LAX PANICLE2 of Rice Encodes a Novel Nuclear Protein and Regulates the Formation of Axillary Meristems
LAX PANICLE2 of Rice Encodes a Novel Nuclear Protein and Regulates the Formation of Axillary Meristems
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DOI：
10.1105/tpc.111.088765
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发表时间：
2011-09-01
期刊：
影响因子：
11.6
通讯作者：
Sato, Yutaka
中科院分区：
文献类型：
--
作者：
Tabuchi, Hiroaki;Zhang, Yu;Sato, Yutaka
高等植物的地上结构依赖于顶端分生组织(SAM)和腋生分生组织(AM)的活性。SAM产生主枝和叶原基，而AM在叶原基的腋处产生，形成枝条和花。因此，AM的形成是构建植物建筑的关键一步。在这里，我们描述了水稻(Oryza Sativa)lax panicle2(Lax2)突变体，它改变了AM的形成。LAX2调节水稻植株地上部分在整个植株发育过程中的分枝，但穗部的初级分枝除外。Lax2突变体与lax panicle1(Lax1)的相似之处在于，它在穗的大部分侧枝中缺乏AM，并且在营养阶段AM数量减少。Lax1-lax2双突变体协同增强了减少分枝的表型，表明存在多条分枝途径。LAX2编码一种核蛋白，含有植物特有的保守结构域，并与LAX1物理上相互作用。我们认为LAX2是一个与LAX1共同作用于水稻AM形成过程的新因子。
Aerial architecture in higher plants is dependent on the activity of the shoot apical meristem (SAM) and axillary meristems (AMs). The SAM produces a main shoot and leaf primordia, while AMs are generated at the axils of leaf primordia and give rise to branches and flowers. Therefore, the formation of AMs is a critical step in the construction of plant architecture. Here, we characterized the rice (Oryza sativa) lax panicle2 (lax2) mutant, which has altered AM formation. LAX2 regulates the branching of the aboveground parts of a rice plant throughout plant development, except for the primary branch in the panicle. The lax2 mutant is similar to lax panicle1 (lax1) in that it lacks an AM in most of the lateral branching of the panicle and has a reduced number of AMs at the vegetative stage. The lax1 lax2 double mutant synergistically enhances the reduced-branching phenotype, indicating the presence of multiple pathways for branching. LAX2 encodes a nuclear protein that contains a plant-specific conserved domain and physically interacts with LAX1. We propose that LAX2 is a novel factor that acts together with LAX1 in rice to regulate the process of AM formation.