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Sun Z, Guo X, Kumar RMS, Huang C, Xie Y, Li M, Li J. Transcriptomic and metabolomic analyses reveal the importance of ethylene networks in mulberry fruit ripening. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2024; 344:112084. [PMID: 38614360 DOI: 10.1016/j.plantsci.2024.112084] [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: 12/29/2023] [Revised: 03/21/2024] [Accepted: 04/02/2024] [Indexed: 04/15/2024]
Abstract
Mulberry (Morus alba L.) is a climacteric and highly perishable fruit. Ethylene has been considered to be an important trigger of fruit ripening process. However, the role of ethylene in the mulberry fruit ripening process remains unclear. In this study, we performed a comprehensive analysis of metabolomic and transcriptomic data of mulberry fruit and the physiological changes accompanying the fruit ripening process. Our study revealed that changes in the accumulation of specific metabolites at different stages of fruit development and ripening were closely correlated to transcriptional changes as well as underlying physiological changes and the development of taste biomolecules. The ripening of mulberry fruits was highly associated with the production of endogenous ethylene, and further application of exogenous ethylene assisted the ripening process. Transcriptomic analysis revealed that differential expression of diverse ripening-related genes was involved in sugar metabolism, anthocyanin biosynthesis, and cell wall modification pathways. Network analysis of transcriptomics and metabolomics data revealed that many transcription factors and ripening-related genes were involved, among which ethylene-responsive transcription factor 3 (MaERF3) plays a crucial role in the ripening process. The role of MaERF3 in ripening was experimentally proven in a transient overexpression assay in apples. Our study indicates that ethylene plays a vital role in modulating mulberry fruit ripening. The results provide a basis for guiding the genetic manipulation of mulberry fruits towards sustainable agricultural practices and improve post-harvest management, potentially enhancing the quality and shelf life of mulberry fruits for sustainable agriculture and forestry.
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Affiliation(s)
- Zhichao Sun
- Sericultural Research Insitute, Chengde Medical University, Chengde 067000, China; State Key Laboratory of Subtropical Silviculture, College of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou 311300, China.
| | - Xinmiao Guo
- Chengde College of Applied Technology, Chengde 067000, China.
| | - R M Saravana Kumar
- Department of Biotechnology, Saveetha School of Engineering, Saveetha University, Chennai, Tamil Nadu 602105, India.
| | - Chunying Huang
- State Key Laboratory of Subtropical Silviculture, College of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou 311300, China.
| | - Yan Xie
- Sericultural Research Insitute, Chengde Medical University, Chengde 067000, China.
| | - Meng Li
- Sericultural Research Insitute, Chengde Medical University, Chengde 067000, China.
| | - Jisheng Li
- Sericultural Research Insitute, Chengde Medical University, Chengde 067000, China.
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2
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Zhang S, Wu S, Jia Z, Zhang J, Li Y, Ma X, Fan B, Wang P, Gao Y, Ye Z, Wang W. Exploring the influence of a single-nucleotide mutation in EIN4 on tomato fruit firmness diversity through fruit pericarp microstructure. PLANT BIOTECHNOLOGY JOURNAL 2024. [PMID: 38623687 DOI: 10.1111/pbi.14352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 02/04/2024] [Accepted: 03/29/2024] [Indexed: 04/17/2024]
Abstract
Tomato (Solanum lycopersicum) stands as one of the most valuable vegetable crops globally, and fruit firmness significantly impacts storage and transportation. To identify genes governing tomato firmness, we scrutinized the firmness of 266 accessions from core collections. Our study pinpointed an ethylene receptor gene, SlEIN4, located on chromosome 4 through a genome-wide association study (GWAS) of fruit firmness in the 266 tomato core accessions. A single-nucleotide polymorphism (SNP) (A → G) of SlEIN4 distinguished lower (AA) and higher (GG) fruit firmness genotypes. Through experiments, we observed that overexpression of SlEIN4AA significantly delayed tomato fruit ripening and dramatically reduced fruit firmness at the red ripe stage compared with the control. Conversely, gene editing of SlEIN4AA with CRISPR/Cas9 notably accelerated fruit ripening and significantly increased fruit firmness at the red ripe stage compared with the control. Further investigations revealed that fruit firmness is associated with alterations in the microstructure of the fruit pericarp. Additionally, SlEIN4AA positively regulates pectinase activity. The transient transformation assay verified that the SNP (A → G) on SlEIN4 caused different genetic effects, as overexpression of SlEIN4GG increased fruit firmness. Moreover, SlEIN4 exerts a negative regulatory role in tomato ripening by impacting ethylene evolution through the abundant expression of ethylene pathway regulatory genes. This study presents the first evidence of the role of ethylene receptor genes in regulating fruit firmness. These significant findings will facilitate the effective utilization of firmness and ripening traits in tomato improvement, offering promising opportunities for enhancing tomato storage and transportation capabilities.
