Dolan L, Scheres B
Department of Cell Biology, John Innes Centre, Norwich, UK.
Semin Cell Dev Biol. 1998 Apr;9(2):201-6. doi: 10.1006/scdb.1997.0211.
Root pattern formation takes place in the embryo and is propagated through subsequent growth and development of the seedling root meristem. Pattern is maintained by positional cues and in some cases by local cell interactions. Such interactions are involved in the balance between cell division and differentiation in cells neighbouring the quiescent centre. This balancing act also occurs in the shoot in which the genetic circuitry underpinning this phenomenon has been characterised. The common genetic mechanism of patterned cell differentiation in the epidermis between the root and shoot extends these parallels further. Given that these shared mechanisms exist, it is tempting to speculate that they reflect the fact that roots may be derived, shoot structures. Alternatively such mechanisms may reflect an evolutionary convergence of genetic mechanism.
根模式的形成发生在胚胎中，并通过幼苗根分生组织随后的生长和发育得以延续。模式由位置线索维持，在某些情况下由局部细胞相互作用维持。这种相互作用参与了静止中心附近细胞的细胞分裂和分化之间的平衡。这种平衡行为也发生在茎中，支撑这一现象的遗传回路已得到表征。根和茎表皮中模式化细胞分化的共同遗传机制进一步扩展了这些相似之处。鉴于存在这些共同机制，不禁推测它们反映了根可能源自茎结构这一事实。或者，这些机制可能反映了遗传机制的进化趋同。
