A new loss-of-function allele 28y reveals a role of ARGONAUTE1 in limiting asymmetric division of stomatal lineage ground cell

查看全文 作　　者：Kezhen [1]Yangy;Min [1]Jiangy;Jie [1]Le

机构地区：[1]Key Laboratory of Plant Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences

出　　处：《Journal of Integrative Plant Biology》索引2014年第56卷第6期,共11页

基　　金：supported by grants from the National Natural Science Foundation of China, 30971652 and 31271463 (J. L.), 31071198 (K. Y.);Hundred Talents Program andKSCX2-YW-N- 073 from the Chinese Academy of Sciences 摘　　要：In Arabidopsis thaliana L., stomata are produced through a series of divisions including asymmetric and symmetric divisions. Asymmetric entry division of meristemoid mother cell produces two daughter cells, the smaller meristemoid and the larger sister cell, a stomatal lineage ground cell(SLGC). Stomatal lineage ground cells can differentiate into epidermal pavement cells but have the potential to divide asymmetrically, spacing divisions, to create satellite meristemoids. Peptide ligands and TOO MANY MOUTHS(TMM) and ERECTA family receptors regulate the initiation of stomatal lineages, activity, and orientation of spacing divisions. Here, we reported that a natural mutant 28 y displayed an increased stomatal density and index. Using map-based cloning, we identified mutation in ARGONAUTE1(AGO1)as the cause of 28 y phenotypes. Time-lapse tracing of stomatal lineage cells reveals that stomatal overproduction in 28 y is caused by the excessive asymmetric spacing division of SLGCs.Further genetic results demonstrated that AGO1 acts downstream of TMM and negatively regulates the SPCH transcripts,but in a brassinosteroid-independent manner. Upregulation of AGAMOUS-LIKE16(AGL16) in 28 y mutants suggests that AGO1 is required to restrict AGL16-mediated stomatal spacing divisions,an miRNA pathway in addition to ligand-receptor signaling modules. 关键词：不对称分裂气孔密度细胞谱系地面新基因间距分割油菜素类固醇

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A new loss-of-function allele 28y reveals a role of ARGONAUTE1 in limiting asymmetric division of stomatal lineage ground cell

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