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Affiliation(s)
- Shiwen Zhang
- College of Horticulture, Henan Agricultural University, Zhengzhou, China
- International Joint Laboratory of Henan Horticultural Crop Biology, Henan Agricultural University, Zhengzhou, China
| | - Shengqing Wu
- College of Horticulture, Henan Agricultural University, Zhengzhou, China
- International Joint Laboratory of Henan Horticultural Crop Biology, Henan Agricultural University, Zhengzhou, China
| | - Zhiqi Jia
- College of Horticulture, Henan Agricultural University, Zhengzhou, China
- International Joint Laboratory of Henan Horticultural Crop Biology, Henan Agricultural University, Zhengzhou, China
| | - Junhong Zhang
- Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Ying Li
- College of Horticulture, Henan Agricultural University, Zhengzhou, China
- International Joint Laboratory of Henan Horticultural Crop Biology, Henan Agricultural University, Zhengzhou, China
| | - Xingyun Ma
- College of Horticulture, Henan Agricultural University, Zhengzhou, China
- International Joint Laboratory of Henan Horticultural Crop Biology, Henan Agricultural University, Zhengzhou, China
| | - Bingli Fan
- College of Horticulture, Henan Agricultural University, Zhengzhou, China
- International Joint Laboratory of Henan Horticultural Crop Biology, Henan Agricultural University, Zhengzhou, China
| | - Panqiao Wang
- College of Horticulture, Henan Agricultural University, Zhengzhou, China
- International Joint Laboratory of Henan Horticultural Crop Biology, Henan Agricultural University, Zhengzhou, China
| | - Yanna Gao
- College of Horticulture, Henan Agricultural University, Zhengzhou, China
- International Joint Laboratory of Henan Horticultural Crop Biology, Henan Agricultural University, Zhengzhou, China
| | - Zhibiao Ye
- Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Wei Wang
- College of Horticulture, Henan Agricultural University, Zhengzhou, China
- International Joint Laboratory of Henan Horticultural Crop Biology, Henan Agricultural University, Zhengzhou, China
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3
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Baranov D, Timerbaev V. Recent Advances in Studying the Regulation of Fruit Ripening in Tomato Using Genetic Engineering Approaches. Int J Mol Sci 2024; 25:760. [PMID: 38255834 PMCID: PMC10815249 DOI: 10.3390/ijms25020760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 12/28/2023] [Accepted: 01/02/2024] [Indexed: 01/24/2024] Open
Abstract
Tomato (Solanum lycopersicum L.) is one of the most commercially essential vegetable crops cultivated worldwide. In addition to the nutritional value, tomato is an excellent model for studying climacteric fruits' ripening processes. Despite this, the available natural pool of genes that allows expanding phenotypic diversity is limited, and the difficulties of crossing using classical selection methods when stacking traits increase proportionally with each additional feature. Modern methods of the genetic engineering of tomatoes have extensive potential applications, such as enhancing the expression of existing gene(s), integrating artificial and heterologous gene(s), pointing changes in target gene sequences while keeping allelic combinations characteristic of successful commercial varieties, and many others. However, it is necessary to understand the fundamental principles of the gene molecular regulation involved in tomato fruit ripening for its successful use in creating new varieties. Although the candidate genes mediate ripening have been identified, a complete picture of their relationship has yet to be formed. This review summarizes the latest (2017-2023) achievements related to studying the ripening processes of tomato fruits. This work attempts to systematize the results of various research articles and display the interaction pattern of genes regulating the process of tomato fruit ripening.
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Affiliation(s)
- Denis Baranov
- Laboratory of Expression Systems and Plant Genome Modification, Branch of Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Science, 142290 Pushchino, Russia;
- Laboratory of Plant Genetic Engineering, All-Russia Research Institute of Agricultural Biotechnology, 127550 Moscow, Russia
| | - Vadim Timerbaev
- Laboratory of Expression Systems and Plant Genome Modification, Branch of Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Science, 142290 Pushchino, Russia;
- Laboratory of Plant Genetic Engineering, All-Russia Research Institute of Agricultural Biotechnology, 127550 Moscow, Russia
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4
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Fahad M, Altaf MT, Jamil A, Basit A, Aslam MM, Liaqat W, Shah MN, Ullah I, Mohamed HI. Functional characterization of transcriptional activator gene SIARRI in tomato reveals its role in fruit growth and ripening. Transgenic Res 2023; 32:77-93. [PMID: 36806962 DOI: 10.1007/s11248-023-00337-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Accepted: 01/27/2023] [Indexed: 02/23/2023]
Abstract
Auxins regulate several characteristics of plant development and growth. Here, we characterized a new transcriptional activator SIARRI which binds specific DNA sequences and was revealed in Arabidopsis (ARR1). SIARRI acts as a two-component response regulator and its Arabidopsis homologous gene is AT3G16857. It belongs to the subfamily of type-B response regulators in the cytokinin signaling pathway. The study aimed to characterize the transgenic Micro-Tom plants by the overexpression of Solanum lycopersicum two-component response regulator ARR1. Overexpression of SIARRI results in a pleiotropic phenotype during fruit development and ripening. This study indicates that SIARRI is a primary regulator of leaf morphology and fruit development. Moreover, overexpressed plants showed variations in growth related to auxin as well as shorter hypocotyl elongation, enlarged leaf vascularization, and decreased apical dominance. The qRT-PCR investigation revealed that expression was downregulated at the breaker stage and high at Br+6 at various stages of fruit growth and ripening. In contrast to the fruit color, lycopene and β-carotene concentrations in red-yellow overexpression line fruits were reduced significantly, and also slightly reduced in some red fruits. The quantity of β-carotene in the transgenic fruits was lower than that of lycopene. This study showed that this gene might be a new transcriptional activator in fruit development and ripening. Furthermore, this study will provide new insights into tomato fruit ripening.
