PXY, a receptor-like kinase essential for maintaining polarity during plant vascular-tissue development
PXY, a receptor-like kinase essential for maintaining polarity during plant vascular-tissue development
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DOI：
10.1016/j.cub.2007.05.049
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发表时间：
2007-06-19
期刊：
影响因子：
9.2
通讯作者：
Turner, Simon
中科院分区：
文献类型：
--
作者：
Fisher, Kate;Turner, Simon
所有的植物组织最终都来源于分生组织，控制顶端分生组织生长的分子机制已经被广泛研究（综述见[1，2]）。相比之下，很少有人关注维管分生组织，如形成层和原形成层，即使这些分生组织是木质组织的来源，因此产生了大部分的植物生物量。虽然生物质可能代表一种新的可再生能源[3]，但对维管分生组织活性的分子调控知之甚少。维管分生组织参与了一个高度有序的发育过程，具有非常突出的极性。这种极性导致分生组织原始细胞精确定向分裂，产生细胞档案，分化成高度特化和空间分离的木质部和韧皮部细胞（图1A）。建立和维持这种极性所必需的因素仍然未知。本文描述了pxy突变体的鉴定，其中维管发育的空间组织丢失，木质部和韧皮部部分散布。PXY基因编码受体样激酶（RLK），其定义了RLK在分生组织中的新作用，在分生组织中其功能是维持维管发育期间细胞分裂方向所需的细胞极性。
All plant tissue is ultimately derived from the meristems, and the molecular mechanisms that control growth of apical meristems have been widely studied (reviewed in [1, 2]). In contrast, much less attention has been paid to vascular meristems, such as the cambium and procambium, even though these meristems are the source of woody tissue and therefore generate the majority of plant biomass. Although biomass may represent a novel source of renewable energy [3], little is known about the molecular regulation of vascular-meristem activity. The vascular meristems participate in a highly ordered developmental process with a very prominent polarity. This polarity results in precisely orientated divisions of meristematic initials that generate files of cells, which differentiate into highly specialized and spatially separated xylem and phloem cells (Figure 1A). The factors that are necessary to establish and maintain this polarity remain unknown. This manuscript describes the identification of the pxy mutant in which the spatial organization of vascular development is lost and the xylem and phloem are partially interspersed. The PXY gene encodes for a receptor-like kinase (RLK) that defines a novel role for RLKs in the meristem where it functions to maintain the cell polarity required for the orientation of cell division during vascular development.