title: Overexpression of the MYB37 transcription factor enhances abscisic acid sensitivity, and improves both drought tolerance and seed productivity in Arabidopsis thaliana.
abstract: Although a lot of genes have been revealed to participate in abscisic acid (ABA) signaling, many of the additional components involved in ABA signaling remain to be discovered. Here we report that overexpression of MYB37, a R2R3 MYB subgroup 14 transcription factor in Arabidopsis thaliana, confers hypersensitive phenotypes to exogenous ABA in all the major ABA responses, including ABA-induced inhibition of seed germination, cotyledon greening and early seedling growth, and ABA-induced stomatal closure and inhibition of stomatal opening. Interestingly and importantly, MYB37-overexpression improves plant tolerance to drought, enhances growth of mature plants and seed productivity, thought it delays flowering, which suggests that this gene may be used for improving crop adaptability to drought environment and productivity. However, a myb37-1 knockout mutant displays wild-type ABA responses most likely due to a functional redundancy of the multiple MYB members. Real-time PCR analysis shows that upregulation of the MYB37 expression changes expression of a subset of ABA-responsive genes. Together, these findings suggest that the MYB37 transcription factor plays an important, positive role in plant response to ABA and drought stress, and meanwhile, it plays a positive role in the regulation of seed production.
authors.affiliation: Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China.
authors.forename: Yong-Tao
authors.initials: YT
authors.lastname: Yu
authors.affiliation: Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wu
authors.affiliation: Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Lu
authors.affiliation: Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Bi
authors.affiliation: Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China.
authors.forename: Shan
authors.initials: S
authors.lastname: Liang
authors.affiliation: Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China. wangxf@biomed.tsinghua.edu.cn.
authors.forename: Xiao-Fang
authors.initials: XF
authors.lastname: Wang
authors.affiliation: Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China. zhangdp@mail.tsinghua.edu.cn.
authors.forename: Da-Peng
authors.initials: DP
authors.lastname: Zhang
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology*; D017360:Arabidopsis / Q000187:drug effects* / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D055864:Droughts; D035264:Flowers / Q000187:drug effects / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D018506:Gene Expression Regulation, Plant / Q000187:drug effects / Q000235:genetics; D018525:Germination / Q000187:drug effects / Q000235:genetics; D012639:Seeds / Q000187:drug effects / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*
chemical_list: D029681:Arabidopsis Proteins; C510420:RAX1 protein, Arabidopsis; D014157:Transcription Factors; D000040:Abscisic Acid
keywords: Abscisic acid; Arabidopsis thaliana; Drought stress; Late flowering; MYB37 transcription factor; Seed production