Overexpression of the MYB transcription factor MYB28 or MYB99 confers hypersensitivity to abscisic acid in arabidopsis

The phytohormone abscisic acid (ABA) plays a vital role in plant development and response to abiotic stress, and many components in ABA signaling remain to be discovered to fully understand the highly complex ABA signaling network. Here we reported that over-expression of MYB28 or MYB99 , two R2R3 M...

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Bibliographic Details
Published in:Journal of plant biology = Singmul Hakhoe chi 2016, 59(2), , pp.152-161
Main Authors: Yu, Yong-Tao, Wu, Zhen, Lu, Kai, Bi, Chao, Liang, Shan, Wang, Xiao-Fang, Zhang, Da-Peng
Format: Article
Language:English
Subjects:
Abscisic acid
Biomedical and Life Sciences
Germination
Hypersensitivity
Life Sciences
Original Article
Overexpression
Phenotypes
Plant Breeding/Biotechnology
Plant Ecology
Plant Genetics and Genomics
Plant hormones
Plant Sciences
Plant Systematics/Taxonomy/Biogeography
Redundancy
Seed germination
Seedlings
Transcription factors
생물학
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Summary:The phytohormone abscisic acid (ABA) plays a vital role in plant development and response to abiotic stress, and many components in ABA signaling remain to be discovered to fully understand the highly complex ABA signaling network. Here we reported that over-expression of MYB28 or MYB99 , two R2R3 MYB transcription factors in Arabidopsis thaliana , confers hypersensitivity to exogenous ABA during seed germination, cotyledon greening and early seedling growth. However, both myb28-1 and myb99-1 knockout mutants exhibit wild-type ABA phenotypes most likely due to a functional redundancy of the multiple MYB members. Real-time PCR analysis shows that over-expression of the MYB28 or MYB99 changes expression of a subset of ABA-responsive genes. Collectively, these findings suggest that MYB28 and MYB99 play important, positive roles in ABA signaling during seed germination and early seedling growth.
ISSN:1226-9239
1867-0725
DOI:10.1007/s12374-016-0463-z