scholarly journals The WRKY Transcription Factor GmWRKY12 Confers Drought and Salt Tolerance in Soybean

2018 ◽  
Vol 19 (12) ◽  
pp. 4087 ◽  
Author(s):  
Wen-Yan Shi ◽  
Yong-Tao Du ◽  
Jian Ma ◽  
Dong-Hong Min ◽  
Long-Guo Jin ◽  
...  
Keyword(s):  
Abiotic Stress ◽  
Salt Tolerance ◽  
Stress Responses ◽  
Abiotic Stress Tolerance ◽  
Wrky Transcription Factor ◽  
Rna Seq ◽  
Soybean Seedlings ◽  
Drought And Salt Tolerance ◽  
Drought And Salt Stress ◽  
Mda Content

WRKYs are important regulators in plant development and stress responses. However, knowledge of this superfamily in soybean is limited. In this study, we characterized the drought- and salt-induced gene GmWRKY12 based on RNA-Seq and qRT-PCR. GmWRKY12, which is 714 bp in length, encoded 237 amino acids and grouped into WRKY II. The promoter region of GmWRKY12 included ABER4, MYB, MYC, GT-1, W-box and DPBF cis-elements, which possibly participate in abscisic acid (ABA), drought and salt stress responses. GmWRKY12 was minimally expressed in different tissues under normal conditions but highly expressed under drought and salt treatments. As a nucleus protein, GmWRKY12 was responsive to drought, salt, ABA and salicylic acid (SA) stresses. Using a transgenic hairy root assay, we further characterized the roles of GmWRKY12 in abiotic stress tolerance. Compared with control (Williams 82), overexpression of GmWRKY12 enhanced drought and salt tolerance, increased proline (Pro) content and decreased malondialdehyde (MDA) content under drought and salt treatment in transgenic soybean seedlings. These results may provide a basis to understand the functions of GmWRKY12 in abiotic stress responses in soybean.

scholarly journals Heterologous Expression of Dehydration-Inducible MfWRKY17 of Myrothamnus Flabellifolia Confers Drought and Salt Tolerance in Arabidopsis

2020 ◽  
Vol 21 (13) ◽  
pp. 4603
Author(s):  
Zhuo Huang ◽  
Han-Du Guo ◽  
Ling Liu ◽  
Si-Han Jin ◽  
Pei-Lei Zhu ◽  
...  
Keyword(s):  
Abiotic Stress ◽  
Salt Tolerance ◽  
Stress Tolerance ◽  
Stress Responses ◽  
Molecular Mechanisms ◽  
Wrky Transcription Factor ◽  
Resurrection Plant ◽  
Drought And Salt Tolerance ◽  
High Degree

As the only woody resurrection plant, Myrothamnus flabellifolia has a strong tolerance to drought and can survive long-term in a desiccated environment. However, the molecular mechanisms related to the stress tolerance of M. flabellifolia are largely unknown, and few tolerance-related genes previously identified had been functionally characterized. WRKYs are a group of unique and complex plant transcription factors, and have reported functions in diverse biological processes, especially in the regulation of abiotic stress tolerances, in various species. However, little is known about their roles in response to abiotic stresses in M. flabellifolia. In this study, we characterized a dehydration-inducible WRKY transcription factor gene, MfWRKY17, from M. flabellifolia. MfWRKY17 shows high degree of homology with genes from Vitis vinifera and Vitis pseudoreticulata, belonging to group II of the WRKY family. Unlike known WRKY17s in other organisms acting as negative regulators in biotic or abiotic stress responses, overexpression of MfWRKY17 in Arabidopsis significantly increased drought and salt tolerance. Further investigations indicated that MfWRKY17 participated in increasing water retention, maintaining chlorophyll content, and regulating ABA biosynthesis and stress-related gene expression. These results suggest that MfWRKY17 possibly acts as a positive regulator of stress tolerance in the resurrection plant M. flabellifolia.

