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Schotia 和 Cynometra(豆科:金缕梅科:云实亚科)的花发育。

Floral development in Schotia and Cynometra (Leguminosae: Caesalpinioideae: Detarieae).

机构信息

Department of Biology (Ecology, Evolution, and Marine Biology), University of California, Santa Barbara, California 93106 USA; and Department of Plant Biology, Louisiana State University, Baton Rouge, Louisiana 70803 USA.

出版信息

Am J Bot. 2001 Jul;88(7):1164-80.

Abstract

Floral development was compared among several relatively unspecialized taxa in caesalpinioid tribe Detarieae: Cynometra webberi, an undescribed species of Cynometra, and three species of Schotia. These share a relatively unspecialized caesalpinioid flower type with no loss of organs, but some organ suppression. They also share the following characters: relatively small bracteoles in early stages, a circular floral apex, helical sepal initiation, and a nonmedian abaxial position of the first sepal initiated. Floral symmetry is radial. Order of initiation is helical among sepals in all. Order of petal initiation varies: helical in Schotia afra, unidirectional in Schotia brachypetala and S. latifolia, and simultaneous in Cynometra. Stamens are initiated unidirectionally in all except in the outer stamen whorl of Schotia afra, which is helical. Overlap of time of initiation between whorls occurs in S. brachypetala, S. latifolia, and Cynometra. The carpel initiates concurrently with the petals or directly thereafter in all. A tetramerous calyx results from fusion of the two upper (adaxial) sepal primordia. The carpel initiates ovules before marginal closure in both genera. Organ suppression includes one or two petals in Schotia and sometimes one in Cynometra.

摘要

比较了含羞草族几个相对非特化类群的花部发育,包括:Webber 山龙眼,一个未描述的山龙眼种,以及 Schotia 的三个种。这些种具有相对非特化的苏木型花,没有器官缺失,但有一些器官退化。它们还具有以下特征:早期小的小苞片,圆形的花顶端,螺旋状的萼片发生,以及第一枚发生的萼片背面位于近轴位置。花的对称性为辐射对称。所有种的萼片发生都是螺旋状。花瓣发生的顺序在 Schotia afra 中为螺旋状,在 Schotia brachypetala 和 S. latifolia 中为单向发生,而在 Cynometra 中为同时发生。除了 Schotia afra 的外轮雄蕊是螺旋状发生外,其余所有种的雄蕊都是单向发生。各轮之间发生的时间重叠发生在 S. brachypetala、S. latifolia 和 Cynometra 中。心皮与花瓣同时或紧随其后发生。由两个上(近轴)萼片原基融合形成四裂的花萼。在这两个属中,心皮在边缘闭合之前就开始产生胚珠。器官退化包括 Schotia 中的一个或两个花瓣,有时在 Cynometra 中也有退化。

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