濒危植物红花木莲大孢子发生和雌配子体发育的研究

研究了濒危植物红花木莲（Manglietia insignisBl)的大孢子发生和雌配子体的发育，红花木莲每朵花心皮数为48-73枚，每心皮内胚珠数4-8颗不等，多数是6颗或8颗，胚朱倒生，双珠被，厚珠心，大孢子四分体线形排列，功能大孢子位于合点端，胚囊发育为蓼型。胚珠具珠孔塞，成熟胚囊的卵细胞败育率高达79.1%。这是造成栽培红花木莲结籽率低的主要原因，较低的结籽率影响了红花木莲迁地保护的有效性。

Megasporogenesis,development of female gametophyte of Manglietia insignis(Magnoliaceae)

This paper deals with the megasporogensis,the development of female gametophyte of Manglietia insignis ,a endangered species in China.The ovule of M.insignis is anatropous,bitegmic and crassinucellate.The obturator was observed.The chalazal functional megaspore develops into a Polygonum type of embryo sac.The degeneration of egg cells was observed,and the abortion rate of ovules was about 79.1%.This was considered as a main factor responsible for the low seed set of cultivated Manglietia insignis .