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Affiliation(s)
- Muhammad Fahad
- College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Muhammad Tanveer Altaf
- Department of Plant Protection, Faculty of Agricultural Sciences and Technology, Sivas University of Science and Technology, 58140, Sivas, Turkey
| | - Amna Jamil
- Department of Horticulture, MNS University of Agriculture, Multan, 60000, Pakistan
| | - Abdul Basit
- Department of Horticulture, Faculty of Crop Production Sciences, The University of Agriculture Peshawar, Peshawar, 25120, Pakistan
| | - Muhammad Mudassir Aslam
- Department of Plant Breeding and Genetics, University College of Agriculture, Bahauddin Zakariya University, Multan, Pakistan
| | - Waqas Liaqat
- Department of Field Crops, Faculty of Agriculture, Institute of Natural and Applied Sciences, Çukurova University, 01330, Adana, Turkey
| | - Muhammad Nadeem Shah
- North Florida Research and Education Centre (NFREC), University of Florida, 155 Research Road, Quincy, FL, 32351, USA
| | - Izhar Ullah
- Department of Horticulture, Faculty of Agriculture, Ondokuz Mayis University, Samsun, Turkey
| | - Heba I Mohamed
- Department of Biological and Geological Sciences, Faculty of Education, Ain Shams University, Cairo, 11341, Egypt.
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5
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Kamiyoshihara Y, Achiha Y, Ishikawa S, Mizuno S, Mori H, Tateishi A, Huber DJ, Klee HJ. Heteromeric interactions of ripening-related ethylene receptors in tomato fruit. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:6773-6783. [PMID: 35863309 DOI: 10.1093/jxb/erac314] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 07/21/2022] [Indexed: 06/15/2023]
Abstract
Ripening of climacteric fruits is initiated when the gaseous plant hormone ethylene is perceived by the cell. Ethylene binding to membrane-associated ethylene receptors (ETRs) triggers a series of biochemical events through multiple components, resulting in the induction of numerous ripening-related genes. In tomato (Solanum lycopersicum L.), there are seven members of the ETR family, which each contribute to the regulation of fruit ripening. However, the relative contribution of each individual receptor to ethylene signaling remains unknown. Here, we demonstrated the formation of heteromeric receptor complexes across the two ETR subfamilies in tomato fruit. Immunoprecipitation of subfamily II SlETR4 resulted in co-purification of subfamily I (SlETR1, SlETR2, and SlETR3), but not subfamily II members (SlETR5, SlETR6, and SlETR7). Such biased interactions were verified in yeast two-hybrid assays, and in transgenic Arabidopsis plants, in which heterologous SlETR4 interacts with subfamily I ETRs. Our analysis also revealed that the receptor complexes engage the Raf-like protein kinases SlCTR1 and SlCTR3, which are potential regulators of signaling. Here, we suggest that tomato receptor members form heteromeric complexes to fine-tune signal output to the downstream pathway, which is similar to that of the Arabidopsis system but appears to be partially diverged.
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Affiliation(s)
- Yusuke Kamiyoshihara
- College of Bioresource Sciences, Nihon University, Kameino, Fujisawa, Kanagawa, Japan
- Graduate School of Bioresource Sciences, Nihon University, Kameino, Fujisawa, Kanagawa, Japan
| | - Yuki Achiha
- Graduate School of Bioresource Sciences, Nihon University, Kameino, Fujisawa, Kanagawa, Japan
| | - Shin Ishikawa
- College of Bioresource Sciences, Nihon University, Kameino, Fujisawa, Kanagawa, Japan
| | - Shinji Mizuno
- College of Bioresource Sciences, Nihon University, Kameino, Fujisawa, Kanagawa, Japan
- Graduate School of Bioresource Sciences, Nihon University, Kameino, Fujisawa, Kanagawa, Japan
| | - Hitoshi Mori
- Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Akira Tateishi
- College of Bioresource Sciences, Nihon University, Kameino, Fujisawa, Kanagawa, Japan
- Graduate School of Bioresource Sciences, Nihon University, Kameino, Fujisawa, Kanagawa, Japan
| | - Donald J Huber
- Horticultural Sciences, University of Florida, Gainesville, FL, USA
| | - Harry J Klee
- Horticultural Sciences, University of Florida, Gainesville, FL, USA
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6
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Wala M, Kołodziejek J, Wilk T. Acidity and availability of aluminum, iron and manganese as factors affecting germination in European acidic dry and alkaline xerothermic grasslands. PeerJ 2022; 10:e13255. [PMID: 35505676 PMCID: PMC9057293 DOI: 10.7717/peerj.13255] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 03/22/2022] [Indexed: 01/13/2023] Open
Abstract
Germination ecology of 10 species from acidic dry grasslands and 10 species from alkaline xerothermic grasslands was studied. The seeds were subjected to different pH, iron (Fe), manganese (Mn) and aluminum (Al) treatments under controlled conditions. Effects of ionic (chlorides) and chelated forms (HBED chelates) of Fe and Mn were also compared. Final germination percentage (FGP) and index of germination velocity (IGV) were calculated. The results indicate that pH and extremely high availability of Al are the major edaphic filters regulating germination-based revegetation, while availability of Fe and Mn is of the secondary importance. Both chelates and ionic forms of Fe and Mn exerted similar effects on the ability of seeds to complete germination. It suggests that both chelates are not hazardous for early ontogenetic stages of plants. Neither group has group-specific adaptations pertaining to germination characteristics in the context of the studied chemical stimuli, which indicates a diversity of germination strategies and individual species-specific reactions to the tested factors.
