1
|
Wang D, Zeng Y, Yang X, Nie S. Characterization of DREB family genes in Lotus japonicus and LjDREB2B overexpression increased drought tolerance in transgenic Arabidopsis. BMC PLANT BIOLOGY 2024; 24:497. [PMID: 39075356 PMCID: PMC11285619 DOI: 10.1186/s12870-024-05225-y] [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: 12/31/2023] [Accepted: 05/30/2024] [Indexed: 07/31/2024]
Abstract
BACKGROUND Drought stress affects plant growth and development. DREB proteins play important roles in modulating plant growth, development, and stress responses, particularly under drought stress. To study the function of DREB transcription factors (TFs), we screened key DREB-regulating TFs for drought in Lotus japonicus. RESULTS Forty-two DREB TFs were identified, and phylogenetic analysis of proteins from L. japonicus classified them into five subfamilies (A1, A2, A4, A5, A6). The gene motif composition of the proteins is conserved within the same subfamily. Based on the cis-acting regulatory element analysis, we identified many growth-, hormone-, and stress-responsive elements within the promoter regions of DREB. We further analyzed the expression pattern of four genes in the A2 subfamily in response to drought stress. We found that the expression of most of the LjDREB A2 subfamily genes, especially LjDREB2B, was induced by drought stress. We further generated LjDREB2B overexpression transgenic Arabidopsis plants. Under drought stress, the growth of wild-type (WT) and overexpressing LjDREB2B (OE) Arabidopsis lines was inhibited; however, OE plants showed better growth. The malondialdehyde content of LjDREB2B overexpressing lines was lower than that of the WT plants, whereas the proline content and antioxidant enzyme activities in the OE lines were significantly higher than those in the WT plants. Furthermore, after drought stress, the expression levels of AtP5CS1, AtP5CS2, AtRD29A, and AtRD29B in the OE lines were significantly higher than those in the WT plants. CONCLUSIONS Our results facilitate further functional analysis of L. japonicus DREB. LjDREB2B overexpression improves drought tolerance in transgenic Arabidopsis. These results indicate that DREB holds great potential for the genetic improvement of drought tolerance in L. japonicus.
Collapse
Affiliation(s)
- Dan Wang
- Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), College of Life Science, China West Normal University, Nanchong, 637009, China
| | - Yuanyuan Zeng
- Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), College of Life Science, China West Normal University, Nanchong, 637009, China
| | - Xiuxiu Yang
- Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), College of Life Science, China West Normal University, Nanchong, 637009, China
| | - Shuming Nie
- Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), College of Life Science, China West Normal University, Nanchong, 637009, China.
| |
Collapse
|
2
|
Mao K, Yang J, Sun Y, Guo X, Qiu L, Mei Q, Li N, Ma F. MdbHLH160 is stabilized via reduced MdBT2-mediated degradation to promote MdSOD1 and MdDREB2A-like expression for apple drought tolerance. PLANT PHYSIOLOGY 2024; 194:1181-1203. [PMID: 37930306 DOI: 10.1093/plphys/kiad579] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 09/26/2023] [Accepted: 09/27/2023] [Indexed: 11/07/2023]
Abstract
Drought stress is a key environmental factor limiting the productivity, quality, and geographic distribution of crops worldwide. Abscisic acid (ABA) plays an important role in plant drought stress responses, but the molecular mechanisms remain unclear. Here, we report an ABA-responsive bHLH transcription factor, MdbHLH160, which promotes drought tolerance in Arabidopsis (Arabidopsis thaliana) and apple (Malus domestica). Under drought conditions, MdbHLH160 is directly bound to the MdSOD1 (superoxide dismutase 1) promoter and activated its transcription, thereby triggering reactive oxygen species (ROS) scavenging and enhancing apple drought tolerance. MdbHLH160 also promoted MdSOD1 enzyme activity and accumulation in the nucleus through direct protein interactions, thus inhibiting excessive nuclear ROS levels. Moreover, MdbHLH160 directly upregulated the expression of MdDREB2A-like, a DREB (dehydration-responsive element binding factor) family gene that promotes apple drought tolerance. Protein degradation and ubiquitination assays showed that drought and ABA treatment stabilized MdbHLH160. The BTB protein MdBT2 was identified as an MdbHLH160-interacting protein that promoted MdbHLH160 ubiquitination and degradation, and ABA treatment substantially inhibited this process. Overall, our findings provide insights into the molecular mechanisms of ABA-modulated drought tolerance at both the transcriptional and post-translational levels via the ABA-MdBT2-MdbHLH160-MdSOD1/MdDREB2A-like cascade.
Collapse
Affiliation(s)
- Ke Mao
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A & F University, Yangling 712100, Shaanxi, China
| | - Jie Yang
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A & F University, Yangling 712100, Shaanxi, China
| | - Yunxia Sun
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A & F University, Yangling 712100, Shaanxi, China
| | - Xin Guo
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A & F University, Yangling 712100, Shaanxi, China
| | - Lina Qiu
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A & F University, Yangling 712100, Shaanxi, China
| | - Quanlin Mei
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A & F University, Yangling 712100, Shaanxi, China
| | - Na Li
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A & F University, Yangling 712100, Shaanxi, China
| | - Fengwang Ma
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A & F University, Yangling 712100, Shaanxi, China
| |
Collapse
|
3
|
Li X, Ma Z, Song Y, Shen W, Yue Q, Khan A, Tahir MM, Wang X, Malnoy M, Ma F, Bus V, Zhou S, Guan Q. Insights into the molecular mechanisms underlying responses of apple trees to abiotic stresses. HORTICULTURE RESEARCH 2023; 10:uhad144. [PMID: 37575656 PMCID: PMC10421731 DOI: 10.1093/hr/uhad144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 07/13/2023] [Indexed: 08/15/2023]
Abstract
Apple (Malus[Formula: see text]domestica) is a popular temperate fruit crop worldwide. However, its growth, productivity, and quality are often adversely affected by abiotic stresses such as drought, extreme temperature, and high salinity. Due to the long juvenile phase and highly heterozygous genome, the conventional breeding approaches for stress-tolerant cultivars are time-consuming and resource-intensive. These issues may be resolved by feasible molecular breeding techniques for apples, such as gene editing and marker-assisted selection. Therefore, it is necessary to acquire a more comprehensive comprehension of the molecular mechanisms underpinning apples' response to abiotic stress. In this review, we summarize the latest research progress in the molecular response of apples to abiotic stressors, including the gene expression regulation, protein modifications, and epigenetic modifications. We also provide updates on new approaches for improving apple abiotic stress tolerance, while discussing current challenges and future perspectives for apple molecular breeding.