Heterologous Overexpression of ZmHDZIV13 Enhanced Drought and Salt Tolerance in Arabidopsis and Tobacco

2021 ◽  
Author(s):  
Fang Wang ◽  
Peng Fang ◽  
Huiping Yan ◽  
Xiangzhuo Ji ◽  
Yunling Peng
Keyword(s):  
Transcription Factor ◽  
Abiotic Stress ◽  
Salt Tolerance ◽  
Leucine Zipper ◽  
Abiotic Stress Tolerance ◽  
Heterologous Overexpression ◽  
Malondialdehyde Content ◽  
Drought And Salt Tolerance ◽  
Relative Water ◽  
Dependent Signaling Pathway

Abstract The homeodomain leucine zipper (HD-Zip) IV transcription factor is indispensable in the response of plants to abiotic stress. Systematic studies have been carried out in Arabidopsis, rice and other species from which a series of stress resistance-related genes have been isolated. However, the function of the HD-Zip-IV protein in maize is not clear. In this study, we cloned the HD-Zip-IV gene ZmHDZIV13 and identified its function in the stress response. Our phylogenetic analysis showed that ZmHDZIV13 and AtHDG11 had high homology and might have similar functions. The heterologous overexpression of ZmHDZIV13 in Arabidopsis resulted in sensitivity to abscisic acid (ABA), salt tolerance during germination and drought tolerance in seedlings. Under drought stress, the transgenic Arabidopsis showed stronger drought resistance than the wild-type showed (control). The malondialdehyde content of ZmHDZIV13 transgenic plants was lower than that of the control, and the relative water content and proline content were significantly higher than those of the control. After the drought was relieved, the expression of P5CS1, RD22, RD29B, RD29A, NCED3 and ERD1 were upregulated in transgenic Arabidopsis. Also, modified tobacco plants (35S::ZmHDZIV13) exhibited proper stomatal changes in response to drought conditions. These results show that ZmHDZIV13, as a stress-responsive transcription factor, plays a role in the positive regulation of abiotic stress tolerance and can regulate an ABA-dependent signaling pathway to regulate drought response in plants.

scholarly journals Histone Deacetylase Gene SlHDA3 Involves in ABA, Drought and Salt Response in Tomato 

2021 ◽  
Author(s):  
Jun-E Guo
Keyword(s):  
Abiotic Stress ◽  
Drought Stress ◽  
Transgenic Plants ◽  
Histone Deacetylase ◽  
Stress Responses ◽  
Abiotic Stress Tolerance ◽  
Histone Deacetylation ◽  
New Members ◽  
Modifying Factors ◽  
Mda Content

Abstract Histone deacetylation, one of vital modifying factors of post-translation modifications, which is catalyzed by histone deacetylase. The genes of histone deacetylase(HDACs) play critical roles in various stress responses. However, detailed functions for most SlHDAC members in tomato still unknown. In this work, we found that a histone deacetylase, SlHDA3, involved in response to NaCl and drought abiotic stresses. The expression of SlHDA3 was also induced significantly by NaCl, drought stress and endogenous hormone treatments. Silencing of SlHDA3 in tomato, the RNAi transgenic plants presented depressed tolerance to drought and salt stresses compared with WT tomato. The results of sensitivity analysis indicated that the length of hypocotyl and roots in RNAi plants were more inhibited by ABA and salt stress than that of WT at post-germination stage. Worse growth status were exhibited in SlHDA3 transgenic plants under salt and drought stress as are evaluated by a series of physiological parameters related to stress responses, such as decreased RWC, survival rate, ABA content, chlorophyll content and CAT activity, and increased MDA content and proline content. Besides, the expressions analysis of transgenic plants showed that the transcripts of genes which associated with responses to abiotic stress were down-regulated under salt-stressed conditions. To sum up, SlHDA3 acts as a stress-responsive gene, plays a role in the positive regulation of abiotic stress tolerance, and may be one of the new members in the engineering breeding of salt- and drought-tolerant tomato.

scholarly journals Association of transcription factor WRKY56 gene from Populus simonii × P. nigra with salt tolerance in Arabidopsis thaliana

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7291 ◽  
Author(s):  
Lei Wang ◽  
Wenjing Yao ◽  
Yao Sun ◽  
Jiying Wang ◽  
Tingbo Jiang
Keyword(s):  
Transcription Factor ◽  
Salt Stress ◽  
Abiotic Stress ◽  
Salt Tolerance ◽  
Stress Responses ◽  
Germination Rate ◽  
Wrky Transcription Factor ◽  
Biotic And Abiotic Stress ◽  
Populus Simonii ◽  
Reading Frame

