1
|
Ma X, Liu JN, Yan L, Liang Q, Fang H, Wang C, Dong Y, Chai Z, Zhou R, Bao Y, Hou W, Yang KQ, Wu D. Comparative Transcriptome Analysis Unravels Defense Pathways of Fraxinus velutina Torr Against Salt Stress. Front Plant Sci 2022; 13:842726. [PMID: 35310642 PMCID: PMC8931533 DOI: 10.3389/fpls.2022.842726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Accepted: 01/17/2022] [Indexed: 05/03/2023]
Abstract
Fraxinus velutina Torr with high salt tolerance has been widely grown in saline lands in the Yellow River Delta, China. However, the salt-tolerant mechanisms of F. velutina remain largely elusive. Here, we identified two contrasting cutting clones of F. velutina, R7 (salt-tolerant), and S4 (salt-sensitive) by measuring chlorophyll fluorescence characteristics (Fv/Fm ratio) in the excised leaves and physiological indexes in roots or leaves under salt treatment. To further explore the salt resistance mechanisms, we compared the transcriptomes of R7 and S4 from leaf and root tissues exposed to salt stress. The results showed that when the excised leaves of S4 and R7 were, respectively, exposed to 250 mM NaCl for 48 h, Fv/Fm ratio decreased significantly in S4 compared with R7, confirming that R7 is more tolerant to salt stress. Comparative transcriptome analysis showed that salt stress induced the significant upregulation of stress-responsive genes in R7, making important contributions to the high salt tolerance. Specifically, in the R7 leaves, salt stress markedly upregulated key genes involved in plant hormone signaling and mitogen-activated protein kinase signaling pathways; in the R7 roots, salt stress induced the upregulation of main genes involved in proline biosynthesis and starch and sucrose metabolism. In addition, 12 genes encoding antioxidant enzyme peroxidase were all significantly upregulated in both leaves and roots. Collectively, our findings revealed the crucial defense pathways underlying high salt tolerance of R7 through significant upregulation of some key genes involving metabolism and hub signaling pathways, thus providing novel insights into salt-tolerant F. velutina breeding.
Collapse
Affiliation(s)
- Xinmei Ma
- College of Forestry, Shandong Agricultural University, Tai’an, China
| | - Jian Ning Liu
- College of Forestry, Shandong Agricultural University, Tai’an, China
| | - Liping Yan
- Shandong Provincial Academy of Forestry, Jinan, China
| | - Qiang Liang
- College of Forestry, Shandong Agricultural University, Tai’an, China
- State Forestry and Grassland Administration Key Laboratory of Silviculture in the Downstream Areas of the Yellow River, Shandong Agricultural University, Tai’an, China
- Shandong Taishan Forest Ecosystem Research Station, Shandong Agricultural University, Tai’an, China
| | - Hongcheng Fang
- College of Forestry, Shandong Agricultural University, Tai’an, China
- State Forestry and Grassland Administration Key Laboratory of Silviculture in the Downstream Areas of the Yellow River, Shandong Agricultural University, Tai’an, China
- Shandong Taishan Forest Ecosystem Research Station, Shandong Agricultural University, Tai’an, China
| | - Changxi Wang
- College of Forestry, Shandong Agricultural University, Tai’an, China
| | - Yuhui Dong
- College of Forestry, Shandong Agricultural University, Tai’an, China
- State Forestry and Grassland Administration Key Laboratory of Silviculture in the Downstream Areas of the Yellow River, Shandong Agricultural University, Tai’an, China
- Shandong Taishan Forest Ecosystem Research Station, Shandong Agricultural University, Tai’an, China
| | - Zejia Chai
- College of Forestry, Shandong Agricultural University, Tai’an, China
| | - Rui Zhou
- College of Forestry, Shandong Agricultural University, Tai’an, China
| | - Yan Bao
- College of Forestry, Shandong Agricultural University, Tai’an, China
| | - Wenrui Hou
- College of Forestry, Shandong Agricultural University, Tai’an, China
| | - Ke Qiang Yang
- College of Forestry, Shandong Agricultural University, Tai’an, China
- State Forestry and Grassland Administration Key Laboratory of Silviculture in the Downstream Areas of the Yellow River, Shandong Agricultural University, Tai’an, China
- Shandong Taishan Forest Ecosystem Research Station, Shandong Agricultural University, Tai’an, China
- *Correspondence: Ke Qiang Yang,
| | - Dejun Wu
- Shandong Provincial Academy of Forestry, Jinan, China
- Dejun Wu,
| |
Collapse
|
2
|
