药用植物地黄的传粉效率与结实率研究

Pollination Efficiency and Setting Rate in Rehmannia glutinosa

药用植物地黄 (Rehmanniaglutinosa (Gaertn)Libosch)在自然授粉中结实率约为1 3%。其花柱的授粉率较高 ,达 72 .2 % ,为结实率的 5.55倍。花柱头上的平均花粉量为 5～1 8个 ,但主要为来自自花的花粉。从不同处理下结实率实验看 ,地黄的有性繁殖主要依靠异花授粉 ,其自花授粉的结实率为 1 .1 %。因此可以认为 ,在影响结实率的诸多因素中 ,异花授粉的效率以及植物对异花授粉的依赖程度是重要因素。

The pollination biology of Rehmannia glutinosa was studied.Its setting rate was 13% under natural conditions;the pollination rates were high up to 72.2%, 5.55 times its setting rate. The mean number of pollen grains per stigma ranged from 5 to 18, most of which were from self-pollination. The sexual reproduction of Rehmannia glutinosa was dominantly xenogamous, while the setting rate of autogamy was about 1.1%. It was believed that the efficiency of and dependence on xenogamy were important factors among those influencing setting rate.