Institut für Genetik, Heinrich-Heine Universität, Universitätsstr. 1, D-40225 Düsseldorf, Germany.
Curr Opin Plant Biol. 2010 Feb;13(1):53-8. doi: 10.1016/j.pbi.2009.09.008. Epub 2009 Oct 15.
Primary plant meristems are the shoot and root meristems that are initiated at opposite poles of the plant embryo. They contain stem cells, which remain undifferentiated, and supply new cells for growth and the formation of tissues. The maintenance of a long-lasting stem cell population in meristems is achieved by signal exchange between organizing regions and the stem cells, and also by feedback signals emanating from differentiating cells. Related peptide signals that make use of different receptor classes were found to control the stem cell populations in both meristem types by regulating evolutionarily conserved homeodomain transcription factors. The precise interplay of auxin and cytokinin signaling pathways is central to keep cells in the meristem, or direct them toward differentiation.
初生植物分生组织是在植物胚胎的相对两端起始的茎尖分生组织和根端分生组织。它们包含干细胞，这些细胞保持未分化状态，并为生长和组织形成提供新的细胞。通过组织区域和干细胞之间的信号交换，以及来自分化细胞的反馈信号，分生组织中持久的干细胞群体得以维持。利用不同受体类别的相关肽信号被发现通过调节进化上保守的同源域转录因子来控制两种分生组织类型中的干细胞群体。生长素和细胞分裂素信号通路的精确相互作用是将细胞保持在分生组织中或将其定向分化的核心。