Collapse
Affiliation(s)
- Xuewei Li
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Ziqing Ma
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yi Song
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Wenyun Shen
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Qianyu Yue
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Abid Khan
- Department of Horticulture, The University of Haripur, Haripur 22620, Pakistan
| | - Muhammad Mobeen Tahir
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Xiaofei Wang
- State Key Laboratory of Crop Biology, Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai-An, Shandong 271000, China
| | - Mickael Malnoy
- Research and Innovation Centre, Fondazione Edmund Mach, San Michele all’Adige 38098, Italy
| | - Fengwang Ma
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Vincent Bus
- The New Zealand Institute for Plant and Food Research Limited, Havelock North 4157, New Zealand
| | - Shuangxi Zhou
- Department of Biological Sciences, Macquarie University, North Ryde, NSW 2109, Australia
| | - Qingmei Guan
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| |
Collapse
|
4
|
Overexpression of TgERF1, a Transcription Factor from Tectona grandis, Increases Tolerance to Drought and Salt Stress in Tobacco. Int J Mol Sci 2023; 24:ijms24044149. [PMID: 36835560 PMCID: PMC9961280 DOI: 10.3390/ijms24044149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 02/13/2023] [Accepted: 02/16/2023] [Indexed: 02/22/2023] Open
Abstract
Teak (Tectona grandis) is one of the most important wood sources, and it is cultivated in tropical regions with a significant market around the world. Abiotic stresses are an increasingly common and worrying environmental phenomenon because it causes production losses in both agriculture and forestry. Plants adapt to these stress conditions by activation or repression of specific genes, and they synthesize numerous stress proteins to maintain their cellular function. For example, APETALA2/ethylene response factor (AP2/ERF) was found to be involved in stress signal transduction. A search in the teak transcriptome database identified an AP2/ERF gene named TgERF1 with a key AP2/ERF domain. We then verified that the TgERF1 expression is rapidly induced by Polyethylene Glycol (PEG), NaCl, and exogenous phytohormone treatments, suggesting a potential role in drought and salt stress tolerance in teak. The full-length coding sequence of TgERF1 gene was isolated from teak young stems, characterized, cloned, and constitutively overexpressed in tobacco plants. In transgenic tobacco plants, the overexpressed TgERF1 protein was localized exclusively in the cell nucleus, as expected for a transcription factor. Furthermore, functional characterization of TgERF1 provided evidence that TgERF1 is a promising candidate gene to be used as selective marker on plant breeding intending to improve plant stress tolerance.
Collapse
|
5
|
Hoffman NE. USDA's revised biotechnology regulation's contribution to increasing agricultural sustainability and responding to climate change. FRONTIERS IN PLANT SCIENCE 2022; 13:1055529. [PMID: 36507369 PMCID: PMC9726801 DOI: 10.3389/fpls.2022.1055529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 10/28/2022] [Indexed: 06/17/2023]
Abstract
Biotechnology can provide a valuable tool to meet UN Sustainable Development Goals and U.S. initiatives to find climate solutions and improve agricultural sustainability. The literature contains hundreds of examples of crops that may serve this purpose, yet most remain un-launched due to high regulatory barriers. Recently the USDA revised its biotechnology regulations to make them more risk-proportionate, science-based, and streamlined. Here, we review some of the promising leads that may enable agriculture to contribute to UN sustainability goals. We further describe and discuss how the revised biotechnology regulation would hypothetically apply to these cases.
Collapse
|
6
|
Shen L, Zhao E, Liu R, Yang X. Transcriptome Analysis of Eggplant under Salt Stress: AP2/ERF Transcription Factor SmERF1 Acts as a Positive Regulator of Salt Stress. PLANTS (BASEL, SWITZERLAND) 2022; 11:2205. [PMID: 36079586 PMCID: PMC9460861 DOI: 10.3390/plants11172205] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 08/19/2022] [Accepted: 08/23/2022] [Indexed: 06/15/2023]
Abstract
Salt stress, a type of abiotic stress, impedes plant growth and development and strongly reduces crop yield. The molecular mechanisms underlying plant responses to salt stress remain largely unclear. To characterize the enriched pathways and genes that were affected during salt treatment, we performed mRNA sequencing (mRNA-seq) in eggplant roots and identified 8509 differentially expressed genes (DEGs) between the mock and 24 h under salt stress. Among these DEGs, we found that the AP2/ERF transcription factor family member SmERF1 belongs to the plant-pathogen interaction pathway, which was significantly upregulated by salt stress. We found that SmERF1 localizes in the nuclei with transcriptional activity. The results of the virus-induced gene silencing assay showed that SmERF1 silencing markedly enhanced the susceptibility of plants to salt stress, significantly downregulated the transcript expression levels of salt stress defense-related marker genes (9-cis-epoxycarotenoid dioxygenase [SmNCED1, SmNCED2], Dehydrin [SmDHN1], and Dehydrin (SmDHNX1), and reduced the activity of superoxide dismutase and catalase. Silencing SmERF1 promoted the generation of H2O2 and proline. In addition, the transient overexpression of SmERF1 triggered intense cell death in eggplant leaves, as assessed by the darker diaminobenzidine and trypan blue staining. These findings suggest that SmERF1 acts as a positive regulator of eggplant response to salt stress. Hence, our results suggest that AP2/ERF transcription factors play a vital role in the response to salt stress.
