AP2基因决定拟南芥花中花被器官的特性。
AP2 Gene Determines the Identity of Perianth Organs in Flowers of Arabidopsis thaliana.
作者信息
Kunst L., Klenz J. E., Martinez-Zapater J., Haughn G. W.
机构信息
Biology Department, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 0W0, Canada.
出版信息
Plant Cell. 1989 Dec;1(12):1195-1208. doi: 10.1105/tpc.1.12.1195.
Abstract
We have examined the floral morphology and ontogeny of three mutants of Arabidopsis thaliana, Ap2-5, Ap2-6, and Ap2-7, that exhibit homeotic changes of the perianth organs because of single recessive mutations in the AP2 gene. Homeotic conversions observed are: sepals to carpels in all three mutants, petals to stamens in Ap2-5, and petals to carpels in Ap2-6. Our analysis of these mutants suggests that the AP2 gene is required early in floral development to direct primordia of the first and second whorls to develop as perianth rather than as reproductive organs. In addition, our results support one of the two conflicting hypotheses concerning the structures of the calyx and the gynoecium in the Brassicaceae.
摘要
我们研究了拟南芥三个突变体Ap2-5、Ap2-6和Ap2-7的花形态和个体发育，这些突变体由于AP2基因中的单隐性突变而表现出花被器官的同源异型变化。观察到的同源异型转变为：在所有三个突变体中萼片转变为心皮，在Ap2-5中花瓣转变为雄蕊，在Ap2-6中花瓣转变为心皮。我们对这些突变体的分析表明，AP2基因在花发育早期是必需的，以引导第一和第二轮的原基发育为花被而不是生殖器官。此外，我们的结果支持了关于十字花科花萼和雌蕊结构的两个相互矛盾的假说中的一个。
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