人工授粉对濒危植物长柄双花木结果率和结籽率的影响

花粉和资源有效性是影响有花植物生殖成功的关键因素。本研究探讨了人工授粉对濒危植物长柄双花木雌性生殖模式,尤其是对其结果率、结籽率以及果实和种子重量的影响。研究结果表明:异花授粉提高了长柄双花木的结果率和结籽率,且前期花的结果率、结籽率均显著高于后期花的;而自花授粉不但显著降低了其结果率和结籽率,同时在前期和后期花的结果率、结籽率之间均无显著差异。异花授粉显著提高了单株植物种子重量及单果种子重量,而自花授粉则显著降低了它们的重量。异花授粉后前期花的果实重量及单果种子重量均显著高于后期花的。同时,异花人工授粉后种子数量和单粒种子重量之间存在权衡,而自然授粉条件下则不存在这种权衡。

EFFECTS OF HAND POLLINATION ON FRUIT AND SEED SET IN THE ENDANGERED PLANT DISANTHUS CERCIDIFOLIUS VAR.LONGIPES

Pollen and resource availability are main factors that affect the reproductive success of flowering plants.Hand pollination experiment was conducted to investigate the patterns of female reproduction in the endangered plant Disanthus cercidifolius Maxim.var.longipes H.T.Chang（Hamamelidaceae）.The results showed across-pollination induced significant differences between early-blooming flowers and late-blooming flowers so far as fruit-set and seed-set per plant concerned,and significantly increased the seed weight per plant and per fruit respectively.But self-pollination significantly decreased the fruit-set and seed-set.A trade-off between the number of seeds and weight per seed exists under hand-pollination but not under nature pollination.