Collapse
Affiliation(s)
- Lei Shen
- College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China
| | - Enpeng Zhao
- College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China
| | - Ruie Liu
- Shanghai Center for Plant Stress Biology, National Key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 201600, China
| | - Xu Yang
- College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China
| |
Collapse
|
7
|
Sugarcane ScDREB2B-1 Confers Drought Stress Tolerance in Transgenic Nicotiana benthamiana by Regulating the ABA Signal, ROS Level and Stress-Related Gene Expression. Int J Mol Sci 2022; 23:ijms23179557. [PMID: 36076957 PMCID: PMC9455921 DOI: 10.3390/ijms23179557] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 08/16/2022] [Accepted: 08/20/2022] [Indexed: 11/16/2022] Open
Abstract
The dehydration-responsive element-binding protein (DREB) is a subgroup member of the AP2/ERF family and actively participates in the response of plants to abiotic stress. Although DREB genes have been studied in a variety of plant species, there are few reports of DREB genes in sugarcane (Saccharum spp.). In this study, a novel full-length cDNA sequence of the ScDREB2B-1 gene was cloned from the Saccharum hybrid ROC22, whose encoding protein contained only one AP2-conserved domain and was clustered into the DREB (A-2) subgroup. The diverse promoter elements in the ScDREB2B-1 gene and the accumulated transcripts of its homologous gene (SsAP2/ERF-107) in S. spontaneum under drought stress suggest that the ScDREB2B-1 gene may play a role in drought response. In addition, reverse transcription quantitative PCR analysis showed that the expression level of the ScDREB2B-1 gene was upregulated in the root and leaf of ROC22 under polyethylene glycol, sodium chloride and abscisic acid (ABA) treatments. The yeast two-hybrid experiment demonstrated that ScDREB2B-1 had transcriptional self-activation activity. Compared with wild-type plants, the overexpression of the ScDREB2B-1 gene improved the drought tolerance of the transgenic Nicotiana benthamiana by activating the ABA pathway to enhance the expression of the ABA-responsive gene (NbNCED) and ABA content, regulate the intracellular reactive oxygen species (ROS) level (enhance the transcripts of ROS synthase-related gene NbRbohB and the activities of catalase, peroxidase and superoxide dismutase) and increase the relative water content, proline content and expression level of osmotic stress-related genes (NbERD and NbLEA). Collectively, our data indicate that ScDREB2B-1 is a stress-inducible and ABA-responsive transcription factor gene that responds to drought stress by regulating ABA signaling, ROS levels and stress-related gene expression. This study contributes to a better understanding of the biological function of ScDREB2B-1, which could serve as a foundation for future resistance breeding in sugarcane.
Collapse
|
8
|
Lu G, Wang L, Zhou L, Su X, Guo H, Cheng H. Overexpression of AmCBF1 enhances drought and cold stress tolerance, and improves photosynthesis in transgenic cotton. PeerJ 2022; 10:e13422. [PMID: 35637712 PMCID: PMC9147321 DOI: 10.7717/peerj.13422] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 04/20/2022] [Indexed: 01/14/2023] Open
Abstract
China's main cotton production area is located in the northwest where abiotic stresses, particularly cold and drought, have serious effects on cotton production. In this study, Ammopiptanthus mongolicus C-repeat-binding factor (AmCBF1) isolated from the shrub Ammopiptanthus mongolicus was inserted into upland cotton (Gossypium hirsutum L.) cultivar R15 to evaluate the potential benefits of this gene. Two transgenic lines were selected, and the transgene insertion site was identified using whole-genome sequencing. The results showed that AmCBF1 was incorporated into the cotton genome as a single copy. Transgenic plants had distinctly higher relative water content (RWC), chlorophyll content, soluble sugar content, and lower ion leakage than R15 after drought and cold stress. Some characteristics, such as the area of lower epidermal cells, stomatal density, and root to shoot ratio, varied significantly between transgenic cotton lines and R15. Although the photosynthetic ability of transgenic plants was inhibited after stress, the net photosynthetic rate, stomatal conductance, and transpiration rate in transgenic plants were significantly higher than in R15. This suggested that an enhanced stress tolerance and photosynthesis of transgenic cotton was achieved by overexpressing AmCBF1. All together, our results demonstrate that the new transgenic cotton germplasm has great application value against abiotic stresses, especially in the northwest inland area of China.
