling HR-mediated cell death in Arabidopsis thaliana. Finally, we discuss the unclear points and open questions related to the AtLSD1 deathosome.
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Affiliation(s)
- Fernanda Valandro
- Programa de Pós-Graduação em Genética e Biologia Molecular, Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil; Universidade Federal do Rio Grande do Sul (UFRGS), RS, Brazil.
| | - Paloma Koprovski Menguer
- Programa de Pós-Graduação em Biologia Celular e Molecular, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil; Universidade Federal do Rio Grande do Sul (UFRGS), RS, Brazil.
| | | | - Márcia Margis-Pinheiro
- Programa de Pós-Graduação em Biologia Celular e Molecular, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil; Universidade Federal do Rio Grande do Sul (UFRGS), RS, Brazil.
| | - Alexandro Cagliari
- Programa de Pós-Graduação em Ambiente e Sustentabilidade, Universidade Estadual do Rio Grande do Sul, RS, Brazil; Universidade Estadual do Rio Grande do Sul (UERGS), RS, Brazil.
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46
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Wang R, Liu C, Li Q, Chen Z, Sun S, Wang X. Spatiotemporal Resolved Leaf Angle Establishment Improves Rice Grain Yield via Controlling Population Density. iScience 2020; 23:101489. [PMID: 32898833 PMCID: PMC7486458 DOI: 10.1016/j.isci.2020.101489] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 08/10/2020] [Accepted: 08/18/2020] [Indexed: 11/15/2022] Open
Abstract
Leaf angle is mainly determined by the lamina joint (LJ) and contributes to ideal crop architecture for high yield. Here, we dissected five successive stages with distinct cytological features of LJs spanning organogenesis to leaf angle formation and obtained the underlying stage-specific mRNAs and small RNAs, which well explained the cytological dynamics during LJ organogenesis and leaf angle plasticity. Combining the gene coexpression correlation with high-throughput promoter analysis, we identified a set of transcription factors (TFs) determining the stage- and/or cytological structure-specific profiles. The functional studies of these TFs demonstrated that cytological dynamics determined leaf angle and that the knockout rice of these TFs with erect leaves significantly enhanced yield by maintaining the proper tiller number under dense planting. This work revealed the high-resolution mechanisms of how the cytological dynamics of LJ determined leaf erectness and served as a valuable resource to remodel rice architecture for high yield by controlling population density.
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Affiliation(s)
- Rongna Wang
- National Key Laboratory of Crop Genetic Improvement, College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Science, Henan University, Kaifeng 475004, China
| | - Chang Liu
- National Key Laboratory of Crop Genetic Improvement, College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Science, Henan University, Kaifeng 475004, China
| | - Qinzhong Li
- National Key Laboratory of Crop Genetic Improvement, College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Zhina Chen
- National Key Laboratory of Crop Genetic Improvement, College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Shiyong Sun
- State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Science, Henan University, Kaifeng 475004, China.
| | - Xuelu Wang
- State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Science, Henan University, Kaifeng 475004, China.
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Li JW, Zhang SB, Xi HP, Bradshaw CJA, Zhang JL. Processes controlling programmed cell death of root velamen radicum in an epiphytic orchid. ANNALS OF BOTANY 2020; 126:261-275. [PMID: 32318689 PMCID: PMC7380463 DOI: 10.1093/aob/mcaa077] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Accepted: 04/18/2020] [Indexed: 05/06/2023]
Abstract
BACKGROUND AND AIMS Development of the velamen radicum on the outer surface of the root epidermis is an important characteristic for water uptake and retention in some plant families, particularly epiphytic orchids, for survival under water-limited environments. Velamen radicum cells derive from the primary root meristem; however, following this development, velamen radicum cells die by incompletely understood processes of programmed cell death (PCD). METHODS We combined the use of transmission electron microscopy, X-ray micro-tomography and transcriptome methods to characterize the major anatomical and molecular changes that occur during the development and death of velamen radicum cells of Cymbidium tracyanum, a typical epiphytic orchid, to determine how PCD occurs. KEY RESULTS Typical changes of PCD in anatomy and gene expression were observed in the development of velamen radicum cells. During the initiation of PCD, we found that both cell and vacuole size increased, and several genes involved in brassinosteroid and ethylene pathways were upregulated. In the stage of secondary cell wall formation, significant anatomical changes included DNA degradation, cytoplasm thinning, organelle decrease, vacuole rupture and cell wall thickening. Changes were found in the expression of genes related to the biosynthesis of cellulose and lignin, which are instrumental in the formation of secondary cell walls, and are regulated by cytoskeleton-related factors and phenylalanine ammonia-lyase. In the final stage of PCD, cell autolysis was terminated from the outside to the inside of the velamen radicum. The regulation of genes related to autophagy, vacuolar processing enzyme, cysteine proteases and metacaspase was involved in the final execution of cell death and autolysis. CONCLUSIONS Our results showed that the development of the root velamen radicum in an epiphytic orchid was controlled by the process of PCD, which included initiation of PCD, followed by formation of the secondary cell wall, and execution of autolysis following cell death.
