茉莉酸
生物
脱落酸
警卫室
转录因子
细胞生物学
调节器
转录组
耐旱性
信号转导
拟南芥
植物
生物化学
基因表达
基因
突变体
作者
Wenchao Zhao,Huang Huang,Jingjing Wang,Xiaoyun Wang,Bing-Qin Xu,Xuehui Yao,Lulu Sun,Jing Wang,Jianli Wang,Aidong Sun,Shaohui Wang
出处
期刊:Plant Journal
[Wiley]
日期:2022-12-19
卷期号:113 (3): 546-561
被引量:20
摘要
SUMMARY The jasmonic acid (JA) signaling pathway is involved in the plant response to drought stress. JA and other hormones synergistically regulate the drought response in plants. However, the molecular mechanism underlying this synergism remains poorly defined. In the present study, transcriptome analyses of guard cells and quantitative PCR experiments revealed that MYC2 negatively regulated the negative regulator of ABA signaling, SlPP2C1 , and the type‐B response regulator in the cytokinin pathway, SlRR26 , and this negative regulation was direct. SlRR26 overexpression reduced drought tolerance in transgenic tomatoes, whereas slrr26 cr lines were more tolerant to drought. SlRR26 negatively modulated reactive oxygen species levels in stomata and stomatal closure through RobhB . Moreover, SlRR26 overexpression counteracted JA‐mediated stomatal closure, suggesting that SlRR26 played a negative role in the JA‐mediated drought response. These findings suggest that MYC2 plays a key role in JA‐regulated stomatal closure under drought stress by inhibiting SlPP2C1 and SlRR26 .
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