PLASTOCHRON2 regulates leaf initiation and maturation in rice
PLASTOCHRON2 regulates leaf initiation and maturation in rice
复制标题
DOI：
10.1105/tpc.105.037622
复制
发表时间：
2006-03-01
期刊：
影响因子：
11.6
通讯作者：
Nagato, Y
中科院分区：
文献类型：
--
作者：
Kawakatsu, T;Itoh, J;Nagato, Y
在高等植物中，叶片的萌发具有恒定的时空模式。虽然叶片形成模式是植物芽结构的一个关键因素，但人们对叶片形成事件之间的时间间隔（称为质体时间）是如何调节的知之甚少。在这里，我们详细分析了水稻（Oryza sativa）突变体plastochron2 (pla2)，该突变体在营养期表现出缩短的质体时间和叶片早熟成熟，在生殖期表现出异位芽形成。相应的PLA2基因被发现是末端ear1基因的同源物，ear1是一个编码me2样RNA结合蛋白的玉米（Zea mays）基因。PLA2主要在幼叶原基中表达。我们发现，PLA2通常会延缓叶片成熟的速度，但它独立于编码P450家族成员的PLA1起作用。基于这些分析，我们提出了一个模型，其中质体是由未成熟叶片的信号决定的，这些信号在茎尖分生组织中非细胞自主地抑制新叶的形成。
In higher plants, leaves initiate in constant spatial and temporal patterns. Although the pattern of leaf initiation is a key element of plant shoot architecture, little is known about how the time interval between initiation events, termed plastochron, is regulated. Here, we present a detailed analysis of plastochron2 (pla2), a rice (Oryza sativa) mutant that exhibits shortened plastochron and precocious maturation of leaves during the vegetative phase and ectopic shoot formation during the reproductive phase. The corresponding PLA2 gene is revealed to be an orthologue of terminal ear1, a maize (Zea mays) gene that encodes a MEI2-like RNA binding protein. PLA2 is expressed predominantly in young leaf primordia. We show that PLA2 normally acts to retard the rate of leaf maturation but does so independently of PLA1, which encodes a member of the P450 family. Based on these analyses, we propose a model in which plastochron is determined by signals from immature leaves that act non-cell-autonomously in the shoot apical meristem to inhibit the initiation of new leaves.