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The specialized plant leaf epidermal cells develop into pavement cells with complex interdigitated jigsaw puzzle-like structures through polarized growth. Their morphogenesis is primarily orchestrated by Rho-related GTPases of plants (ROP) signaling, which integrates signaling mechanism networks such as hormones, cytoskeletal reorganization, and mechanical stress responses. This review systematically elucidates the mechanisms by which brassinosteroids (BRs) and auxin synergizing with PHGAPs-ROP signaling to regulate the morphogenesis of pavement cells. In particular, it characterizes the molecular mechanism through which BR signaling negatively regulates ROP2 activity via PHGAPs. Through identifying PHGAPs as a pivotal node, this review refines the multi-signaling pathway coordinated regulatory model of pavement cells morphogenesis and provides a comprehensive theoretical framework for deciphering crosstalk mechanism between PHGAPs-ROP and various signaling pathways, as well as mechanical signal sensing mechanism.
, authors=Shuning ZHANG
1, Xiaoru YI
1, Meiyan ZOU
1, Deshu LIN
2, Jiakai LIAO
2, *, authorsList=Shuning ZHANG, Xiaoru YI, Meiyan ZOU, Deshu LIN, Jiakai LIAO, authorCompany=null, correspAuthors=Jiakai LIAO, authorNote=null, correspAuthorsNote=
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植物叶片表皮特化而成的铺板细胞通过极性生长形成复杂的相互嵌合拼图状结构。这类细胞形态建成调控主要以Rho-related GTPases of plants(ROP)信号为核心,交织着激素、细胞骨架重排和机械应力响应等信号机制网络。本综述系统阐述了油菜素甾醇(brassinosteroids,BRs)与生长素协同PLECKSTRIN HOMOLOGY GTPase-ACTIVATING Proteins(PHGAPs)-ROP信号调控铺板细胞形态建成的机制,并重点解析BR信号通过PHGAPs负调控ROP2活性的分子机制。通过PHGAPs这一关键节点,完善了铺板细胞形态建成的多信号通路协调控制模型,也为深入解析PHGAPs-ROP与各信号通路交叉对话机制及与机械力信号感知机制提供了理论基础。
, authors=张舒宁
1, 易小茹
1, 邹美燕
1, 林德书
2, 廖家凯
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植物铺板细胞形态建成的信号调控网络图中2个相邻铺板细胞(Cell 1和Cell 2)中PHGAPs-ROP介导的形态建成调控网络模式。细胞嵌合生长的发生主要依赖于凸起区活性ROP2-RIC4引起的微丝聚合与凹陷区活性ROP6-RIC1调控的微管聚合,以及ROP2-RIC4与ROP6-RIC1存在的空间拮抗作用。油菜素甾醇(BRs)介导的空间抑制(图上方):当BR信号较弱时,Cell 1中BIN2处于磷酸化激活状态,能够将PHGAPs招募至质膜并诱导其磷酸化,磷酸化的PHGAPs通过局部抑制ROP2的活性而减弱其对ROP6的拮抗作用,使ROP6在该信号域占据主导优势。活性ROP6经RIC1招募KATANIN等蛋白,组织皮层微管(MTs)的有序排列以限制该区域细胞的生长而形成凹陷区。反之,当BR信号较强时,与Cell 1相对应的Cell 2区域中BIN2被去磷酸化而失去激酶活性,未磷酸化的PHGAPs蛋白发生降解,解除对ROP2的抑制,此时活化的ROP2不断积累而加强了对ROP6活性的抑制,使得该区域内ROP2信号占据优势。激活的ROP2与其效应蛋白RIC4结合,促进皮层肌动蛋白丝的组装,进而促进该区域细胞的生长而产生凸起。生长素(Auxin)介导的正反馈激活(图下方):生长素经受体ABP1传递至细胞内激活凸起区ROP2及相邻细胞凹陷区ROP6,活性ROP2-RIC4促进肌动蛋白丝(F-actin)聚合,驱动细胞膜延伸并抑制PIN1的内吞作用。驻留质膜的PIN1持续将过量的生长素泵向胞外,与此同时活化的ROP6与ROP2还存在相互拮抗作用,通过反馈调节维持ROP2活性的极性分布。综上所述,BR通路介导的空间抑制与生长素驱动的局部反馈调节协同构建了ROP信号的空间异质性,通过差异化调控微管/微丝骨架,最终塑造了铺板细胞嵌合的拼图形态。示意图使用BioGDP.com绘制(Jiang等2025)。
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