The WRKY transcription factor family is one of the largest groups of transcription factor in plants, playing important roles in growth, development, and biotic and abiotic stress responses. Many WRKY genes have been cloned from a variety of plant species and their functions have been analyzed. However, the studies on WRKY transcription factors in tree species under abiotic stress are still not well characterized. To understand the effects of the WRKY gene in response to abiotic stress, mRNA abundances of 102 WRKY genes in Populus simonii × P. nigra were identified by RNA sequencing under normal and salt stress conditions. The expression of 23 WRKY genes varied remarkably, in a tissue-specific manner, under salt stress. Since the WRKY56 was one of the genes significantly induced by NaCl treatment, its cDNA fragment containing an open reading frame from P. simonii × P. nigra was then cloned and transferred into Arabidopsis using the floral dip method. Under salt stress, the transgenic Arabidopsis over-expressed the WRKY56 gene, showing an increase in fresh weight, germination rate, proline content, and peroxidase and superoxide dismutase activity, when compared with the wild type. In contrast, transgenic Arabidopsis displayed a decrease in malondialdehyde content under salt stress. Overall, these results indicated that the WRKY56 gene played an important role in regulating salt tolerance in transgenic Arabidopsis.

scholarly journals A Novel Sweetpotato WRKY Transcription Factor, IbWRKY2, Positively Regulates Drought and Salt Tolerance in Transgenic Arabidopsis

Biomolecules ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 506 ◽  
Author(s):  
Hong Zhu ◽  
Yuanyuan Zhou ◽  
Hong Zhai ◽  
Shaozhen He ◽  
Ning Zhao ◽  
...  
Keyword(s):  
Salt Tolerance ◽  
Ipomoea Batatas ◽  
Transgenic Arabidopsis ◽  
Abiotic Stress Tolerance ◽  
Wrky Transcription Factor ◽  
Oxygen Species ◽  
Aba Signaling ◽  
Ros Scavenging ◽  
Drought And Salt Tolerance ◽  
Transgenic Lines

WRKYs play important roles in plant growth, defense regulation, and stress response. However, the mechanisms through which WRKYs are involved in drought and salt tolerance have been rarely characterized in sweetpotato [Ipomoea batatas (L.) Lam.]. In this study, we cloned a WRKY gene, IbWRKY2, from sweetpotato and its expression was induced with PEG6000, NaCl, and abscisic acid (ABA). The IbWRKY2 was localized in the nucleus. The full-length protein exhibited transactivation activity, and its active domain was located in the N-terminal region. IbWRKY2-overexpressing Arabidopsis showed enhanced drought and salt tolerance. After drought and salt treatments, the contents of ABA and proline as well as the activity of superoxide dismutase (SOD) were higher in transgenic plants, while the malondialdehyde (MDA) and H2O2 contents were lower. In addition, several genes related to the ABA signaling pathway, proline biosynthesis, and the reactive oxygen species (ROS)-scavenging system, were significantly up-regulated in transgenic lines. These results demonstrate that IbWRKY2 confers drought and salt tolerance in Arabidopsis. Furthermore, IbWRKY2 was able to interact with IbVQ4, and the expression of IbVQ4 was induced by drought and salt treatments. These results provide clues regarding the mechanism by which IbWRKY2 contributes to the regulation of abiotic stress tolerance.

Abiotic stress tolerance and ABA responses of transgenic Glycine max plants with modulated RACK1 expression

2019 ◽  
Vol 99 (2) ◽  
pp. 250-267 ◽  
Author(s):  
Wen-Na Zheng ◽  
Da-Hong Li ◽  
Fu-Jia Chen ◽  
Xi-Ping Liu ◽  
Hong-Yan Li
Keyword(s):  
Salt Stress ◽  
Abiotic Stress ◽  
Abiotic Stress Tolerance ◽  
Dry Weight ◽  
Wild Type ◽  
Ros Scavenging ◽  
Specific Expression ◽  
Soybean Seedlings ◽  
Repeat Structure ◽  
Drought And Salt Stress

The receptor for activated C kinase 1 (RACK1) belongs to a protein subfamily that contains a tryptophan-aspartic acid-domain (WD) repeat structure. In this study, a soybean RACK1 gene (GmRACK1) was cloned. The amino acid sequence of GmRACK1 had seven WD repeats, which contained typical glycine-histidine (GH) and WD dipeptides. Tissue-specific expression showed that GmRACK1 is expressed at differential levels in all examined tissues and strongly down-regulatd by abscisic acid (ABA) and abiotic stress. Subcellular localization suggested that GmRACK1 is located in the plasma membrane, cytoplasm, and nucleus. In response to drought and salt stress, the GmRACK1-RNAi lines showed significantly higher dry weight of whole plants, chlorophyll content, and survival rate of soybean seedlings than wild-type and homozygous (OE) lines. GmRACK1-RNAi plants were observed to be more sensitive to ABA-mediated seed germination and root growth. Furthermore, we found that the level of ABA and transcript levels of stress-responsive genes were clearly up-regulated under drought and salt stress conditions in GmRACK1-RNAi plants. Consistent with the accumulation of reactive oxygen species (ROS), elevated electrolyte leakage and malondialdehyde, and lower expression of ROS-scavenging genes were found in the GmRACK1-OE lines. The GmRACK RNAi lines exhibited increased tolerance to drought and salt stress compared with the wild-type and OE lines. In addition, yeast two-hybrid assays showed that GmRACK1 could interact with WNK8, eIF6, and RbohC-N. These results therefore indicate that GmRACK1 responds to drought and salt stress through ABA signaling and the regulation of cellular ROS production in plants.