Santosh Kumar VV, Yadav SK, Verma RK, Shrivastava S, Ghimire O, Pushkar S, Rao MV, Senthil Kumar T, Chinnusamy V. The abscisic acid receptor OsPYL6 confers drought tolerance to indica rice through dehydration avoidance and tolerance mechanisms. J Exp Bot 2021; 72:1411-1431. [PMID: 33130892 DOI: 10.1093/jxb/eraa509] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Accepted: 10/27/2020] [Indexed: 06/11/2023]
Abstract
Abscisic acid (ABA) is a key regulator of plant development and stress tolerance. Here we report functional validation of the ABA receptor OsPYL6 by constitutive and stress-inducible overexpression and RNAi silencing, in an indica rice cultivar 'Pusa Sugandh 2'. Overexpression of OsPYL6 conferred ABA hypersensitivity during germination and promoted total root length. Overexpression and RNAi silencing of OsPYL6 resulted in enhanced accumulation of ABA in seedlings under non-stress conditions, at least, in part through up-regulation of different 9-cis epoxycarotenoid dioxygenase (NCED )genes. This suggests that PYL6 expression is crucial for ABA homeostasis. Analysis of drought tolerance of OsPYL6 transgenic and wild type plants showed that OsPYL6 overexpression enhanced the expression of stress-responsive genes and dehydration tolerance. Transgenic rice plants overexpressing OsPYL6 with AtRD29A (Arabidopsis thaliana Responsive to Dehydration 29A) promoter also exhibited about 25% less whole plant transpiration, compared with wild type plants under drought, confirming its role in activation of dehydration avoidance mechanisms. However, overexpression of PYL6 reduced grain yield under non-stress conditions due to reduction in height, biomass, panicle branching and spikelet fertility. RNAi silencing of OsPYL6 also reduced grain yield under drought. These results showed that rice OsPYL6 is a key regulator of plant development and drought tolerance, and fine-tuning of its expression is critical for improving yield and stress tolerance.
Collapse
Affiliation(s)
- V V Santosh Kumar
- Division of Plant physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
- Department of Botany, Bharthidasan University, Tiruchirappalli, Tamil Nadu, India
| | - Shashank Kumar Yadav
- Division of Plant physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Rakesh Kumar Verma
- Division of Plant physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
- Department of Botany, Bharthidasan University, Tiruchirappalli, Tamil Nadu, India
| | - Sanya Shrivastava
- Division of Plant physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Omprakash Ghimire
- Division of Plant physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Suchitra Pushkar
- Division of Plant physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | | | | | - Viswanathan Chinnusamy
- Division of Plant physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| |
Collapse
|
3
|
Hoang NV, Park C, Kamran M, Lee JY. Gene Regulatory Network Guided Investigations and Engineering of Storage Root Development in Root Crops. Front Plant Sci 2020; 11:762. [PMID: 32625220 PMCID: PMC7313660 DOI: 10.3389/fpls.2020.00762] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 05/13/2020] [Indexed: 05/23/2023]
Abstract
The plasticity of plant development relies on its ability to balance growth and stress resistance. To do this, plants have established highly coordinated gene regulatory networks (GRNs) of the transcription factors and signaling components involved in developmental processes and stress responses. In root crops, yields of storage roots are mainly determined by secondary growth driven by the vascular cambium. In relation to this, a dynamic yet intricate GRN should operate in the vascular cambium, in coordination with environmental changes. Despite the significance of root crops as food sources, GRNs wired to mediate secondary growth in the storage root have just begun to emerge, specifically with the study of the radish. Gene expression data available with regard to other important root crops are not detailed enough for us directly to infer underlying molecular mechanisms. Thus, in this review, we provide a general overview of the regulatory programs governing the development and functions of the vascular cambium in model systems, and the role of the vascular cambium on the growth and yield potential of the storage roots in root crops. We then undertake a reanalysis of recent gene expression data generated for major root crops and discuss common GRNs involved in the vascular cambium-driven secondary growth in storage roots using the wealth of information available in Arabidopsis. Finally, we propose future engineering schemes for improving root crop yields by modifying potential key nodes in GRNs.
