五唇兰雌配子体发育和胚胎发生的研究

五唇兰的胚珠倒生型，具薄珠心，两层珠被。胚囊发育为双孢子葱型，成熟胚囊８核。从传粉到受精约５０ｄ，正常双受精。胚具５－６细胞的胚柄，种子成熟时胚柄及胚乳核消失，成熟种子只具单层细胞的种皮和一个未分化的珠珠形胚。

THE STUDIES OF THE FEMALE GAMETOPHYTE DEVELOPMENT AND THE EMBRYOGENESIS IN DORITIS PULCHERRIMA LINDL.

The female gametophyte development and process of embryogenesis in DoritisPulcherrima Lindl. were observed. The results indicate that the ovule is of anatropous formWith 2 integuments and one layered nucellus epidetris around the megaspore mother cell,the mature embryo sac consists of 8 cuclei and its formation is conformed to the Alliumtype. The interval between pollination and fertilization is about 50 days, and the normaldouble fertilization has been observed. During the development of the embryo, thesuspensor is composed of 5-6 cells. However, the endosperm nuclei and suspensor are alldegenerated in mature seeds. The embryo in mature seeds is just an undifferentiatedglobular mass with 100-120 cells and the seed coat having only one4ayer cells.