鹅掌楸雌配子体发育及淀粉动态观察

Observation of development of female gametophyte and trend of starch grain in Liriodendron chinense

鹅掌楸为双珠被、厚珠心的倒生胚珠，并具有珠心喙、承珠盘等结构。蓼型胚囊，卵器极性化不明显，二极核与精核同时融合，反足细胞退化。在胚珠与胚囊发育过程中，淀粉经合点向珠被、珠心、胚囊转移，具向心运输、积累特征，在胚囊中淀粉仅在核四周出现。本文还提供了胚珠及雌配子体内部发育阶段与外部形态的相关关系，并讨论了发育与结籽率的关系。

The development of ovule and female gametophyte in Liriodendron chinense  was observed by means of conventional methods The ovule is anatropous,consisting of bitegmy,crassinucellus, nucellar beak and hypostase The type of embryo sac belongs to the polygonum one Mature embryo sac is narrow with inflate ends The egg cell is roundish with an unobvious polaritical nucleus The two polar nuclei don’t fuse until one sperm get attached And the antipodal cells degrade During the development,the starch grains accumulate centripetally This paper offers the relationship between the development of ovule and female gametophyte and the length of the flower bud, and discusses the relationship between the development and seeding rate