Jodrell Laboratory, Royal Botanic Gardens Kew, Richmond, Surrey TW9 3AB, UK.
Curr Opin Plant Biol. 2010 Feb;13(1):108-14. doi: 10.1016/j.pbi.2009.09.019. Epub 2009 Oct 21.
Understanding floral patterning is a primary goal in plant biology, yet the temporal sequence of organ development is rarely factored into developmental models. In flowers, occasional examples of centrifugal or basipetal organ initiation, both within organ zones (intrazonal) and between them (interzonal), present a paradox with respect to developmental models. A centripetal/acropetal sequence of floral organ initiation is ancestral in angiosperms, but centrifugal/basipetal development has evolved many times, indicating that these apparently major developmental shifts have relatively simple genetic triggers. Review of the sequence of organ initiation in angiosperms supports evidence that the four floral organ types develop independently of each other, in response to genetic factors that predetermine radial patterning.
理解花部形态发生是植物生物学的主要目标，但器官发育的时间顺序很少被纳入发育模型中。在花中，器官发生的偶尔离心或向基例子，无论是在器官区内（区内）还是区之间（区间），都与发育模型产生了矛盾。向心/向顶的花部器官发生顺序是被子植物的祖征，但离心/向基的发育已经进化了很多次，表明这些明显的主要发育转变具有相对简单的遗传触发因素。对被子植物器官发生顺序的回顾支持了这样的证据，即四个花部器官类型彼此独立发育，对预先确定辐射模式的遗传因素作出反应。
