华南云实传粉生态学

在广东鼎湖山,华南云实(Laesalpinia crista L.)始花期从2月或3月开始,开花后约1周达到盛花期,盛花期持续2～4 d,花期可持续到4月底.华南云实基本繁育系统为雌蕊先熟、自交不亲和的异花受精.华南云实传粉方式为风虫媒.其主要传粉者为膜翅目昆虫,该种是云实属植物中首次报道的可行风媒传粉的种类.描述并探讨了华南云实花的结构与其主要传粉者木蜂之间的互动适应,并讨论了传粉生物学实验中的一些处理方法对华南云实开花过程的影响.

Pollination Ecology of Caesalpinia crista (Leguminosae:Caesalpinioideae)

The flowering phenology, pollination ecology and breeding system of Caesalpinia crista L. were studied in Dinghushan Nature Reserve, Guangdong, China. The species started blooming in February or March, then last till late April. It took about one week from first flower appearance to its full blooming, which lasted for 2-4 d. The pollen-ovule ratio was 18 000±500. The breeding system was self-incompatible, and protogynous xenogamy. Hymenoptera constituted the major group of pollinators. The pollination type is ambophily, the species could be pollinated by wind if the pollinators were unavailable: this is the first record of ambophily in the genus Caesalpinia. The floral structure adaptation to the pollinating behavior of carpenter bees was described. The influences of artificial treatments in pollination biological studies on the flowering and fruiting of the plants were also discussed.