Role of pepper MYB transcription factor CaDIM1 in regulation of the drought response

Abscisic acid (ABA) is a major phytohormone that plays important roles in stress responses, including regulation of gene expression and stomatal closure. Regulation of gene expression by transcription factors is a key cellular process for initiating defense responses to biotic and abiotic stresses....

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Published in:Frontiers in plant science 2022-10, Vol.13, p.1028392-1028392
Main Authors: Lim, Junsub, Lim, Chae Woo, Lee, Sung Chul
Format: Article
Language:English
Subjects:
ABA
drought
MYB
pepper
Plant Science
transcription factor
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Summary:Abscisic acid (ABA) is a major phytohormone that plays important roles in stress responses, including regulation of gene expression and stomatal closure. Regulation of gene expression by transcription factors is a key cellular process for initiating defense responses to biotic and abiotic stresses. Here, using pepper ( Capsicum annuum ) leaves, we identified the MYB transcription factor CaDIM1 ( Capsicum annuum Drought I nduced MYB 1), which was highly induced by ABA and drought stress. CaDIM1 has an MYB domain in the N-terminal region and an acidic domain in the C-terminal region, which are responsible for recognition and transactivation of the target gene, respectively. Compared to control plants, CaDIM1 -silenced pepper plants displayed ABA-insensitive and drought-sensitive phenotypes with reduced expression of stress-responsive genes. On the other hand, overexpression of CaDIM1 in Arabidopsis exhibited the opposite phenotypes of CaDIM1 -silenced pepper plants, accompanied by enhanced ABA sensitivity and drought tolerance. Taken together, we demonstrate that CaDIM1 functions as a positive regulator of the drought-stress response via modulating ABA-mediated gene expression.
ISSN:1664-462X
1664-462X
DOI:10.3389/fpls.2022.1028392