脱落酸
细胞生物学
拟南芥
警卫室
调节器
生物
磷酸化
化学
突变体
生物化学
基因
作者
Xin Yang,Lalitha Gavya S,Zimin Zhou,Daisuke Urano,On Sun Lau
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2022-10-07
卷期号:8 (40)
标识
DOI:10.1126/sciadv.add2063
摘要
Stomata, the epidermal pores for gas exchange between plants and the atmosphere, are the major sites of water loss. During water shortage, plants limit the formation of new stoma via the phytohormone abscisic acid (ABA) to conserve water. However, how ABA suppresses stomatal production is largely unknown. Here, we demonstrate that three core SnRK2 kinases of ABA signaling inhibit the initiation and proliferation of the stomatal precursors in Arabidopsis . We show that the SnRK2s function within the precursors and directly phosphorylate SPEECHLESS (SPCH), the master transcription factor for stomatal initiation. We identify specific SPCH residues targeted by the SnRK2s, which mediate the ABA/drought-induced suppression of SPCH and stomatal production. This SnRK2-specific SPCH phosphocode connects stomatal development with ABA/drought signals and enables the independent control of this key water conservation response. Our work also highlights how distinct signaling activities can be specifically encoded on a master regulator to modulate developmental plasticity.
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