Collapse
Affiliation(s)
- Guoqing Lu
- Chinese Academy of Agricultural Sciences, Biotechnology Research Institute, Beijing, China,Tianjin Academy of Agricultural Sciences, Institute of Germplasm Resources and Biotechnology, Tianjin, China
| | - Lihua Wang
- Chinese Academy of Agricultural Sciences, Biotechnology Research Institute, Beijing, China
| | - Lili Zhou
- Chinese Academy of Agricultural Sciences, Biotechnology Research Institute, Beijing, China
| | - Xiaofeng Su
- Chinese Academy of Agricultural Sciences, Biotechnology Research Institute, Beijing, China
| | - Huiming Guo
- Chinese Academy of Agricultural Sciences, Biotechnology Research Institute, Beijing, China
| | - Hongmei Cheng
- Chinese Academy of Agricultural Sciences, Biotechnology Research Institute, Beijing, China
| |
Collapse
|
9
|
Ranjan A, Sinha R, Singla-Pareek SL, Pareek A, Singh AK. Shaping the root system architecture in plants for adaptation to drought stress. PHYSIOLOGIA PLANTARUM 2022; 174:e13651. [PMID: 35174506 DOI: 10.1111/ppl.13651] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 02/05/2022] [Accepted: 02/11/2022] [Indexed: 06/14/2023]
Abstract
Root system architecture plays an important role in plant adaptation to drought stress. The root system architecture (RSA) consists of several structural features, which includes number and length of main and lateral roots along with the density and length of root hairs. These features exhibit plasticity under water-limited environments and could be critical to developing crops with efficient root systems for adaptation under drought. Recent advances in the omics approaches have significantly improved our understanding of the regulatory mechanisms of RSA remodeling under drought and the identification of genes and other regulatory elements. Plant response to drought stress at physiological, morphological, biochemical, and molecular levels in root cells is regulated by various phytohormones and their crosstalk. Stress-induced reactive oxygen species play a significant role in regulating root growth and development under drought stress. Several transcription factors responsible for the regulation of RSA under drought have proven to be beneficial for developing drought tolerant crops. Molecular breeding programs for developing drought-tolerant crops have been greatly benefitted by the availability of quantitative trait loci (QTLs) associated with the RSA regulation. In the present review, we have discussed the role of various QTLs, signaling components, transcription factors, microRNAs and crosstalk among various phytohormones in shaping RSA and present future research directions to better understand various factors involved in RSA remodeling for adaptation to drought stress. We believe that the information provided herein may be helpful in devising strategies to develop crops with better RSA for efficient uptake and utilization of water and nutrients under drought conditions.
Collapse
Affiliation(s)
- Alok Ranjan
- School of Genetic Engineering, ICAR-Indian Institute of Agricultural Biotechnology, Ranchi, India
| | - Ragini Sinha
- School of Genetic Engineering, ICAR-Indian Institute of Agricultural Biotechnology, Ranchi, India
| | - Sneh L Singla-Pareek
- Plant Stress Biology Group, International Centre for Genetic Engineering and Biotechnology, New Delhi, India
| | - Ashwani Pareek
- Stress Physiology and Molecular Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi, India
- National Agri-Food Biotechnology Institute, Mohali, Punjab, India
| | - Anil Kumar Singh
- School of Genetic Engineering, ICAR-Indian Institute of Agricultural Biotechnology, Ranchi, India
- ICAR-National Institute for Plant Biotechnology, LBS Centre, New Delhi, India
| |
Collapse
|
10
|
Ma C, Bian C, Liu W, Sun Z, Xi X, Guo D, Liu X, Tian Y, Wang C, Zheng X. Strigolactone alleviates the salinity-alkalinity stress of Malus hupehensis seedlings. FRONTIERS IN PLANT SCIENCE 2022; 13:901782. [PMID: 35937337 PMCID: PMC9354494 DOI: 10.3389/fpls.2022.901782] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Accepted: 07/04/2022] [Indexed: 05/22/2023]
Abstract
Salinity-alkalinity stress can remarkably affect the growth and yield of apple. Strigolactone (SL) is a class of carotenoid-derived compounds that functions in stress tolerance. However, the effects and mechanism of exogenous SL on the salinity-alkalinity tolerance of apple seedlings remain unclear. Here, we assessed the effect of SL on the salinity-alkalinity stress response of Malus hupehensis seedlings. Results showed that treatment with 100 μM exogenous SL analog (GR24) could effectively alleviate salinity-alkalinity stress with higher chlorophyll content and photosynthetic rate than the apple seedlings without GR24 treatment. The mechanism was also explored: First, exogenous GR24 regulated the expression of Na+/K+ transporter genes and decreased the ratio of Na+/K+ in the cytoplasm to maintain ion homeostasis. Second, exogenous GR24 increased the enzyme activities of superoxide, peroxidase and catalase, thereby eliminating reactive oxygen species production. Third, exogenous GR24 alleviated the high pH stress by regulating the expression of H+-ATPase genes and inducing the production of organic acid. Last, exogenous GR24 application increased endogenous acetic acid, abscisic acid, zeatin riboside, and GA3 contents for co-responding to salinity-alkalinity stress indirectly. This study will provide important theoretical basis for analyzing the mechanism of exogenous GR24 in improving salinity-alkalinity tolerance of apple.
