XYLEM INTERMIXED WITH PHLOEM1, a leucine-rich repeat receptor-like kinase required for stem growth and vascular development in Arabidopsis thaliana
XYLEM INTERMIXED WITH PHLOEM1, a leucine-rich repeat receptor-like kinase required for stem growth and vascular development in Arabidopsis thaliana
复制标题
DOI：
10.1007/s00425-011-1489-6
复制
发表时间：
2012-01-01
期刊：
影响因子：
4.3
通讯作者：
Tax, Frans E.
中科院分区：
文献类型：
--
作者：
Bryan, Anthony C.;Obaidi, Adam;Tax, Frans E.
植物细胞规格的调节在维管束发育中尤为重要。维管系统由木质部和韧皮部两种不同的组织类型组成，它们形成了水分、营养物质和信号分子的传导元件。原形成层位于这两种分化的细胞类型之间，并分裂以启动维管生长。我们报告了一种受体样激酶(RLK)的鉴定，它在血管系统中表达。对该激酶突变体的组织化学分析显示，韧皮部内木质化程度较高的细胞异常聚集，这是木质部或纤维细胞的典型特征。此外，在这些突变体中，韧皮部细胞有时与木质部细胞相邻。因此，我们将其命名为RLK木质部与韧皮部1混合(XIP1)。对xip1突变茎的纵向轮廓分析显示，细胞文件畸形，表明定向细胞分裂或细胞形态存在缺陷。我们认为，XIP1可以防止韧皮部细胞中的异位木质化，并且对于维持细胞卷曲的组织或传导分子中的细胞形态是必要的。
The regulation of cell specification in plants is particularly important in vascular development. The vascular system is comprised two differentiated tissue types, the xylem and phloem, which form conductive elements for the transport of water, nutrients and signaling molecules. A meristematic layer, the procambium, is located between these two differentiated cell types and divides to initiate vascular growth. We report the identification of a receptor-like kinase (RLK) that is expressed in the vasculature. Histochemical analyses of mutants in this kinase display an aberrant accumulation of highly lignified cells, typical of xylem or fiber cells, within the phloem. In addition, phloem cells are sometimes located adjacent to xylem cells in these mutants. We, therefore, named this RLK XYLEM INTERMIXED WITH PHLOEM 1 (XIP1). Analyses of longitudinal profiles of xip1 mutant stems show malformed cell files, indicating defects in oriented cell divisions or cell morphology. We propose that XIP1 prevents ectopic lignification in phloem cells and is necessary to maintain the organization of cell files or cell morphology in conductive elements.