Collapse
Affiliation(s)
- Nam V. Hoang
- School of Biological Sciences, Seoul National University, Seoul, South Korea
| | - Chulmin Park
- School of Biological Sciences, Seoul National University, Seoul, South Korea
| | - Muhammad Kamran
- School of Biological Sciences, Seoul National University, Seoul, South Korea
| | - Ji-Young Lee
- School of Biological Sciences, Seoul National University, Seoul, South Korea
- Plant Genomics and Breeding Institute, Seoul National University, Seoul, South Korea
| |
Collapse
|
4
|
Shi Y, Yue X, An L. Integrated regulation triggered by a cryophyte ω-3 desaturase gene confers multiple-stress tolerance in tobacco. J Exp Bot 2018; 69:2131-2148. [PMID: 29432580 PMCID: PMC6019038 DOI: 10.1093/jxb/ery050] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Accepted: 02/02/2018] [Indexed: 05/16/2023]
Abstract
ω-3 fatty acid desaturases (FADs) are thought to contribute to plant stress tolerance mainly through linolenic acid (C18:3)-induced membrane stabilization, but a comprehensive analysis of their roles in stress adaptation is lacking. Here, we isolated a microsomal ω-3 FAD gene (CbFAD3) from a cryophyte (Chorispora bungeana) and elucidated its functions in stress tolerance. CbFAD3, exhibiting a high identity to Arabidopsis AtFAD3, was up-regulated by abiotic stresses. Its functionality was verified by heterogonous expression in yeast. Overexpression of CbFAD3 in tobacco constitutively increased C18:3 in both leaves and roots, which maintained the membrane fluidity, and enhanced plant tolerance to cold, drought, and salt stresses. Notably, the constitutively increased C18:3 induced a sustained activation of plasma membrane Ca2+-ATPase, thereby, changing the stress-induced Ca2+ signaling. The reactive oxygen species (ROS) scavenging system, which was positively correlated with the level of C18:3, was also activated in the transgenic lines. Microarray analysis showed that CbFAD3-overexpressing plants increased the expression of stress-responsive genes, most of which are affected by C18:3, Ca2+, or ROS. Together, CbFAD3 confers tolerance to multiple stresses in tobacco through the C18:3-induced integrated regulation of membrane, Ca2+, ROS, and stress-responsive genes. This is in contrast with previous observations that simply attribute stress tolerance to membrane stabilization.
Collapse
Affiliation(s)
- Yulan Shi
- Extreme Stress Resistance and Biotechnology Laboratory, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, PR China
| | - Xiule Yue
- School of Life Sciences, Lanzhou University, Lanzhou, PR China
| | - Lizhe An
- Extreme Stress Resistance and Biotechnology Laboratory, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, PR China
- School of Life Sciences, Lanzhou University, Lanzhou, PR China
| |
Collapse
|
5
|
Tangsombatvichit P, Semkiv MV, Sibirny AA, Jensen LT, Ratanakhanokchai K, Soontorngun N. Zinc cluster protein Znf1, a novel transcription factor of non-fermentative metabolism in Saccharomyces cerevisiae. FEMS Yeast Res 2015; 15:fou002. [PMID: 25673751 DOI: 10.1093/femsyr/fou002] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The ability to rapidly respond to nutrient changes is a fundamental requirement for cell survival. Here, we show that the zinc cluster regulator Znf1 responds to altered nutrient signals following glucose starvation through the direct control of genes involved in non-fermentative metabolism, including those belonged to the central pathways of gluconeogenesis (PCK1, FBP1 and MDH2), glyoxylate shunt (MLS1 and ICL1) and the tricarboxylic acid cycle (ACO1), which is demonstrated by Znf1-binding enrichment at these promoters during the glucose-ethanol shift. Additionally, reduced Pck1 and Fbp1 enzymatic activities correlate well with the data obtained from gene transcription analysis. Cells deleted for ZNF1 also display defective mitochondrial morphology with unclear structures of the inner membrane cristae when grown in ethanol, in agreement with the substantial reduction in the ATP content, suggesting for roles of Znf1 in maintaining mitochondrial morphology and function. Furthermore, Znf1 also plays a role in tolerance to pH and osmotic stress, especially during the oxidative metabolism. Taken together, our results clearly suggest that Znf1 is a critical transcriptional regulator for stress adaptation during non-fermentative growth with some partial overlapping targets with previously reported regulators in Saccharomyces cerevisiae.