scholarly journals Genome-wide identification and analysis of WRKY gene family in maize provide insights into regulatory network in response to abiotic stresses

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Wenjing Hu ◽  
Qiaoyu Ren ◽  
Yali Chen ◽  
Guoliang Xu ◽  
Yexiong Qian
Keyword(s):  
Transcription Factor ◽  
Abiotic Stress ◽  
Gene Family ◽  
Stress Responses ◽  
Regulatory Network ◽  
Abiotic Stresses ◽  
Interaction Analysis ◽  
Expression Patterns ◽  
Wrky Transcription Factor ◽  
Rna Seq

Abstract Background The WRKY transcription factor family plays significant roles in biotic and abiotic stress responses, which has been associated with various biological processes in higher plants. However, very little is known regarding the structure and function of WRKY genes in maize. Results In this study, a total of 140 ZmWRKY proteins encoded by 125 ZmWRKY genes were eventually identified in maize. On the basis of features of molecular structure and a comparison of phylogenetic relationships of WRKY transcription factor families from Arabidopsis, rice and maize, all 140 ZmWRKY proteins in maize were divided into three main groups (Groups I, II and III) and the Group II was further classified into five subgroups. The characteristics of exon-intron structure of these putative ZmWRKY genes and conserved protein motifs of their encoded ZmWRKY proteins were also presented respectively, which was in accordance with the group classification results. Promoter analysis suggested that ZmWRKY genes shared many abiotic stress-related elements and hormone-related elements. Gene duplication analysis revealed that the segmental duplication and purifying selection might play a significant role during the evolution of the WRKY gene family in maize. Using RNA-seq data, transcriptome analysis indicated that most of ZmWRKY genes displayed differential expression patterns at different developmental stages of maize. Further, by quantitative real-time PCR analysis, twenty-one ZmWRKY genes were confirmed to respond to two different abiotic stress treatments, suggesting their potential roles in various abiotic stress responses. In addition, RNA-seq dataset was used to conduct weighted gene co-expression network analysis (WGCNA) in order to recognize gene subsets possessing similar expression patterns and highly correlated with each other within different metabolic networks. Further, subcellular localization prediction, functional annotation and interaction analysis of ZmWRKY proteins were also performed to predict their interactions and associations involved in potential regulatory network. Conclusions Taken together, the present study will serve to present an important theoretical basis for further exploring function and regulatory mechanism of ZmWRKY genes in the growth, development, and adaptation to abiotic stresses in maize.

Overexpression of a Malus baccata WRKY transcription factor gene (MbWRKY5) increases drought and salt tolerance in transgenic tobacco

2019 ◽  
Vol 99 (2) ◽  
pp. 173-183 ◽  
Author(s):  
Deguo Han ◽  
Yanjie Hou ◽  
Yufang Wang ◽  
Boxin Ni ◽  
Zitong Li ◽  
...  
Keyword(s):  
Transgenic Plants ◽  
Transgenic Tobacco ◽  
Stress Responses ◽  
Wrky Transcription Factor ◽  
Expression Levels ◽  
Drought And Salt Tolerance ◽  
Drought And Salt Stress ◽  
Drought And Salt Stresses ◽  
Stress Related Genes ◽  
Malus Baccata

WRKY transcription factors are widely involved in abiotic stress responses in plants. However, their roles in the abiotic stresses of Malus plants are still not well known. In this study, a WRKY gene is isolated from Malus baccata (L.) Borkh. and designated as MbWRKY5. MbWRKY5 contains two WRKY domains and one Cys2-His2 (C2H2) zinc-finger motif, and was localized in the nucleus. The expression levels of MbWRKY5 were up-regulated by salinity, heat, cold, drought, and abscisic acid treatments in M. baccata seedlings. When MbWRKY5 was introduced into tobacco, an improvement in tolerance to drought and salt was achieved in transgenic plants. Under drought and salt treatments, transgenic plants had higher contents of chlorophyll, proline, glutathione, and ascorbate, and increased activities of peroxidase (POD), superoxide dismutase (SOD), and catalase (CAT) than wild-type (WT) tobaccos. Compared with WT plants, overexpression of MbWRKY5 in transgenic tobacco also led to decreased levels of malondialdehyde and hydrogen peroxide (H2O2) under drought and salt stresses. Moreover, the MbWRKY5-OE tobaccos increased the expression levels of stress-related genes involved in oxidative stress response (NtPOD, NtSOD and NtCAT) and membrane protection (NtLEA5, NtERD10D, and NtP5CS), especially under drought and salt stresses. These results suggest that the MbWRKY5 gene plays a positive regulatory role in drought and salt stress responses.