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Affiliation(s)
- Mateusz Wala
- Department of Geobotany and Plant Ecology, Faculty of Biology and Environmental Protection, University of Lodz, Łódź, Łódź Voivodeship, Poland
| | - Jeremi Kołodziejek
- Department of Geobotany and Plant Ecology, Faculty of Biology and Environmental Protection, University of Lodz, Łódź, Łódź Voivodeship, Poland
| | - Tomasz Wilk
- Przedsiębiorstwo Produkcyjno-Consultingowe ADOB Sp. z o.o. Sp. jawna, Poznań, Greater Poland Voivodeship, Poland,Faculty of Chemistry, Adam Mickiewicz University in Poznań, Poznań, Greater Poland Voivodeship, Poland
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7
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Luo S, Ma Q, Zhong Y, Jing J, Wei Z, Zhou W, Lu X, Tian Y, Zhang P. Editing of the starch branching enzyme gene SBE2 generates high-amylose storage roots in cassava. PLANT MOLECULAR BIOLOGY 2022; 106:67-84. [PMID: 34792751 DOI: 10.1007/s11103-021-01130-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 02/09/2021] [Indexed: 05/25/2023]
Abstract
The production of high-amylose cassava through CRISPR/Cas9-mediated mutagenesis of the starch branching enzyme gene SBE2 was firstly achieved. High-amylose cassava (Manihot esculenta Crantz) is desirable for starch industrial applications and production of healthier processed food for human consumption. In this study, we report the production of high-amylose cassava through CRISPR/Cas9-mediated mutagenesis of the starch branching enzyme 2 (SBE2). Mutations in two targeted exons of SBE2 were identified in all regenerated plants; these mutations, which included nucleotide insertions, and short or long deletions in the SBE2 gene, were classified into eight mutant lines. Three mutants, M6, M7 and M8, with long fragment deletions in the second exon of SBE2 showed no accumulation of SBE2 protein. After harvest from the field, significantly higher amylose (up to 56% in apparent amylose content) and resistant starch (up to 35%) was observed in these mutants compared with the wild type, leading to darker blue coloration of starch granules after quick iodine staining and altered starch viscosity with a higher pasting temperature and peak time. Further 1H-NMR analysis revealed a significant reduction in the degree of starch branching, together with fewer short chains (degree of polymerization [DP] 15-25) and more long chains (DP>25 and especially DP>40) of amylopectin, which indicates that cassava SBE2 catalyzes short chain formation during amylopectin biosynthesis. Transition from A- to B-type crystallinity was also detected in the starches. Our study showed that CRISPR/Cas9-mediated mutagenesis of starch biosynthetic genes in cassava is an effective approach for generating novel varieties with valuable starch properties for food and industrial applications.
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Affiliation(s)
- Shu Luo
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Qiuxiang Ma
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 200032, China.
| | - Yingying Zhong
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
- Shanghai Sanshu Biotechnology Co., LTD, Shanghai, 201210, China
| | - Jianling Jing
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
| | - Zusheng Wei
- Guangxi Subtropical Crops Research Institute, Nanning, 530001, China
| | - Wenzhi Zhou
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
- Shanghai Sanshu Biotechnology Co., LTD, Shanghai, 201210, China
| | - Xinlu Lu
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
| | - Yinong Tian
- Guangxi Subtropical Crops Research Institute, Nanning, 530001, China
| | - Peng Zhang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 200032, China.
- University of Chinese Academy of Sciences, Beijing, China.
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8
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Zameer R, Sadaqat M, Fatima K, Fiaz S, Rasul S, Zafar H, Qayyum A, Nashat N, Raza A, Shah AN, Batool R, Azeem F, Sun S, Chung G. Two-Component System Genes in Sorghum bicolor: Genome-Wide Identification and Expression Profiling in Response to Environmental Stresses. Front Genet 2021; 12:794305. [PMID: 34899869 PMCID: PMC8655132 DOI: 10.3389/fgene.2021.794305] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 11/08/2021] [Indexed: 12/31/2022] Open
Abstract
The two-component signal transduction system (TCS) acts in a variety of physiological processes in lower organisms and has emerged as a key signaling system in both prokaryotes and eukaryotes, including plants. TCS genes assist plants in processes such as stress resistance, cell division, nutrition signaling, leaf senescence, and chloroplast division. In plants, this system is composed of three types of proteins: response regulators (RRs), histidine kinases (HKs), and histidine phosphotransfer proteins (HPs). We aimed to study the Sorghum bicolor genome and identified 37 SbTCS genes consisting of 13 HKs, 5 HPs, and 19 RRs (3 type-A RRs, 7 type-B RRs, 2 type-C RRs, and 7 pseudo-RRs). The structural and phylogenetic comparison of the SbTCS members with their counterparts in Arabidopsis thaliana, Oryza sativa, Cicer arietinum, and Glycine max showed group-specific conservations and variations. Expansion of the gene family members is mostly a result of gene duplication, of both the tandem and segmental types. HKs and RRs were observed to be originated from segmental duplication, while some HPs originated from tandem duplication. The nuclear genome of S. bicolor contain 10 chromosomes and these SbTCS genes are randomly distributed on all the chromosomes. The promoter sequences of the SbTCS genes contain several abiotic stress-related cis-elements. RNA-seq and qRT-PCR-based expression analysis demonstrated most of the TCS genes were responsive to drought and salt stresses in leaves, which suggest their role in leaf development. This study lays a foundation for further functional study of TCS genes for stress tolerance and developmental improvement in S. bicolor.