Collapse
Affiliation(s)
- Changqing Ma
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Qingdao, China
| | - Chuanjie Bian
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Qingdao, China
| | - Wenjie Liu
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Qingdao, China
| | - Zhijuan Sun
- College of Life Science, Qingdao Agricultural University, Qingdao, China
| | - Xiangli Xi
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Qingdao, China
| | - Dianming Guo
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Qingdao, China
| | - Xiaoli Liu
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Qingdao, China
| | - Yike Tian
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Qingdao, China
| | - Caihong Wang
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Qingdao, China
| | - Xiaodong Zheng
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Qingdao, China
- *Correspondence: Xiaodong Zheng,
| |
Collapse
|
11
|
Hezema YS, Shukla MR, Goel A, Ayyanath MM, Sherif SM, Saxena PK. Rootstocks Overexpressing StNPR1 and StDREB1 Improve Osmotic Stress Tolerance of Wild-Type Scion in Transgrafted Tobacco Plants. Int J Mol Sci 2021; 22:8398. [PMID: 34445105 PMCID: PMC8395105 DOI: 10.3390/ijms22168398] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 07/30/2021] [Accepted: 08/03/2021] [Indexed: 12/24/2022] Open
Abstract
In grafted plants, the movement of long-distance signals from rootstocks can modulate the development and function of the scion. To understand the mechanisms by which tolerant rootstocks improve scion responses to osmotic stress (OS) conditions, mRNA transport of osmotic responsive genes (ORGs) was evaluated in a tomato/potato heterograft system. In this system, Solanum tuberosum was used as a rootstock and Solanum lycopersicum as a scion. We detected changes in the gene expression levels of 13 out of the 21 ORGs tested in the osmotically stressed plants; of these, only NPR1 transcripts were transported across the graft union under both normal and OS conditions. Importantly, OS increased the abundance of StNPR1 transcripts in the tomato scion. To examine mRNA mobility in transgrafted plants, StNPR1 and StDREB1 genes representing the mobile and non-mobile transcripts, respectively, were overexpressed in tobacco (Nicotiana tabacum). The evaluation of transgenic tobacco plants indicated that overexpression of these genes enhanced the growth and improved the physiological status of transgenic plants growing under OS conditions induced by NaCl, mannitol and polyethylene glycol (PEG). We also found that transgenic tobacco rootstocks increased the OS tolerance of the WT-scion. Indeed, WT scions on transgenic rootstocks had higher ORGs transcript levels than their counterparts on non-transgenic rootstocks. However, neither StNPR1 nor StDREB1 transcripts were transported from the transgenic rootstock to the wild-type (WT) tobacco scion, suggesting that other long-distance signals downstream these transgenes could have moved across the graft union leading to OS tolerance. Overall, our results signify the importance of StNPR1 and StDREB1 as two anticipated candidates for the development of stress-resilient crops through transgrafting technology.
Collapse
Affiliation(s)
- Yasmine S. Hezema
- Gosling Research Institute for Plant Preservation, Department of Plant Agriculture, University of Guelph, Guelph, ON N1G 2W1, Canada; (Y.S.H.); (M.R.S.); (A.G.); (M.M.A.)
- Department of Horticulture, Damanhour University, Damanhour 22713, El-Beheira, Egypt
| | - Mukund R. Shukla
- Gosling Research Institute for Plant Preservation, Department of Plant Agriculture, University of Guelph, Guelph, ON N1G 2W1, Canada; (Y.S.H.); (M.R.S.); (A.G.); (M.M.A.)
| | - Alok Goel
- Gosling Research Institute for Plant Preservation, Department of Plant Agriculture, University of Guelph, Guelph, ON N1G 2W1, Canada; (Y.S.H.); (M.R.S.); (A.G.); (M.M.A.)
| | - Murali M. Ayyanath
- Gosling Research Institute for Plant Preservation, Department of Plant Agriculture, University of Guelph, Guelph, ON N1G 2W1, Canada; (Y.S.H.); (M.R.S.); (A.G.); (M.M.A.)
| | - Sherif M. Sherif
- Alson H. Smith Jr. Agricultural Research and Extension Center, School of Plant and Environmental Sciences, Virginia Tech, Winchester, VA 22602, USA
| | - Praveen K. Saxena
- Gosling Research Institute for Plant Preservation, Department of Plant Agriculture, University of Guelph, Guelph, ON N1G 2W1, Canada; (Y.S.H.); (M.R.S.); (A.G.); (M.M.A.)
| |
Collapse
|
12
|
Li Y, Zheng X, Tian Y, Ma C, Yang S, Wang C. Comparative transcriptome analysis of NaCl and KCl stress response in Malus hupehensis Rehd. Provide insight into the regulation involved in Na + and K + homeostasis. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2021; 164:101-114. [PMID: 33975146 DOI: 10.1016/j.plaphy.2021.04.022] [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] [Received: 12/24/2020] [Accepted: 04/21/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Apple is among the most widely cultivated perennial fruit crops worldwide. It is sensitive to salt stress, which seriously affects the growth and productivity of apple trees by destroying the homeostasis of Na+ and K+. Previous studies focused on the molecular mechanism underlying NaCl stress. However, signaling transduction under KCl stress has not been thoroughly studied. RESULTS We comprehensively analyzed the salt tolerance of Malus hupehensis Rehd., which is a widely used rootstock in apple orchards, by using RNA-Seq. Roots and leaves were treated with NaCl and KCl. Based on mapping analyses, a total of 762 differentially expressed genes (DEGs) related to NaCl and KCl stress in the roots and leaves were identified. Furthermore, we identified seven hub genes by WGCNA Analysis. The Gene Ontology (GO) terms were enriched in ion transmembrane transporter and oxidoreductase activity under NaCl and KCl stress. The Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways focused on the plant hormone signal transduction and mitogen-activated protein kinase signaling pathway. We also screened out 28 candidate genes from 762 DEGs and verified their expression by quantitative reverse transcription polymerase chain reaction (qRT-PCR). All of these enriched genes were closely related to NaCl and KCl stress and take part in mediating the Na+ and K+ homeostasis in M. hupehensis. CONCLUSIONS This transcriptome analysis provides a valuable resource for elucidating the signaling pathway of NaCl and KCl stress and is a substantial genetic resource for discovering genes related to the NaCl and KCl stress response.
