花粉和资源限制对青阳参坐果率的影响

Pollen and resource limitations to fruit set of Qingyangshen(Cynanchum otophyllum)

以生长于自然种群的青阳参植株为材料进行补充授粉试验,以人工种植的青阳参植株为材料进行资源限制试验,探讨花粉和资源限制对青阳参坐果率的影响。结果表明：自花授粉、天然授粉和异株异花授粉植株的结实率分别为1.7%、2.25%和24%,花粉来源对青阳参坐果存在显著影响;补充施肥和不补充施肥植株的坐果率分别为5.12%和3.17%、去除0-80%的花其坐果率为3.28%-15.34%、叶片剪除0-100%其坐果率为3.22%-1.35%,资源限制对青阳参坐果率有显著影响。

To test the relationship of pollen limitations and resource limitations with fruit set,the experiments of pollen limitations to fruit set of Cynanchum otophyllum（Asclepiadaceae）were hand-pollinated in a wild population,while resource limitations to fruit set were performed in a cultivated population.The results were as follows：The fruit set of artificial selfing,natural pollination and artificial out-crossing were 1.7%,2.25% and 24% separately,which showed pollens from different sources had significant effect on fruit set of C.otophyllum.The fruit set of fertilized and non-fertilized plants were 5.12% and 3.17%.After removing 0-80% flowers,the fruit set increased from 3.28% to 15.34%.With the increasing percentages of cutting leaves from 0 to 100%,the fruit set decreased from 3.22% to 1.35%,which showed resource limitations had significant effect on fruit set of C.otophyllum.