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Affiliation(s)
- Jia-Wei Li
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China
- Center of Plant Ecology, Core Botanical Gardens, Chinese Academy of Sciences, Mengla, Yunnan, China
| | - Shi-Bao Zhang
- Key Laboratory for Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan, China
- For correspondence. E-mail or
| | - Hui-Peng Xi
- Horticulture Department, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China
| | - Corey J A Bradshaw
- Global Ecology, College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, South Australia, Australia
| | - Jiao-Lin Zhang
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China
- Center of Plant Ecology, Core Botanical Gardens, Chinese Academy of Sciences, Mengla, Yunnan, China
- For correspondence. E-mail or
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48
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Dall E, Zauner FB, Soh WT, Demir F, Dahms SO, Cabrele C, Huesgen PF, Brandstetter H. Structural and functional studies of Arabidopsis thaliana legumain beta reveal isoform specific mechanisms of activation and substrate recognition. J Biol Chem 2020; 295:13047-13064. [PMID: 32719006 PMCID: PMC7489914 DOI: 10.1074/jbc.ra120.014478] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 07/14/2020] [Indexed: 01/19/2023] Open
Abstract
The vacuolar cysteine protease legumain plays important functions in seed maturation and plant programmed cell death. Because of their dual protease and ligase activity, plant legumains have become of particular biotechnological interest, e.g. for the synthesis of cyclic peptides for drug design or for protein engineering. However, the molecular mechanisms behind their dual protease and ligase activities are still poorly understood, limiting their applications. Here, we present the crystal structure of Arabidopsis thaliana legumain isoform β (AtLEGβ) in its zymogen state. Combining structural and biochemical experiments, we show for the first time that plant legumains encode distinct, isoform-specific activation mechanisms. Whereas the autocatalytic activation of isoform γ (AtLEGγ) is controlled by the latency-conferring dimer state, the activation of the monomeric AtLEGβ is concentration independent. Additionally, in AtLEGβ the plant-characteristic two-chain intermediate state is stabilized by hydrophobic rather than ionic interactions, as in AtLEGγ, resulting in significantly different pH stability profiles. The crystal structure of AtLEGβ revealed unrestricted nonprime substrate binding pockets, consistent with the broad substrate specificity, as determined by degradomic assays. Further to its protease activity, we show that AtLEGβ exhibits a true peptide ligase activity. Whereas cleavage-dependent transpeptidase activity has been reported for other plant legumains, AtLEGβ is the first example of a plant legumain capable of linking free termini. The discovery of these isoform-specific differences will allow us to identify and rationally design efficient ligases with application in biotechnology and drug development.
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Affiliation(s)
- Elfriede Dall
- Department of Biosciences, University of Salzburg, Salzburg, Austria.
| | - Florian B Zauner
- Department of Biosciences, University of Salzburg, Salzburg, Austria
| | - Wai Tuck Soh
- Department of Biosciences, University of Salzburg, Salzburg, Austria
| | - Fatih Demir
- Central Institute for Engineering, Electronics and Analytics, ZEA-3, Forschungszentrum Jülich, Jülich, Germany
| | - Sven O Dahms
- Department of Biosciences, University of Salzburg, Salzburg, Austria
| | - Chiara Cabrele
- Department of Biosciences, University of Salzburg, Salzburg, Austria
| | - Pitter F Huesgen
- Central Institute for Engineering, Electronics and Analytics, ZEA-3, Forschungszentrum Jülich, Jülich, Germany; CECAD, Medical Faculty and University Hospital, University of Cologne, Cologne, Germany; Institute for Biochemistry, Faculty of Mathematics and Natural Sciences, University of Cologne, Cologne, Germany
| | - Hans Brandstetter
- Department of Biosciences, University of Salzburg, Salzburg, Austria.
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Doronina TV, Sheval EV, Lazareva EM. Programmed Cell Death during Formation of the Embryo Sac and Seed. Russ J Dev Biol 2020. [DOI: 10.1134/s1062360420030029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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50
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The effect of phytoglobin overexpression on the plant proteome during nonhost response of barley (Hordeum vulgare) to wheat powdery mildew (Blumeria graminis f. sp. tritici). Sci Rep 2020; 10:9192. [PMID: 32513937 PMCID: PMC7280273 DOI: 10.1038/s41598-020-65907-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 05/05/2020] [Indexed: 11/08/2022] Open
Abstract
Nonhost resistance, a resistance of plant species against all nonadapted pathogens, is considered the most durable and efficient immune system in plants. To increase our understanding of the response of barley plants to infection by powdery mildew, Blumeria graminis f. sp. tritici, we used quantitative proteomic analysis (LC-MS/MS). We compared the response of two genotypes of barley cultivar Golden Promise, wild type (WT) and plants with overexpression of phytoglobin (previously hemoglobin) class 1 (HO), which has previously been shown to significantly weaken nonhost resistance. A total of 8804 proteins were identified and quantified, out of which the abundance of 1044 proteins changed significantly in at least one of the four comparisons ('i' stands for 'inoculated')- HO/WT and HOi/WTi (giving genotype differences), and WTi/WT and HOi/HO (giving treatment differences). Among these differentially abundant proteins (DAP) were proteins related to structural organization, disease/defense, metabolism, transporters, signal transduction and protein synthesis. We demonstrate that quantitative changes in the proteome can explain physiological changes observed during the infection process such as progression of the mildew infection in HO plants that was correlated with changes in proteins taking part in papillae formation and preinvasion resistance. Overexpression of phytoglobins led to modification in signal transduction prominently by dramatically reducing the number of kinases induced, but also in the turnover of other signaling molecules such as phytohormones, polyamines and Ca2+. Thus, quantitative proteomics broaden our understanding of the role NO and phytoglobins play in barley during nonhost resistance against powdery mildew.
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