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An Arabidopsis R2R3-MYB transcription factor, AtMYB20, negatively regulates type 2C serine/threonine protein phosphatases to enhance salt tolerance

Authors
Cui, Mei HuaYoo, Kyoung ShinHyoung, SujinHa Thi Kim NguyenKim, Yun YoungKim, Hae JinOk, Sung HanYoo, Sang DongShin, Jeong Sheop
Issue Date
19-6월-2013
Publisher
WILEY
Keywords
Abscisic acid; MYB family; Salt stress; Type 2C serine/threonine protein phosphatase
Citation
FEBS LETTERS, v.587, no.12, pp.1773 - 1778
Indexed
SCIE
SCOPUS
Journal Title
FEBS LETTERS
Volume
587
Number
12
Start Page
1773
End Page
1778
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/102953
DOI
10.1016/j.febslet.2013.04.028
ISSN
0014-5793
Abstract
We have characterized the function of a plant R2R3-MYB transcription factor, Arabidopsis thaliana MYB20 (AtMYB20). Transgenic plants overexpressing AtMYB20 (AtMYB20-OX) enhanced salt stress tolerance while repression lines (AtMYB20-SRDX) were more vulnerable to NaCl than wild-type plants. Following NaCl treatment, the expressions of ABI1, ABI2 and AtPP2CA, which encode type 2C serine/threonine protein phosphatases (PP2Cs) that act as negative regulators in abscisic acid (ABA) signaling, were suppressed in AtMYB20-OX but induced in AtMYB20-SRDX. The electrophoretic mobility shift assay results revealed that AtMYB20 binds to the promoter regions containing the MYB recognition sequence (TAACTG) and an ACGT core element of ABI1 and AtPP2CA. These findings suggest that AtMYB20 down-regulates the expression of PP2Cs, the negative regulator of ABA signaling, and enhances salt tolerance. (C) 2013 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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생명과학대학 (생명과학부)
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