Collapse
Affiliation(s)
- Yuqi Li
- College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China; Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticulture Plants, Qingdao, 266109, China
| | - Xiaodong Zheng
- College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China; Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticulture Plants, Qingdao, 266109, China
| | - Yike Tian
- College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China; Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticulture Plants, Qingdao, 266109, China
| | - Changqing Ma
- College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China; Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticulture Plants, Qingdao, 266109, China
| | - Shaolan Yang
- College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China; Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticulture Plants, Qingdao, 266109, China
| | - Caihong Wang
- College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China; Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticulture Plants, Qingdao, 266109, China.
| |
Collapse
|
13
|
Shahzad R, Jamil S, Ahmad S, Nisar A, Amina Z, Saleem S, Zaffar Iqbal M, Muhammad Atif R, Wang X. Harnessing the potential of plant transcription factors in developing climate resilient crops to improve global food security: Current and future perspectives. Saudi J Biol Sci 2021; 28:2323-2341. [PMID: 33911947 PMCID: PMC8071895 DOI: 10.1016/j.sjbs.2021.01.028] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 12/09/2020] [Accepted: 01/12/2021] [Indexed: 12/20/2022] Open
Abstract
Crop plants should be resilient to climatic factors in order to feed ever-increasing populations. Plants have developed stress-responsive mechanisms by changing their metabolic pathways and switching the stress-responsive genes. The discovery of plant transcriptional factors (TFs), as key regulators of different biotic and abiotic stresses, has opened up new horizons for plant scientists. TFs perceive the signal and switch certain stress-responsive genes on and off by binding to different cis-regulatory elements. More than 50 families of plant TFs have been reported in nature. Among them, DREB, bZIP, MYB, NAC, Zinc-finger, HSF, Dof, WRKY, and NF-Y are important with respect to biotic and abiotic stresses, but the potential of many TFs in the improvement of crops is untapped. In this review, we summarize the role of different stress-responsive TFs with respect to biotic and abiotic stresses. Further, challenges and future opportunities linked with TFs for developing climate-resilient crops are also elaborated.
Collapse
Affiliation(s)
- Rahil Shahzad
- Agricultural Biotechnology Research Institute, Ayub Agricultural Research Institute, Faisalabad 38000, Pakistan
| | - Shakra Jamil
- Agricultural Biotechnology Research Institute, Ayub Agricultural Research Institute, Faisalabad 38000, Pakistan
| | - Shakeel Ahmad
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China
| | - Amina Nisar
- Department of Plant Breeding and Genetics, University of Agriculture, Faisalabad 38000, Pakistan
| | - Zarmaha Amina
- Department of Plant Breeding and Genetics, University of Agriculture, Faisalabad 38000, Pakistan
| | - Shazmina Saleem
- Department of Plant Breeding and Genetics, University of Agriculture, Faisalabad 38000, Pakistan
| | - Muhammad Zaffar Iqbal
- Agricultural Biotechnology Research Institute, Ayub Agricultural Research Institute, Faisalabad 38000, Pakistan
| | - Rana Muhammad Atif
- Department of Plant Breeding and Genetics, University of Agriculture, Faisalabad 38000, Pakistan
- Center for Advanced Studies in Agriculture and Food Security (CAS-AFS), University of Agriculture Faisalabad, University Road, 38040, Faisalabad, Pakistan
| | - Xiukang Wang
- College of Life Sciences, Yan’an University, Yan’an 716000, China
| |
Collapse
|
14
|
Gad M, Chao H, Li H, Zhao W, Lu G, Li M. QTL Mapping for Seed Germination Response to Drought Stress in Brassica napus. FRONTIERS IN PLANT SCIENCE 2021; 11:629970. [PMID: 33633753 PMCID: PMC7900748 DOI: 10.3389/fpls.2020.629970] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 12/22/2020] [Indexed: 05/25/2023]
Abstract
Drought stress is one of the most environmental abiotic stresses affecting seed germination and crop growth. In the present study, the genetic characteristics of seed germination under drought stress in a Brassica napus double haploid population were analyzed. Five germination-related indexes, including germination percentage (GP), root length (RL), shoot length (SL), fresh weight (FW), and root-to-shoot length ratio (R/S) under control and drought stress, were calculated, and the drought stress index (DSI), including DSI-GP, DSI-RL, DSI-SL, DSI-FW, and DSI-R/S, was determined using the quantitative trait loci (QTLs) analysis based on high-density genetic linkage map. The phenotypic analysis indicated that the R/S is an effective morphological trait in the determination of drought tolerance in the seedling stage. Thirty-nine identified QTLs were observed for these traits and then integrated into 36 consensus QTLs, in which 18 QTLs were found to affect the DSI of four traits (GP, RL, SL, and R/S). Based on the co-linearity between genetic and physical maps of B. napus, 256 candidate genes were detected, and 128 genes have single-nucleotidepolymorphisms/insertion-deletion (SNP/InDel) variations between two parents, some of which were associated with the drought stress tolerance (for example, BnaC03g32780D, BnaC03g37030D, and BnaC09g27300D). The present results laid insights into drought tolerance and its genetic bases in B. napus.