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Affiliation(s)
- Roshan Zameer
- Department of Bioinformatics and Biotechnology, Government College University, Faisalabad, Pakistan
| | - Muhammad Sadaqat
- Department of Bioinformatics and Biotechnology, Government College University, Faisalabad, Pakistan
| | - Kinza Fatima
- Department of Bioinformatics and Biotechnology, Government College University, Faisalabad, Pakistan
| | - Sajid Fiaz
- Department of Plant Breeding and Genetics, The University of Haripur, Haripur, Pakistan
| | - Sumaira Rasul
- Institute of Molecular Biology and Bio-Technology, Bahauddin Zakariya University, Multan, Pakistan
| | - Hadeqa Zafar
- Nuclear Institute for Agriculture and Biology, Faisalabad, Pakistan
| | - Abdul Qayyum
- Department of Agronomy, The University of Haripur, Haripur, Pakistan
| | - Naima Nashat
- Department of Biochemistry, University of Agriculture, Faisalabad, Pakistan
| | - Ali Raza
- Fujian Provincial Key Laboratory of Crop Molecular and Cell Biology, Oil Crops Research Institute, Center of Legume Crop Genetics and Systems Biology, College of Agriculture, Fujian Agriculture and Forestry University (FAFU), Fuzhou, China
| | - Adnan Noor Shah
- Department of Agricultural Engineering, Khwaja Fareed University of Engineering and Information Technology, Rahim Yar Khan, Pakistan
| | - Riffat Batool
- Department of Botany, GC Women University, Faisalabad, Pakistan
| | - Farrukh Azeem
- Department of Bioinformatics and Biotechnology, Government College University, Faisalabad, Pakistan
| | - Sangmi Sun
- Department of Biotechnology, Chonnam National University, Yeosu, South Korea
| | - Gyuhwa Chung
- Department of Biotechnology, Chonnam National University, Yeosu, South Korea
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9
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Kou X, Feng Y, Yuan S, Zhao X, Wu C, Wang C, Xue Z. Different regulatory mechanisms of plant hormones in the ripening of climacteric and non-climacteric fruits: a review. PLANT MOLECULAR BIOLOGY 2021; 107:477-497. [PMID: 34633626 DOI: 10.1007/s11103-021-01199-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 09/24/2021] [Indexed: 05/24/2023]
Abstract
This review contains the regulatory mechanisms of plant hormones in the ripening process of climacteric and non-climacteric fruits, interactions between plant hormones and future research directions. The fruit ripening process involves physiological and biochemical changes such as pigment accumulation, softening, aroma and flavor formation. There is a great difference in the ripening process between climacteric fruits and non-climacteric fruits. The ripening of these two types of fruits is affected by endogenous signals and exogenous environments. Endogenous signaling plant hormones play an important regulatory role in fruit ripening. This paper systematically reviews recent progress in the regulation of plant hormones in fruit ripening, including ethylene, abscisic acid, auxin, jasmonic acid (JA), gibberellin, brassinosteroid (BR), salicylic acid (SA) and melatonin. The role of plant hormones in both climacteric and non-climacteric fruits is discussed, with emphasis on the interaction between ethylene and other adjustment factors. Specifically, the research progress and future research directions of JA, SA and BR in fruit ripening are discussed, and the regulatory network between JA and other signaling molecules remains to be further revealed. This study is meant to expand the understanding of the importance of plant hormones, clarify the hormonal regulation network and provide a basis for targeted manipulation of fruit ripening.
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Affiliation(s)
- Xiaohong Kou
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
| | - Yuan Feng
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
| | - Shuai Yuan
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
| | - Xiaoyang Zhao
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
| | - Caie Wu
- College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, 210037, People's Republic of China
| | - Chao Wang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
| | - Zhaohui Xue
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China.
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10
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Huang B, Hu G, Wang K, Frasse P, Maza E, Djari A, Deng W, Pirrello J, Burlat V, Pons C, Granell A, Li Z, van der Rest B, Bouzayen M. Interaction of two MADS-box genes leads to growth phenotype divergence of all-flesh type of tomatoes. Nat Commun 2021; 12:6892. [PMID: 34824241 PMCID: PMC8616914 DOI: 10.1038/s41467-021-27117-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Accepted: 11/02/2021] [Indexed: 12/19/2022] Open
Abstract
All-flesh tomato cultivars are devoid of locular gel and exhibit enhanced firmness and improved postharvest storage. Here, we show that SlMBP3 is a master regulator of locular tissue in tomato fruit and that a deletion at the gene locus underpins the All-flesh trait. Intriguingly, All-flesh varieties lack the deleterious phenotypes reported previously for SlMBP3 under-expressing lines and which preclude any potential commercial use. We resolve the causal factor for this phenotypic divergence through the discovery of a natural mutation at the SlAGL11 locus, a close homolog of SlMBP3. Misexpressing SlMBP3 impairs locular gel formation through massive transcriptomic reprogramming at initial phases of fruit development. SlMBP3 influences locule gel formation by controlling cell cycle and cell expansion genes, indicating that important components of fruit softening are determined at early pre-ripening stages. Our findings define potential breeding targets for improved texture in tomato and possibly other fleshy fruits.
