警卫室
变硬
生物
拟南芥
细胞生物学
极地的
植物
细胞壁
转录因子
Guard(计算机科学)
生物物理学
基因
遗传学
材料科学
计算机科学
物理
天文
突变体
复合材料
程序设计语言
作者
Zong Lin,Yajuan Chen,Liping Ding,Ying Zhou,Shuwen Xue,Biying Li,Jianhua Wei,Hongzhi Wang
出处
期刊:The Plant Cell
[Oxford University Press]
日期:2023-07-12
卷期号:35 (10): 3757-3781
标识
DOI:10.1093/plcell/koad198
摘要
Abstract The mechanical properties of guard cells have major effects on stomatal functioning. Reinforced stiffness in the stomatal polar regions was recently proposed to play an important role in stomatal function, but the underlying molecular mechanisms remain elusive. Here, we used genetic and biochemical approaches in poplar (Populus spp.) to show that the transcription factor MYB156 controls pectic homogalacturonan–based polar stiffening through the downregulation of the gene encoding pectin methylesterase 6 (PME6). Loss of MYB156 increased the polar stiffness of stomata, thereby enhancing stomatal dynamics and response speed to various stimuli. In contrast, overexpression of MYB156 resulted in decreased polar stiffness and impaired stomatal dynamics, accompanied by smaller leaves. Polar stiffening functions in guard cell dynamics in response to changing environmental conditions by maintaining normal stomatal morphology during stomatal movement. Our study revealed the structure–function relationship of the cell wall of guard cells in stomatal dynamics, providing an important means for improving the stomatal performance and drought tolerance of plants.
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