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)

关键词:  青阳参  坐果率  花粉限制  资源限制  补充授粉

Key words:  Cynanchum otophyllum  fruit set  pollen limitation  resource limitation  hand pollinated

摘要:

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。

Abstract:

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.