Canales Claudia, Grigg Stephen, Tsiantis Miltos
Department of Plant Sciences, University of Oxford, Oxford, OX1 3RB, UK.
Planta. 2005 Aug;221(6):752-6. doi: 10.1007/s00425-005-1549-x. Epub 2005 May 21.
Leaves, the plant's major photosynthetic organs, form through the activity of groups of pluripotent cells, termed shoot apical meristems (SAMs), located at the growing tips of plants. Leaves develop with a dorso-ventral asymmetry, with the adaxial surface adjacent to the meristem and the abaxial surface developing at a distance from it. Molecular genetic studies have shown that the correct specification of adaxial/abaxial polarity requires communication between the incipient leaf and the meristem, and that the juxtaposition of adaxial/abaxial fates is necessary for lamina outgrowth (Waites and Hudson 1995; McConnell et al. 2001). Over the last few years, a number of factors that control cell fate specification in the apex have been identified. This review will focus on recent advances on distinct but overlapping aspects of leaf development, namely, the transition from meristem to leaf fate and the specification of abaxial/adaxial polarity and its possible role in leaf growth.
叶片是植物主要的光合器官，由位于植物生长顶端的多能细胞群（称为茎尖分生组织，SAMs）的活动形成。叶片发育具有背腹不对称性，近轴面与分生组织相邻，远轴面则在离分生组织一定距离处发育。分子遗传学研究表明，近轴/远轴极性的正确特化需要初始叶片与分生组织之间的信号传导，并且近轴/远轴命运的并置对于叶片的扩展是必要的（Waites和Hudson，1995年；McConnell等人，2001年）。在过去几年中，已经鉴定出一些控制顶端细胞命运特化的因子。本综述将聚焦于叶片发育中不同但相互重叠方面的最新进展，即从分生组织到叶片命运的转变、远轴/近轴极性的特化及其在叶片生长中的可能作用。
