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The MdWRKY31 transcription factor binds to the MdRAV1 promoter to mediate ABA sensitivity
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The MdWRKY31 transcription factor binds to the MdRAV1 promoter to mediate ABA sensitivity
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Journal Article
The MdWRKY31 transcription factor binds to the MdRAV1 promoter to mediate ABA sensitivity
2019
Overview
The phytohormone abscisic acid (ABA) is a major element involved in apple (
Malus domestica
) production because of its role in seed germination and early seedling development. The WRKY family, which is one of the largest families of transcription factors, plays an important role in ABA signaling in plants. However, the underlying molecular mechanisms of WRKY-mediated ABA sensitivity in apple are poorly understood. A genome-wide transcriptome analysis indicated that
MdWRKY31
is a key factor induced by ABA. Quantitative real-time PCR showed that
MdWRKY31
is induced by ABA in response to PEG4000, which is used to simulate drought. As a transcription factor, MdWRKY31 is localized in the nucleus. Ectopic expression of
MdWRKY31
in
Arabidopsis
and
Nicotiana benthamiana
enhanced plant sensitivity to ABA. Overexpression of
MdWRKY31
in apple roots and apple calli increased sensitivity to ABA, whereas repression of
MdWRKY31
reduced sensitivity to ABA in the roots of ‘Royal Gala’. Electrophoretic mobility shift assays, chromatin immunoprecipitation PCR, and yeast one-hybrid assays indicated that MdWRKY31 directly binds to the promoter of
MdRAV1
. Expression analyses of transgenic apple calli containing
MdWRKY31
and
pMdRAV1::GUS
implied that MdWRKY31 represses the expression of
MdRAV1
. We also found that MdRAV1 binds directly to the promoters of
MdABI3
and
MdABI4
and repressed their expression. Our findings reveal a new important regulatory mechanism of MdWRKY31-MdRAV1-MdABIs in the ABA signaling pathway in apple.
Publisher
Nature Publishing Group UK,Oxford University Press
Subject
