大血藤生殖生物学研究

Reproductive Biology of Sargentodoxa cuneata(Sargentodoxaceae)

通过野外观测、实验室分析以及人工套袋授粉等方法，研究了大血藤的繁育系统、开花习性、传粉方式以及花粉-胚珠比等生殖生物学特征。结果表明，大血藤的花为单性花，雌雄同株。雄花单花花期为7～10d，雌花单花花期为2～3d，种群开花历时14～17d，散粉高峰期为4月11～17日，属风媒传粉植物。大血藤花粉一胚珠比为600±20，属兼性异交类型，人工套袋实验进一步证明，大血藤的交配系统为兼性异交类型，但以异交为主。

The floral biology and breeding system of Sargentodoxa cuneata （Oliv.） Rehd. et Wils. was studied by investigating flowering phenotype in the field,pollen-ovule ratio and cross-pollination. S. cuneata is monoecious. The anthesis of single male flower and female one lasts 7-10 d and 2-3 d,respectively. The period of anthesis of the flowers in populations is 14-17 d. The peak phase of shedding pollens is from April llth to 17th. The value of pollen-ovule ratio is 600±20. S. cuneata is anemophilous,the artificial pollination indicated that the mating system of S. cuneata is facultative xenogamy, but predominantly outcrossed.