小桐子开花生物学习性

Floral biology of Jatropha curcus

选择云南南部4个试验点,对不同光照及不同空间小桐子的开花习性、花序数量、雌雄比例与结实率进行观察。结果表明:小桐子在云南南部地区的单花花期2-3 d,一个花序花期10-25 d,一个居群的花期可长达半年。一般雄花比雌花晚开放2-3 d,但在同一个花序盛花时,雌花和雄花同时开放,不存在雄花与雌花花期不遇的情况,并认为雄花与雌花的空间隔离,加上传粉昆虫(蜂类、蝶类、蝇类)活动范围与活动频率较大,才是促进小桐子异交授粉的主要因素。在不同地域、不同光照条件及不同空间的花序数量、雌雄比例、结实率都存在明显的差异,说明小桐子是一种极向阳的植物,栽培时应尽量选择光照充足的土地,并进行适当修剪,促进分枝和顶生花序的数量、雌雄比例与结实率,提高种子产量。

The floral biology,numbers of inflorescence,ratios of female flower and ratios of seed in different zone,different light supply and different space of Jatropha curcus were studied in this paper.The results showed that the individual flower lasted 2-3 d,the inflorescence flowering lasted 10-25 d,and the florescence of a population could be more than six months in the south Yunnan,China.The flower opened at around 8:00 and closed at around 19:00 everyday,and it could re-open on the next morning.The open date ...