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Affiliation(s)
- Baowen Huang
- grid.508721.9Université de Toulouse, INRAe/INP Toulouse, UMR990 Génomique et Biotechnologie des Fruits, Avenue de l’Agrobiopole, Castanet-Tolosan, F-31326 France ,grid.15781.3a0000 0001 0723 035XLaboratoire de Recherche en Sciences Végétales - UMR5546, Université de Toulouse, CNRS, UPS, Toulouse, INP France
| | - Guojian Hu
- grid.508721.9Université de Toulouse, INRAe/INP Toulouse, UMR990 Génomique et Biotechnologie des Fruits, Avenue de l’Agrobiopole, Castanet-Tolosan, F-31326 France ,grid.15781.3a0000 0001 0723 035XLaboratoire de Recherche en Sciences Végétales - UMR5546, Université de Toulouse, CNRS, UPS, Toulouse, INP France
| | - Keke Wang
- grid.508721.9Université de Toulouse, INRAe/INP Toulouse, UMR990 Génomique et Biotechnologie des Fruits, Avenue de l’Agrobiopole, Castanet-Tolosan, F-31326 France ,grid.15781.3a0000 0001 0723 035XLaboratoire de Recherche en Sciences Végétales - UMR5546, Université de Toulouse, CNRS, UPS, Toulouse, INP France
| | - Pierre Frasse
- grid.508721.9Université de Toulouse, INRAe/INP Toulouse, UMR990 Génomique et Biotechnologie des Fruits, Avenue de l’Agrobiopole, Castanet-Tolosan, F-31326 France ,grid.15781.3a0000 0001 0723 035XLaboratoire de Recherche en Sciences Végétales - UMR5546, Université de Toulouse, CNRS, UPS, Toulouse, INP France
| | - Elie Maza
- grid.508721.9Université de Toulouse, INRAe/INP Toulouse, UMR990 Génomique et Biotechnologie des Fruits, Avenue de l’Agrobiopole, Castanet-Tolosan, F-31326 France ,grid.15781.3a0000 0001 0723 035XLaboratoire de Recherche en Sciences Végétales - UMR5546, Université de Toulouse, CNRS, UPS, Toulouse, INP France
| | - Anis Djari
- grid.508721.9Université de Toulouse, INRAe/INP Toulouse, UMR990 Génomique et Biotechnologie des Fruits, Avenue de l’Agrobiopole, Castanet-Tolosan, F-31326 France ,grid.15781.3a0000 0001 0723 035XLaboratoire de Recherche en Sciences Végétales - UMR5546, Université de Toulouse, CNRS, UPS, Toulouse, INP France
| | - Wei Deng
- grid.190737.b0000 0001 0154 0904Key Laboratory of Plant Hormones and Development Regulation of Chongqing, School of Life Sciences, Chongqing University, 401331 Chongqing, China
| | - Julien Pirrello
- grid.508721.9Université de Toulouse, INRAe/INP Toulouse, UMR990 Génomique et Biotechnologie des Fruits, Avenue de l’Agrobiopole, Castanet-Tolosan, F-31326 France ,grid.15781.3a0000 0001 0723 035XLaboratoire de Recherche en Sciences Végétales - UMR5546, Université de Toulouse, CNRS, UPS, Toulouse, INP France
| | - Vincent Burlat
- grid.15781.3a0000 0001 0723 035XLaboratoire de Recherche en Sciences Végétales - UMR5546, Université de Toulouse, CNRS, UPS, Toulouse, INP France
| | - Clara Pons
- grid.4711.30000 0001 2183 4846Instituto de Biología Molecular y Cellular de Plantas, Consejo Superior de Investigaciones Cientificas- Universidad Politécnica de Valencia, 46022 Valencia, Spain
| | - Antonio Granell
- grid.4711.30000 0001 2183 4846Instituto de Biología Molecular y Cellular de Plantas, Consejo Superior de Investigaciones Cientificas- Universidad Politécnica de Valencia, 46022 Valencia, Spain
| | - Zhengguo Li
- Key Laboratory of Plant Hormones and Development Regulation of Chongqing, School of Life Sciences, Chongqing University, 401331, Chongqing, China. .,Center of Plant Functional Genomics, Institute of Advanced Interdisciplinary Studies, Chongqing University, 401331, Chongqing, China.
| | - Benoît van der Rest
- Université de Toulouse, INRAe/INP Toulouse, UMR990 Génomique et Biotechnologie des Fruits, Avenue de l'Agrobiopole, Castanet-Tolosan, F-31326, France. .,Laboratoire de Recherche en Sciences Végétales - UMR5546, Université de Toulouse, CNRS, UPS, Toulouse, INP, France.
| | - Mondher Bouzayen
- Université de Toulouse, INRAe/INP Toulouse, UMR990 Génomique et Biotechnologie des Fruits, Avenue de l'Agrobiopole, Castanet-Tolosan, F-31326, France. .,Laboratoire de Recherche en Sciences Végétales - UMR5546, Université de Toulouse, CNRS, UPS, Toulouse, INP, France. .,Center of Plant Functional Genomics, Institute of Advanced Interdisciplinary Studies, Chongqing University, 401331, Chongqing, China.
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11
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Althiab-Almasaud R, Chen Y, Maza E, Djari A, Frasse P, Mollet JC, Mazars C, Jamet E, Chervin C. Ethylene signaling modulates tomato pollen tube growth through modifications of cell wall remodeling and calcium gradient. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2021; 107:893-908. [PMID: 34036648 DOI: 10.1111/tpj.15353] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 05/14/2021] [Accepted: 05/18/2021] [Indexed: 06/12/2023]
Abstract
Ethylene modulates plant developmental processes including flower development. Previous studies have suggested ethylene participates in pollen tube (PT) elongation, and both ethylene production and perception seem critical at the time of fertilization. The full gene set regulated by ethylene during PT growth is unknown. To study this, we used various EThylene Receptor (ETR) tomato (Solanum lycopersicum) mutants: etr3-ko, a loss-of-function (LOF) mutant; and NR (NEVER RIPE), a gain-of-function (GOF) mutant. The etr3-ko PTs grew faster than wild-type (WT) PTs. Oppositely, NR PT elongation was slower than in WT, and PTs displayed larger diameters. ETR mutations result in feedback control of ethylene production. Furthermore, ethylene treatment of germinating pollen grains increased PT length in etr-ko mutants and WT, but not in NR. Treatment with the ethylene perception inhibitor 1-methylcyclopropene decreased PT length in etr-ko mutants and WT, but had no effect on NR. This confirmed that ethylene regulates PT growth. The comparison of PT transcriptomes in LOF and GOF mutants, etr3-ko and NR, both harboring mutations of the ETR3 gene, revealed that ethylene perception has major impacts on cell wall- and calcium-related genes as confirmed by microscopic observations showing a modified distribution of the methylesterified homogalacturonan pectic motif and of calcium load. Our results establish links between PT growth, ethylene, calcium, and cell wall metabolism, and also constitute a transcriptomic resource.