Collapse
Affiliation(s)
- Mahmoud Gad
- Department of Biotechnology, Collage of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China
| | - Hongbo Chao
- Department of Biotechnology, Collage of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China
- School of Agricultural Sciences, Zhengzhou University, Zhengzhou, China
| | - Huaixin Li
- Department of Biotechnology, Collage of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China
| | - Weiguo Zhao
- Department of Biotechnology, Collage of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China
| | - Guangyuan Lu
- Faculty of Biology and Food Engineering, Guangdong University of Petrochemical Technology, Maoming, China
| | - Maoteng Li
- Department of Biotechnology, Collage of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China
| |
Collapse
|
15
|
Ji ZL, Yu MH, Ding YY, Li J, Zhu F, He JX, Yang LN. Coiled-Coil N21 of Hpa1 in Xanthomonas oryzae pv. oryzae Promotes Plant Growth, Disease Resistance and Drought Tolerance in Non-Hosts via Eliciting HR and Regulation of Multiple Defense Response Genes. Int J Mol Sci 2020; 22:E203. [PMID: 33379173 PMCID: PMC7795061 DOI: 10.3390/ijms22010203] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 12/23/2020] [Accepted: 12/24/2020] [Indexed: 12/18/2022] Open
Abstract
Acting as a typical harpin protein, Hpa1 of Xanthomonas oryzae pv. oryzae is one of the pathogenic factors in hosts and can elicit hypersensitive responses (HR) in non-hosts. To further explain the underlying mechanisms of its induced resistance, we studied the function of the most stable and shortest three heptads in the N-terminal coiled-coil domain of Hpa1, named N21Hpa1. Proteins isolated from N21-transgenic tobacco elicited HR in Xanthi tobacco, which was consistent with the results using N21 and full-length Hpa1 proteins expressed in Escherichia coli. N21-expressing tobacco plants showed enhanced resistance to tobacco mosaic virus (TMV) and Pectobacterium carotovora subsp. carotovora (Pcc). Spraying of a synthesized N21 peptide solution delayed the disease symptoms caused by Botrytis cinerea and Monilinia fructicola and promoted the growth and drought tolerance of plants. Further analysis indicated that N21 upregulated the expression of multiple plant defense-related genes, such as genes mediated by salicylic acid (SA), jasmonic acid (JA) and ethylene (ET) signaling, and genes related to reactive oxygen species (ROS) biosynthesis. Further, the bioavailability of N21 peptide was better than that of full-length Hpa1Xoo. Our studies support the broad application prospects of N21 peptide as a promising succedaneum to biopesticide Messenger or Illite or other biological pharmaceutical products, and provide a basis for further development of biopesticides using proteins with similar structures.
Collapse
Affiliation(s)
- Zhao-Lin Ji
- College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China; (Z.-L.J.); (Y.-Y.D.); (J.L.); (F.Z.)
| | - Mei-Hui Yu
- School of Life Sciences and State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China;
| | - Ya-Yan Ding
- College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China; (Z.-L.J.); (Y.-Y.D.); (J.L.); (F.Z.)
| | - Jian Li
- College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China; (Z.-L.J.); (Y.-Y.D.); (J.L.); (F.Z.)
| | - Feng Zhu
- College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China; (Z.-L.J.); (Y.-Y.D.); (J.L.); (F.Z.)
| | - Jun-Xian He
- School of Life Sciences and State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China;
| | - Li-Na Yang
- College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China; (Z.-L.J.); (Y.-Y.D.); (J.L.); (F.Z.)
| |
Collapse
|
16
|
Almeida-Silva F, Moharana KC, Machado FB, Venancio TM. Exploring the complexity of soybean (Glycine max) transcriptional regulation using global gene co-expression networks. PLANTA 2020; 252:104. [PMID: 33196909 DOI: 10.1007/s00425-020-03499-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 10/15/2020] [Indexed: 06/11/2023]
Abstract
MAIN CONCLUSION We report a soybean gene co-expression network built with data from 1284 RNA-Seq experiments, which was used to identify important regulators, modules and to elucidate the fates of gene duplicates. Soybean (Glycine max (L.) Merr.) is one of the most important crops worldwide, constituting a major source of protein and edible oil. Gene co-expression networks (GCN) have been extensively used to study transcriptional regulation and evolution of genes and genomes. Here, we report a soybean GCN using 1284 publicly available RNA-Seq samples from 15 distinct tissues. We found modules that are differentially regulated in specific tissues, comprising processes such as photosynthesis, gluconeogenesis, lignin metabolism, and response to biotic stress. We identified transcription factors among intramodular hubs, which probably integrate different pathways and shape the transcriptional landscape in different conditions. The top hubs for each module tend to encode proteins with critical roles, such as succinate dehydrogenase and RNA polymerase subunits. Importantly, gene essentiality was strongly correlated with degree centrality and essential hubs were enriched in genes involved in nucleic acids metabolism and regulation of cell replication. Using a guilt-by-association approach, we predicted functions for 93 of 106 hubs without functional description in soybean. Most of the duplicated genes had different transcriptional profiles, supporting their functional divergence, although paralogs originating from whole-genome duplications (WGD) are more often preserved in the same module than those from other mechanisms. Together, our results highlight the importance of GCN analysis in unraveling key functional aspects of the soybean genome, in particular those associated with hub genes and WGD events.
Collapse
Affiliation(s)
- Fabricio Almeida-Silva
- Laboratório de Química e Função de Proteínas e Peptídeos, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego 2000, P5, sala 217, Campos dos Goytacazes, RJ, Brazil
| | - Kanhu C Moharana
- Laboratório de Química e Função de Proteínas e Peptídeos, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego 2000, P5, sala 217, Campos dos Goytacazes, RJ, Brazil
| | - Fabricio B Machado
- Laboratório de Química e Função de Proteínas e Peptídeos, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego 2000, P5, sala 217, Campos dos Goytacazes, RJ, Brazil
| | - Thiago M Venancio
- Laboratório de Química e Função de Proteínas e Peptídeos, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego 2000, P5, sala 217, Campos dos Goytacazes, RJ, Brazil.
