滇产17种石斛的种子形态

Seed morphology of 17 Dendrobium species from Yunnan

目的:揭示滇产石斛的种子形态,为分类和鉴定提供依据。方法:应用光学显微镜和环境扫描电镜观察滇产石斛的种子形态。结果:滇产石斛种子在色泽和形状上比较相似,均为黄色和不规则的纺锤体形,但在种子和胚的大小上存在显著的差异,这些差异与属下分组无明显相关性。石斛种子由种皮和胚2部分组成,种皮细胞的细胞壁上有絮状物,絮状物的疏密和长短在组间有差异。结论:报道了17种滇产石斛的种子形态,其中有16种石斛的种子形态属首次报道。

Seed morphology of 17 Dendrobium species from Yunnan were observed under light microscope and environment scanning electron microscope and 16 of them were reported first time.All seeds were yellow and fusiform,but big differences existed in sizes of seeds and embryos,which were not significantly related to the division of sections under Dendrobium.Dendrobium seed consisted of embryo and testa with flocs on its cell walls.The density and length of flocs were different among the sections under Dendrobium.