中文摘要：

本文探索鸡蛋花开花不结实的原因。通过对鸡蛋花雌、雄性器官的切片观察和离体花粉萌发,发现其花粉和胚囊均正常,离体花粉可萌发花粉管;但鸡蛋花的花筒长约1 cm,花筒基部湿度较高;开花时,雌蕊柱头和雄蕊花药均不能伸出花筒,花药不能开裂释放花粉,产生了传粉障碍,最终导致不育。

英文摘要：

The plant of Plumeria rubra blooms but has no seeds.The study on this species was conducted to discover the cause of its sterility.The development of embryo sac and pollen were both normal using section observation on female and male organ and pollen germination in vitro,and pollen in vitro could germinate pollen tubes.The cylinder of corolla is about 1cm length,and its basal has high humidity.When blooming,the pistil stigma and anthers can not elongate out the cylinder.Therefore,the anthers staying inside humid cylinder can not dehisce and release pollen,which makes obstacle for pollination,and finally causes sterility.