| |
Collapse
|
17
|
Lu F, Wang K, Yan L, Peng Y, Qu J, Wu J, Cao Y, Yang Q, Fu F, Yu H. Isolation and characterization of maize ZmPP2C26 gene promoter in drought-response. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2020; 26:2189-2197. [PMID: 33268922 PMCID: PMC7688808 DOI: 10.1007/s12298-020-00910-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 10/20/2020] [Accepted: 11/04/2020] [Indexed: 05/14/2023]
Abstract
The clade A members of serine/threonine protein phosphatase 2Cs (PP2Cs) play crucial roles in plant growth, development, and stress response via the ABA signaling pathway. But little is known about other PP2C clades in plants. Our previous study showed that maize the ZmPP2C26, a clade B member of ZmPP2Cs, negatively regulated drought tolerance in transgenic Arabidopsis. However, the upstream regulatory mechanism of ZmPP2C26 remains unclear. In the present study, the expression of ZmPP2C26 gene in maize was analyzed by quantitative real time PCR (qRT-PCR). The results showed that the expression of ZmPP2C26 in shoot and root was both significantly inhibited by drought stress. Subsequently, a 2175 bp promoter of ZmPP2C26 was isolated from maize genome (P 2175). To validate whether the promoter possess some key cis-element and negatively drive ZmPP2C26 expression in drought stress, three 5´-deletion fragments of 1505, 1084 and 215 bp was amplified from P 2175 and were fused to β-glucuronidase (GUS) and luciferase gene (LUC) to produce promoter::GUS and promoter::LUC constructs, and transformed into tobacco, respectively. Transient expression assays indicated that all promoters could drive GUS and LUC expression. The GUS and LUC activity were both significantly inhibited by PEG-6000 treatment. Notably, the - 1084 to - 215 bp promoter possess one MBS element and inhibits the expression of GUS and LUC under drought stress. Meanwhile, we found that the 215 bp length is enough to drive ZmPP2C26 expression. These findings will provide insights into understanding the transcription-regulatory mechanism of ZmPP2C26 negatively regulating drought tolerance.
Collapse
Affiliation(s)
- Fengzhong Lu
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130 People’s Republic of China
| | - Kexin Wang
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130 People’s Republic of China
| | - Lamei Yan
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130 People’s Republic of China
| | - Yalin Peng
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130 People’s Republic of China
| | - Jingtao Qu
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130 People’s Republic of China
| | - Jing Wu
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130 People’s Republic of China
| | - Yang Cao
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130 People’s Republic of China
| | - Qingqing Yang
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130 People’s Republic of China
| | - Fengling Fu
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130 People’s Republic of China
| | - Haoqiang Yu
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130 People’s Republic of China
| |
Collapse
|
18
|
Sun H, Sun X, Wang H, Ma X. Advances in salt tolerance molecular mechanism in tobacco plants. Hereditas 2020; 157:5. [PMID: 32093781 PMCID: PMC7041081 DOI: 10.1186/s41065-020-00118-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Accepted: 02/18/2020] [Indexed: 02/01/2023] Open
Abstract
Tobacco, an economic crop and important model plant, has received more progress in salt tolerance with the aid of transgenic technique. Salt stress has become a key research field in abiotic stress. The study of tobacco promotes the understanding about the important adjustment for survival in high salinity environments, including cellular ion transport, osmotic regulation, antioxidation, signal transduction and expression regulation, and protection of cells from stress damage. Genes, which response to salt, have been studied using targeted transgenic technologies in tobacco plants to investigate the molecular mechanisms. The transgenic tobacco plants exhibited higher seed germination and survival rates, better root and shoot growth under salt stress treatments. Transgenic approach could be the promising option for enhancing tobacco production under saline condition. This review highlighted the salt tolerance molecular mechanisms of tobacco.
Collapse
Affiliation(s)
- Haiji Sun
- School of Life Science, Shandong Normal University, Jinan, 250014 China
| | - Xiaowen Sun
- School of Life Science, Shandong Normal University, Jinan, 250014 China
| | - Hui Wang
- School of Life Science, Shandong Normal University, Jinan, 250014 China
| | - Xiaoli Ma
- Central laboratory, Jinan Central Hospital Affiliated to Shandong University, Jinan, 250013 China
| |
Collapse
|
19
|
Su Q, Zheng X, Tian Y, Wang C. Exogenous Brassinolide Alleviates Salt Stress in Malus hupehensis Rehd. by Regulating the Transcription of NHX-Type Na +(K +)/H + Antiporters. FRONTIERS IN PLANT SCIENCE 2020; 11:38. [PMID: 32117377 PMCID: PMC7016215 DOI: 10.3389/fpls.2020.00038] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 01/13/2020] [Indexed: 05/19/2023]
Abstract
Brassinolide (BL) mediates various physiological processes and improves plant tolerance to abiotic stresses. However, the effects and mechanism of exogenous BL on the salt tolerance of apple seedlings remain unclear. Herein, we investigated the role of BL in the salt stress response of Malus hupehensis Rehd., a widely grown apple rootstock. Salt-stressed apple seedlings showed significant decline in chlorophyll content and photosynthetic rate, and the application of 0.2 mg/L exogenous BL alleviated salt stress and maintained photosynthetic capacity. Exogenous BL application can strengthen the activities of superoxide dismutase and catalase and thereby eliminates reactive oxygen species (ROS) production induced by salt stress and promote the accumulation of proline and soluble sugar, thus maintaining osmotic balance. Furthermore, exogenous BL application decreased Na+ accumulation and increased K+ content in shoots and roots under salt stress by regulating the expression levels of Na+(K+)/H + antiporter genes (MhNHXs). MhBZR1 and MhBZR2, which are the key transcription factors in the BR signal transduction pathway, can directly bind to the promoter of MhSOS1 and MhNHX4-1, respectively, and inhibit their expression. Our findings would provide a theoretical basis for analyzing the mechanism of exogenous BL application on the salt tolerance of apples.
Collapse
Affiliation(s)
- Qiufang Su
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
- Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticulture Plants, Qingdao Agricultural University, Qingdao, China
| | - Xiaodong Zheng
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
- Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticulture Plants, Qingdao Agricultural University, Qingdao, China
| | - Yike Tian
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
- Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticulture Plants, Qingdao Agricultural University, Qingdao, China
| | - Caihong Wang
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
- Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticulture Plants, Qingdao Agricultural University, Qingdao, China
- *Correspondence: Caihong Wang,
| |
Collapse
|