鹅掌楸的传粉环境与性配置

近年来研究表明，动物传粉者对植物花部诱物特征（花冠形状大小，花蜜产量和花序大小）有潜在的选择作用。不同效率的传粉者可能导致植物性配置的变化，不同传粉效率的环境下，两性花植物鹅掌楸的花粉和胚珠的配置不同，居群Ｚ在主要访花者是传粉效率较低的类的传粉环境下，花粉粒小，花粉数量相对较高；另一方面胚珠投资的减少，缓解了低效的传粉（增大授粉的几率），增加了受精的机会。相对而言，具有高效访花者的两个居群，资源较

Pollination environment and sex allocation in Liriodendron chinense

Recent studies have demonstrated that animal pollinators have considerable potential to effect most floral traits. Here,we report different pollination effectiveness caused by various insect visitors in a hermaphrodite plant, Liriodendron chinense (Hemsl.) Sarg., can lead to changes in sex allocation measured by pollen and ovules production. In population G bees are the most abundant visitors, but flies in population H and Z. Pollen transfer by bees was much more effective than by flies. In population Z and B under the environment of lower pollen loads, plants increased pollen production, but as a result decreased pollen grains size. In the other hand, reduced the investments of ovules may expect to improve the chance of fertilization of each ovule. Since the plants in those populations had effective pollinators, resource investments largely shifted to maternal functions. Plants achieved higher reproductive success by developing more ovules, bigger pollen with larger variations. The effect of pollinators on the plant sex allocation, may be a new fied to study the evolution of hermaphroditic plants.