Mähönen A P, Bonke M, Kauppinen L, Riikonen M, Benfey P N, Helariutta Y
Plant Molecular Biology Laboratory, Institute of Biotechnology, POB 56, FIN-00014 University of Helsinki, Finland.
Genes Dev. 2000 Dec 1;14(23):2938-43. doi: 10.1101/gad.189200.
The developmental ontogeny of the vascular system (consisting of xylem, phloem and [pro]cambium) is poorly understood despite its central role in plant physiology. We show that in the Arabidopsis root meristem, xylem cell lineages are specified early, whereas phloem and procambium are established through a set of asymmetric cell divisions. These divisions require the WOODEN LEG (WOL) gene. The WOL gene encodes a novel two-component signal transducer with an unusual tandem arrangement of two receiver domains. It is expressed specifically in the vasculature from the early stages of embryogenesis on, consistent with a role as a sensor for vascular morphogenesis.
尽管维管系统(由木质部、韧皮部和[原]形成层组成)在植物生理学中起着核心作用,但其发育个体发生过程仍知之甚少。我们发现,在拟南芥根分生组织中,木质部细胞谱系早期就已确定,而韧皮部和形成层则通过一系列不对称细胞分裂建立。这些分裂需要WOODEN LEG(WOL)基因。WOL基因编码一种新型双组分信号转导子,其具有两个接收结构域的不寻常串联排列。从胚胎发生早期开始,它就在维管系统中特异性表达,这与其作为维管形态发生传感器的作用一致。