scholarly journals WRKY Proteins: Signaling and Regulation of Expression during Abiotic Stress Responses

2015 ◽  
Vol 2015 ◽  
pp. 1-17 ◽  
Author(s):  
Aditya Banerjee ◽  
Aryadeep Roychoudhury
Keyword(s):  
Abiotic Stress ◽  
Stress Responses ◽  
Biotic Stress ◽  
Abiotic Stresses ◽  
Abiotic Stress Tolerance ◽  
Plant Signaling ◽  
Biological Functions ◽  
Abiotic And Biotic Stress ◽  
Regulation Of Expression ◽  
Wrky Proteins

WRKY proteins are emerging players in plant signaling and have been thoroughly reported to play important roles in plants under biotic stress like pathogen attack. However, recent advances in this field do reveal the enormous significance of these proteins in eliciting responses induced by abiotic stresses. WRKY proteins act as major transcription factors, either as positive or negative regulators. Specific WRKY factors which help in the expression of a cluster of stress-responsive genes are being targeted and genetically modified to induce improved abiotic stress tolerance in plants. The knowledge regarding the signaling cascade leading to the activation of the WRKY proteins, their interaction with other proteins of the signaling pathway, and the downstream genes activated by them are altogether vital for justified targeting of theWRKYgenes. WRKY proteins have also been considered to generate tolerance against multiple abiotic stresses with possible roles in mediating a cross talk between abiotic and biotic stress responses. In this review, we have reckoned the diverse signaling pattern and biological functions of WRKY proteins throughout the plant kingdom along with the growing prospects in this field of research.

scholarly journals Overexpression of a Novel ROP Gene from the Banana (MaROP5g) Confers Increased Salt Stress Tolerance

2018 ◽  
Vol 19 (10) ◽  
pp. 3108 ◽  
Author(s):  
Hongxia Miao ◽  
Peiguang Sun ◽  
Juhua Liu ◽  
Jingyi Wang ◽  
Biyu Xu ◽  
...  
Keyword(s):  
Salt Stress ◽  
Abiotic Stress ◽  
Salt Tolerance ◽  
Stress Tolerance ◽  
Abiotic Stress Tolerance ◽  
Survival Rates ◽  
Wild Type ◽  
Ion Distribution ◽  
Membrane Injury ◽  
Primary Roots

Rho-like GTPases from plants (ROPs) are plant-specific molecular switches that are crucial for plant survival when subjected to abiotic stress. We identified and characterized 17 novel ROP proteins from Musa acuminata (MaROPs) using genomic techniques. The identified MaROPs fell into three of the four previously described ROP groups (Groups II–IV), with MaROPs in each group having similar genetic structures and conserved motifs. Our transcriptomic analysis showed that the two banana genotypes tested, Fen Jiao and BaXi Jiao, had similar responses to abiotic stress: Six genes (MaROP-3b, -5a, -5c, -5f, -5g, and -6) were highly expressed in response to cold, salt, and drought stress conditions in both genotypes. Of these, MaROP5g was most highly expressed in response to salt stress. Co-localization experiments showed that the MaROP5g protein was localized at the plasma membrane. When subjected to salt stress, transgenic Arabidopsis thaliana overexpressing MaROP5g had longer primary roots and increased survival rates compared to wild-type A. thaliana. The increased salt tolerance conferred by MaROP5g might be related to reduced membrane injury and the increased cytosolic K+/Na+ ratio and Ca2+ concentration in the transgenic plants as compared to wild-type. The increased expression of salt overly sensitive (SOS)-pathway genes and calcium-signaling pathway genes in MaROP5g-overexpressing A. thaliana reflected the enhanced tolerance to salt stress by the transgenic lines in comparison to wild-type. Collectively, our results suggested that abiotic stress tolerance in banana plants might be regulated by multiple MaROPs, and that MaROP5g might enhance salt tolerance by increasing root length, improving membrane injury and ion distribution.

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