中国槲寄生属花粉形态的研究

首次系统地报道中国槲寄生属10种植物花粉形态。通过光学显微镜和扫描电镜观察,国产槲寄生属种类可按花粉的外壁纹饰分为两大类群,与形态上划分相一致。类群Ⅰ(8种)具不显著或近光滑的外壁纹饰,这一类型又可分为2个亚型:纹饰在花粉各个部位基本上是一致的和纹饰在赤道和极、沟两侧不一致的;类群Ⅱ(2种)外壁具显著的杆状纹饰。但花粉性状对形态上相近的种类鉴定意义不大。还讨论了槲寄生属花粉的可能的演化趋势。

Pollen morphology of Viscum in China

Pollen grains of 10 species of Viscum L. in China were examined under LM and SEM. Based on ornamentation characteristics observed, the Chinese species of the genus might be divided into two groups, which are correlated with differences in morphology:Group Ⅰ(8 species)characterized by psilate and slightly sculptured exines;and Group Ⅱ (2 species)characterized by possessing highly sculptured(echinate,rodlet)surfaces. Species within Group Ⅰ could be further divided into two subgroups by pollen characters;Those with exine sculpture basically uniform in all portions of the grain and those with sculpture different in polar and equatorial areas. Similar species in exomorphology are palynologically almost indistinguishable.