| |
|
|
| |
|
|
Research  |
|
|
|
| |
| |
The MYB96 Transcription Factor Mediates Abscisic Acid Signaling during Drought Stress Response in Arabidopsis1[W]
|
|
|
|
|
|
| |
|
 Authours
|
Pil Joon Seo2, Fengning Xiang2, Meng Qiao, Ju-Young Park, Young Na Lee, Sang-Gyu Kim, Yong-Hwan Lee, Woong June Park, and Chung-Mo Park* |
| Title |
The MYB96 Transcription Factor Mediates Abscisic Acid Signaling during Drought Stress Response in Arabidopsis1[W] |
| Journal |
PLANT PHYSIOL, 2009 (151) ~ |
Abstract
|
Plant adaptive responses to drought are coordinated by adjusting growth and developmental processes as well as molecular
and cellular activities. The root system is the primary site that perceives drought stress signals, and its development is
profoundly affected by soil water content. Various growth hormones, particularly abscisic acid (ABA) and auxin, play a critical
role in root growth under drought through complex signaling networks. Here, we report that a R2R3-type MYB transcription
factor, MYB96, regulates drought stress response by integrating ABA and auxin signals. The MYB96-mediated ABA signals are
integrated into an auxin signaling pathway that involves a subset of GH3 genes encoding auxin-conjugating enzymes. A
MYB96-overexpressing Arabidopsis (Arabidopsis thaliana) mutant exhibited enhanced drought resistance with reduced lateral
roots. In the mutant, while lateral root primordia were normally developed, meristem activation and lateral root elongation
were suppressed. In contrast, a T-DNA insertional knockout mutant was more susceptible to drought. Auxin also induces
MYB96 primarily in the roots, which in turn induces the GH3 genes and modulates endogenous auxin levels during lateral root
development. We propose that MYB96 is a molecular link that mediates ABA-auxin cross talk in drought stress response and
lateral root growth, providing an adaptive strategy under drought stress conditions. |
Link
|
 |
|
|
| |
|
|
|
|
| |
|
|
|
|