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Affiliation(s)
- Rasha Althiab-Almasaud
- Laboratoire de Génomique et Biotechnologie des Fruits, Université de Toulouse, Toulouse INP-ENSAT, INRAE, Auzeville-Tolosane, France
| | - Yi Chen
- Laboratoire de Génomique et Biotechnologie des Fruits, Université de Toulouse, Toulouse INP-ENSAT, INRAE, Auzeville-Tolosane, France
- College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, China
| | - Elie Maza
- Laboratoire de Génomique et Biotechnologie des Fruits, Université de Toulouse, Toulouse INP-ENSAT, INRAE, Auzeville-Tolosane, France
| | - Anis Djari
- Laboratoire de Génomique et Biotechnologie des Fruits, Université de Toulouse, Toulouse INP-ENSAT, INRAE, Auzeville-Tolosane, France
| | - Pierre Frasse
- Laboratoire de Génomique et Biotechnologie des Fruits, Université de Toulouse, Toulouse INP-ENSAT, INRAE, Auzeville-Tolosane, France
| | - Jean-Claude Mollet
- Laboratoire Glyco-MEV, SFR NORVEGE, Innovation Chimie Carnot, Normandie Univ, UniRouen, Rouen, France
| | - Christian Mazars
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, CNRS, UPS, Auzeville-Tolosane, France
| | - Elisabeth Jamet
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, CNRS, UPS, Auzeville-Tolosane, France
| | - Christian Chervin
- Laboratoire de Génomique et Biotechnologie des Fruits, Université de Toulouse, Toulouse INP-ENSAT, INRAE, Auzeville-Tolosane, France
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12
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Hoang XLT, Prerostova S, Thu NBA, Thao NP, Vankova R, Tran LSP. Histidine Kinases: Diverse Functions in Plant Development and Responses to Environmental Conditions. ANNUAL REVIEW OF PLANT BIOLOGY 2021; 72:297-323. [PMID: 34143645 DOI: 10.1146/annurev-arplant-080720-093057] [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: 05/23/2023]
Abstract
The two-component system (TCS), which is one of the most evolutionarily conserved signaling pathway systems, has been known to regulate multiple biological activities and environmental responses in plants. Significant progress has been made in characterizing the biological functions of the TCS components, including signal receptor histidine kinase (HK) proteins, signal transducer histidine-containing phosphotransfer proteins, and effector response regulator proteins. In this review, our scope is focused on the diverse structure, subcellular localization, and interactions of the HK proteins, as well as their signaling functions during development and environmental responses across different plant species. Based on data collected from scientific studies, knowledge about acting mechanisms and regulatory roles of HK proteins is presented. This comprehensive summary ofthe HK-related network provides a panorama of sophisticated modulating activities of HK members and gaps in understanding these activities, as well as the basis for developing biotechnological strategies to enhance the quality of crop plants.
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Affiliation(s)
- Xuan Lan Thi Hoang
- Applied Biotechnology for Crop Development Research Unit, School of Biotechnology, International University, Ho Chi Minh City 700000, Vietnam; , ,
- Vietnam National University, Ho Chi Minh City 700000, Vietnam
| | - Sylva Prerostova
- Laboratory of Hormonal Regulations in Plants, Institute of Experimental Botany, Czech Academy of Sciences, 165 02 Prague 6, Czech Republic; ,
| | - Nguyen Binh Anh Thu
- Applied Biotechnology for Crop Development Research Unit, School of Biotechnology, International University, Ho Chi Minh City 700000, Vietnam; , ,
- Vietnam National University, Ho Chi Minh City 700000, Vietnam
| | - Nguyen Phuong Thao
- Applied Biotechnology for Crop Development Research Unit, School of Biotechnology, International University, Ho Chi Minh City 700000, Vietnam; , ,
- Vietnam National University, Ho Chi Minh City 700000, Vietnam
| | - Radomira Vankova
- Laboratory of Hormonal Regulations in Plants, Institute of Experimental Botany, Czech Academy of Sciences, 165 02 Prague 6, Czech Republic; ,
| | - Lam-Son Phan Tran
- Institute of Genomics for Crop Abiotic Stress Tolerance, Department of Plant and Soil Science, Texas Tech University, Lubbock, Texas 79409, USA;
- Stress Adaptation Research Unit, RIKEN Center for Sustainable Resource Science, Tsurumi, Yokohama 230-0045, Japan
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13
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Hang T, Ling X, He C, Xie S, Jiang H, Ding T. Isolation of the ZmERS4 Gene From Maize and Its Functional Analysis in Transgenic Plants. Front Microbiol 2021; 12:632908. [PMID: 33776962 PMCID: PMC7994261 DOI: 10.3389/fmicb.2021.632908] [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: 11/25/2020] [Accepted: 02/15/2021] [Indexed: 11/24/2022] Open
Abstract
A gene encoding a protein similar to ethylene receptor was isolated from maize (Zea mays L.), which was named as ZmERS4.The gene was 1,905 bp in length with an open reading frame that encoded a protein consisting of 634 amino acids. The homologous analysis showed that ZmERS4 shared high similarity with the ethylene receptor protein, OsERS1, from rice (Oryza sativa L.). ZmERS4 grouped into the ETR1 subfamily of ethylene receptors based on its conserved domain and phylogenetic status. Tissue-specific and induced expression analyses indicated that ZmERS4 was differentially expressed in maize tissues, predominantly in the stems and leaves, and was induced by salicylic acid (SA). Overexpression of ZmERS4 in Arabidopsis improved resistance against the bacterial pathogen, PstDC3000, by inducing the expression of SA signaling-related genes. Moreover, treatment with flg22 induced the expression of the defense-related gene, PR1, in maize protoplasts that transiently expressed ZmERS4. Furthermore, the ultra-high-performance liquid chromatography (UPLC) analysis showed that the SA contents in ZmERS4-overexpressing Arabidopsis lines were significantly higher than the control lines. Additionally, the improved resistance of ZmERS4-overexpressing Arabidopsis against PstDC3000 was blocked after pretreatment with the SA biosynthetic inhibitor, ABT. Based on the collective findings, we hypothesize that ZmERS4 plays an important role in disease resistance through SA-mediated signaling pathways.
