Cytokinin Perception Also Starts at the Plasma Membrane

• 作者: M. Arif Ashraf
• 来源期刊: 分子植物（英文版）
• 年，卷（期）: 2020,（11）
• 所属期刊栏目: Editor's Highlights
• 页码范围: 1534
• 页数: 1页
• 语种: 英文

摘要

The plant hormone cytokinin regulates diverse biological pro-cesses,including embryogenesis,cell division and differentia-tion,root and shoot architecture,vascular development,and formation of shoot and root lateral organs.The endoplasmic retic-ulum(ER)is considered as the primary cytokinin perception site based on the known subcellular localization of the cytokinin re-ceptors.In the canonical cytokinin signaling pathway,the percep-tion of cytokinin starts with the CHASE domain-containing AHK(Arabidopsis histidine kinase)receptors,which are located primar-ily in the ER.Upon perception through AHKs,AHPs(Arabidopsis histidine phosphotransferases)act as intermediates to transfer a phosphate from AHKs to the downstream type B ARRs(Arabidop-sis response regulators)for initiating a cytokinin-mediated tran-scriptional response.A previous study,however,suggested that cytokinin signaling could also initiate from the plasma membrane(PM)(Zürcher et al.,2016).Two recent reports confirmed the role of PM-localized AHKs in the perception of extracellular cytokinin.