Maize LAZY1 Mediates Shoot Gravitropism and Inflorescence Development through Regulating Auxin Transport, Auxin Signaling, and Light Response
Maize LAZY1 Mediates Shoot Gravitropism and Inflorescence Development through Regulating Auxin Transport, Auxin Signaling, and Light Response
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玉米 LAZY1 通过调节生长素运输、生长素信号传导和光响应介导芽向地性和花序发育
DOI：
10.1104/pp.113.227314
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发表时间：
2013-11-01
期刊：
影响因子：
7.4
通讯作者：
Jin, Weiwei
中科院分区：
文献类型：
--
作者：
Dong, Zhaobin;Jiang, Chuan;Jin, Weiwei
生长素是一种植物激素，在植物向重力性和花序发育中起着关键作用。然而，这两个进程似乎是平行的，并由不同的行为者进行管理。在这里，我们报告说，玉米（玉米）匍匐茎突变体，这是等位基因的经典突变体懒惰plant 1（la 1），显示匍匐生长减少芽向地性和有缺陷的花序发育。图位克隆鉴定玉米ZmLA 1为LAZY 1在水稻（Oryza sativa）和拟南芥（Arabidopsis thaliana）中的功能直系同源物。它在花序发育中具有独特的作用，并在雄穗和穗等生殖器官中表现出丰富的表达。ZmLA 1的转录响应于生长素，并被光抑制。此外，ZmLA 1物理相互作用与一个假定的生长素运输调节质膜和假定的生长素信号蛋白在细胞核中。RNA-SEQ数据表明，几十个生长素运输，生长素反应，和光信号基因的差异表达在la 1突变茎。因此，ZmLA 1可能通过调节生长素的运输、生长素的信号转导以及光反应来介导玉米地上部向地性与花序发育之间的相互作用。
Auxin is a plant hormone that plays key roles in both shoot gravitropism and inflorescence development. However, these two processes appear to be parallel and to be regulated by distinct players. Here, we report that the maize (Zea mays) prostrate stem1 mutant, which is allelic to the classic mutant lazy plant1 (la1), displays prostrate growth with reduced shoot gravitropism and defective inflorescence development. Map-based cloning identified maize ZmLA1 as the functional ortholog of LAZY1 in rice (Oryza sativa) and Arabidopsis (Arabidopsis thaliana). It has a unique role in inflorescence development and displays enriched expression in reproductive organs such as tassels and ears. Transcription of ZmLA1 responds to auxin and is repressed by light. Furthermore, ZmLA1 physically interacts with a putative auxin transport regulator in the plasma membrane and a putative auxin signaling protein in the nucleus. RNA-SEQ data showed that dozens of auxin transport, auxin response, and light signaling genes were differentially expressed in la1 mutant stems. Therefore, ZmLA1 might mediate the cross talk between shoot gravitropism and inflorescence development by regulating auxin transport, auxin signaling, and probably light response in maize.