摘要
用常规石蜡切片法和显微镜观察,对桐花树的胚胎发育早期进行研究,得到以下结果:1)花药由4个花粉囊组成,药壁包括表皮、药室内壁、中层及绒毡层,绒毡层为腺质绒毡层;2)小孢子母细胞减数分裂为同时型,四分体排列方式为四面体型;3)成熟花粉二细胞,有4个萌发孔;4)特立中央胎座,薄珠心,大孢子母细胞减数分裂形成T形排列的4个大孢子,合点端的大孢子具功能,成熟胚囊为七胞八核结构,胚囊发育类型为蓼型;5)花药壁中含单宁细胞团,发育过程中子房内的胎座出现类似于盐腺的结构.
Viviparity is the distinct characteristic of some mangrove plants. Most researches focus on its physiology and ecology, but little is known on the early development stage of the embryo. In this paper,the sporogenesis and the development of female and male gamepothytes in Aegiceras corniculatum were studied by the means of paraffin-embed and microscope obesrvation. The results show that; （1） the wall of anther consists of four layers：epidermis, endothecium, middlelayers and tapetum from out to inside, and ta- petum cell was secretory type; （2） cytokinesis of microsporocyte meiotic division was simultaneous type, and tetrasporophyte was tetrahedral; （3） mature pollen grain was 2-cell type,and contained four germ pores; （4） the ovule was double integuments, tenuinucellate, and megasporocyte divides into four T-type-allied megaspores by meiotic division. The megaspore near chalazae was the functional one. Embryo sac was Polygonum type. （5） there were groups of tannin-cell in the wall of anther,and secretory structures like the salt gland in the ovarys, showing that mangrove plants have developed some special systems in the reproduce apparatus to adapt themselve to the salt habitat.
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
2005年第5期718-722,共5页
Journal of Xiamen University：Natural Science
关键词
桐花树
大孢子发生
小孢子发生
雌配子体
雄配子体
Aegiceras corniculatum
megaspore microspOre
male gametophyte
female gametophyte
