阔叶杨桐的花器官发生(山茶科)

Early floral development of Adinandra latifolia (Theaceae)

关键词:  山茶科  厚皮香亚科  杨桐属  花器官发生

Key words:  Theaceae  Ternstroemioideae  Adinandra  floral ontogeny

摘要:

利用扫描电镜首次观察了山茶科厚皮香亚科植物阔叶杨桐的花器官发生过程。阔叶杨桐的花被片和五束雄蕊都是2/5螺旋向心发生,且有逆时针和顺时针两种螺旋方式; 五束雄蕊在环形雄蕊原基上产生,且每一束都是由中间向两端发生; 由五心皮形成的中轴胎座内出现一衍生的可育胎座。阔叶杨桐的花器官发生过程与本亚科的猪血木明显不同,该研究为厚皮香亚科乃至山茶科的系统发育与演化提供花器官方面的依据。

Abstract:

The floral development of the plant in Theaceae, Adinandra latifolia H.T.Chang has been observed under scanning electron microscope(SEM)for the first time up to date. Both perianth and 5 clusters of stamens are initiated 2/5 spirally and centripetally and in the same order either clockwise or anticlockwise in the same flower; 5 clusters of stamen primordia are initiated directly on the ring-like primordium and each cluster of stamens is initiated from middle to two ends; under the axile-central placenta formed by five carpels,there is a deuterogenic fertile placenta initiated directly at the base of the same ovary. The floral development of A.latifolia is distinctly different from Euryodendron excelsum in Ternstroemioideae,so the present work provides evidence from floral organogenesis about the further study on the phylogeny of subfamily Ternstroemioideae even of Theaceae.