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Affiliation(s)
- Tianlu Hang
- National Engineering Laboratory of Crop Stress Resistance Breeding, School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Xuezhi Ling
- National Engineering Laboratory of Crop Stress Resistance Breeding, School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Cheng He
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, Key Laboratory of Biology and Sustainable Management of Plant Diseases and Pests of Anhui Higher Education Institutes, School of Plant Protection, Anhui Agricultural University, Hefei, China
| | - Shanshan Xie
- National Engineering Laboratory of Crop Stress Resistance Breeding, School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Haiyang Jiang
- National Engineering Laboratory of Crop Stress Resistance Breeding, School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Ting Ding
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, Key Laboratory of Biology and Sustainable Management of Plant Diseases and Pests of Anhui Higher Education Institutes, School of Plant Protection, Anhui Agricultural University, Hefei, China
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14
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Riyazuddin R, Verma R, Singh K, Nisha N, Keisham M, Bhati KK, Kim ST, Gupta R. Ethylene: A Master Regulator of Salinity Stress Tolerance in Plants. Biomolecules 2020; 10:E959. [PMID: 32630474 PMCID: PMC7355584 DOI: 10.3390/biom10060959] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 06/22/2020] [Accepted: 06/22/2020] [Indexed: 12/21/2022] Open
Abstract
Salinity stress is one of the major threats to agricultural productivity across the globe. Research in the past three decades, therefore, has focused on analyzing the effects of salinity stress on the plants. Evidence gathered over the years supports the role of ethylene as a key regulator of salinity stress tolerance in plants. This gaseous plant hormone regulates many vital cellular processes starting from seed germination to photosynthesis for maintaining the plants' growth and yield under salinity stress. Ethylene modulates salinity stress responses largely via maintaining the homeostasis of Na+/K+, nutrients, and reactive oxygen species (ROS) by inducing antioxidant defense in addition to elevating the assimilation of nitrates and sulfates. Moreover, a cross-talk of ethylene signaling with other phytohormones has also been observed, which collectively regulate the salinity stress responses in plants. The present review provides a comprehensive update on the prospects of ethylene signaling and its cross-talk with other phytohormones to regulate salinity stress tolerance in plants.
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Affiliation(s)
- Riyazuddin Riyazuddin
- Department of Plant Biology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary;
- Doctoral School in Biology, Faculty of Science and Informatics, University of Szeged, H-6720 Szeged, Hungary
| | - Radhika Verma
- Department of Biotechnology, Visva-Bharati Central University, Santiniketan, West Bengal 731235, India;
| | - Kalpita Singh
- School of Biotechnology, Gautam Buddha University, Greater Noida, Uttar Pradesh 201312, India;
| | - Nisha Nisha
- Department of Integrated Plant Protection, Plant Protection Institute, Faculty of Horticultural Sciences, Szent István University, Páter Károly utca 1, H-2100 Gödöllo, Hungary;
| | - Monika Keisham
- Department of Botany, University of Delhi, New Delhi 110007, India;
| | - Kaushal Kumar Bhati
- Louvain Institute of Biomolecular Science, Catholic University of Louvain, B-1348 Louvain-la-Neuve, Belgium;
| | - Sun Tae Kim
- Department of Plant Bioscience, Pusan National University, Miryang 50463, Korea
| | - Ravi Gupta
- Department of Botany, School of Chemical and Life Sciences, Jamia Hamdard, Hamdard Nagar, New Delhi 110062, India
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15
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Abstract
Ethylene is a gaseous phytohormone and the first of this hormone class to be discovered. It is the simplest olefin gas and is biosynthesized by plants to regulate plant development, growth, and stress responses via a well-studied signaling pathway. One of the earliest reported responses to ethylene is the triple response. This response is common in eudicot seedlings grown in the dark and is characterized by reduced growth of the root and hypocotyl, an exaggerated apical hook, and a thickening of the hypocotyl. This proved a useful assay for genetic screens and enabled the identification of many components of the ethylene-signaling pathway. These components include a family of ethylene receptors in the membrane of the endoplasmic reticulum (ER); a protein kinase, called constitutive triple response 1 (CTR1); an ER-localized transmembrane protein of unknown biochemical activity, called ethylene-insensitive 2 (EIN2); and transcription factors such as EIN3, EIN3-like (EIL), and ethylene response factors (ERFs). These studies led to a linear model, according to which in the absence of ethylene, its cognate receptors signal to CTR1, which inhibits EIN2 and prevents downstream signaling. Ethylene acts as an inverse agonist by inhibiting its receptors, resulting in lower CTR1 activity, which releases EIN2 inhibition. EIN2 alters transcription and translation, leading to most ethylene responses. Although this canonical pathway is the predominant signaling cascade, alternative pathways also affect ethylene responses. This review summarizes our current understanding of ethylene signaling, including these alternative pathways, and discusses how ethylene signaling has been manipulated for agricultural and horticultural applications.
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Affiliation(s)
- Brad M Binder
- Department of Biochemistry and Cellular & Molecular Biology, University of Tennessee, Knoxville, Tennessee, USA
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