玉簪属花药结构和花粉发育

The Anther Structure and Pollen Ontogeny in Hosta Tratt

利用石蜡切片技术研究了玉簪属植物花药结构和花粉发育,其观察结果表明：玉簪成熟花药由表层、药室内壁、中层和绒毡层等4层细胞组成;4个小孢子囊呈线形排列,并着生于药隔的向心面;小孢子母细胞分裂属连续型;成熟花粉为3-细胞结构,营养细胞充满大量淀粉粒;花药发育存在严重败育现象,花粉个体发育也具明显的不同步性;横切面观,玉簪花被片具有9-13个痕迹;2n=2x=60.从上述资料看,作者支持把＂玉簪属＂植物提升到＂玉簪科＂的水平.

The anther＇ s structure and pollen ontogeny in Hosta Tmtt. containning 6 species and 4 related taxas were studied by light microscopy. The results are as follows： （1） The mature anther wall consists of 1 epiderm, 1 endothecitan, 1 middle cell,and 1 tapettan. （2） The four microsporangia arranges in linear mode and occur on the introrse side. （3） The male-gametogenesis is non-homogeneous. （4） The mature pollen is 3-cellular and the vegetative cell is filled with a large number of starch grains. （5） 2n = 2x = 60. （6） About 9 - 13 traces were often seen in the tepals in transection. Consequently, the authors agree with the view of Takhtajan （1997） and Wu et al. （2003） and elevate the Genus Hosta Tratt. to level of the Family Hostaceae.