新疆蒲公英属有性生殖与无融合生殖植物的调查研究

A SEARCH FOR SEXUAL AND AGAMOSPERMOUS TARAXACUM SPECIES IN XINJIANG

以新疆22种蒲公英的186价腊叶标本为材料，观察统计了每份标本的花粉败育率、花粉位大小变异的标准方差。标准方差小于3、败育率小于20％的花粉PR变异型，是有性生殖植物的特征；标准方差大于3、败育率大于40％的花粉PS变异型，是无融合或兼性无融合植物的特征；不产生花粉的PA变异型，则是雄性不育植物的特征。在所观察的标本中，有4科蒲公英植物出现了有住生殖个体，其余为无融合或兼性无融合类。此外，还就蒲公英繁育方式与分种问题作了初步探讨。

In this papert the variation of pollen grains from 186 herbarium specimens ofTaraxacum in Xinjiang is classified as following:The specimen that exhibit PR,PS or PA pollen type is of sexual diploid,apomicticpolyploid or male sterile plant. There are some diploid sexual individuals in T. bessaralecum, T. bicone, T. kok-saghyz and T. lilacinum. The taxonomical problem of Taraxacum is also discussed in this paper.