Collapse
Affiliation(s)
- Pitchya Tangsombatvichit
- Division of Biochemical Technology, School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkok 10150, Thailand
| | - Marta V Semkiv
- Institute of Cell Biology, NAS of Ukraine, Lviv 79005, Ukraine
| | - Andriy A Sibirny
- Institute of Cell Biology, NAS of Ukraine, Lviv 79005, Ukraine Department of Biotechnology and Microbiology, University of Rzeszow, Rzeszow 35-601, Poland
| | - Laran T Jensen
- Department of Biochemistry, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
| | - Khanok Ratanakhanokchai
- Division of Biochemical Technology, School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkok 10150, Thailand
| | - Nitnipa Soontorngun
- Division of Biochemical Technology, School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkok 10150, Thailand
| |
Collapse
|
6
|
Huang XS, Luo T, Fu XZ, Fan QJ, Liu JH. Cloning and molecular characterization of a mitogen-activated protein kinase gene from Poncirus trifoliata whose ectopic expression confers dehydration/drought tolerance in transgenic tobacco. J Exp Bot 2011; 62:5191-206. [PMID: 21778184 PMCID: PMC3193021 DOI: 10.1093/jxb/err229] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Revised: 06/27/2011] [Accepted: 06/28/2011] [Indexed: 05/18/2023]
Abstract
The mitogen-activated protein kinase (MAPK) cascade plays pivotal roles in diverse signalling pathways related to plant development and stress responses. In this study, the cloning and functional characterization of a group-I MAPK gene, PtrMAPK, in Poncirus trifoliata (L.) Raf are reported. PtrMAPK contains 11 highly conserved kinase domains and a phosphorylation motif (TEY), and is localized in the nucleus of transformed onion epidermal cells. The PtrMAPK transcript level was increased by dehydration and cold, but was unaffected by salt. Transgenic overexpression of PtrMAPK in tobacco confers dehydration and drought tolerance. The transgenic plants exhibited better water status, less reactive oxygen species (ROS) generation, and higher levels of antioxidant enzyme activity and metabolites than the wild type. Interestingly, the stress tolerance capacity of the transgenic plants was compromised by inhibitors of antioxidant enzymes. In addition, overexpression of PtrMAPK enhanced the expression of ROS-related and stress-responsive genes under normal or drought conditions. Taken together, these data demonstrate that PtrMAPK acts as a positive regulator in dehydration/drought stress responses by either regulating ROS homeostasis through activation of the cellular antioxidant systems or modulating transcriptional levels of a variety of stress-associated genes.
Collapse
Affiliation(s)
- Xiao-San Huang
- Key Laboratory of Horticultural Plant Biology of the Ministry of Education, National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China
| | - Tao Luo
- College of Life Sciences, Huazhong Agricultural University, Wuhan 430070, China
| | - Xing-Zheng Fu
- Key Laboratory of Horticultural Plant Biology of the Ministry of Education, National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China
| | - Qi-Jun Fan
- Key Laboratory of Horticultural Plant Biology of the Ministry of Education, National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China
| | - Ji-Hong Liu
- Key Laboratory of Horticultural Plant Biology of the Ministry of Education, National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China
| |
Collapse
|