摘要
本文报道小孢子发育和雄配子体形成过程中绒毡层的变化.有下列四个主要特点:1)小孢子母细胞时期,绒毡层细胞质中质体和小泡丰富,并出现前乌氏体;2)四分饱子时期,绒毡层细胞质中产生大量粗糙内质网;3)单核花粉粒时期,绒毡层细胞质中内质网消失,出现大量多泡体,并在多泡体中的小泡内沉积电子致密物;4)解体的绒毡层细胞质中含有脂体、脂滴、乌氏体、微粒体等细胞器.处于单核花粉粒时期的雄配子体,在细胞中央的细胞质中含有高尔基体、线粒体等细胞器,而在靠近细胞壁的细胞质中粗糙内质网发达,同时还有丰富的质体和线粒体.
In this paper,the development of embryo in Caragana stenophylla pojark is studied.The main results are as follows:The development of embryo sac is of the p(?)lygonum type.There is polysaccaride in the cyto- plasm of the egg cell and around the secondary nucleus.The polarity of the egg and synergid cells is obvi- ous.In the early stage of the eight-nuclear embryo sac,each cell of the egg apparatus and the central cell are seperated by complete walls.Just before fertilization,the wall bordering the egg cell and synergids in cha- lazal end disappears.After fertilization,a discontinuous new wall regenerated at the chalazal end of the zy- gote.The development of the embryo confirms to the onagrad type.The ventical and transversal divisions of the basal cell result in a multicellular suspensor.The basical suspensor cell wall adjacent to embryo sac wall and the embryo sac wall at the micropyle end all appear obviously ingrowth.The globular bodies are accumu- lated in the cytoplasm of the suspensor cell,and the density at the micropyle end is different from the cha- lazed end.There is abundant polysacearide in the integument cells at the micropyle end.After cellularization of the free nuclear endosperm,the suspensor is degenerated.
出处
《内蒙古大学学报（自然科学版）》
CAS
CSCD
1992年第2期254-257,I007,I009,共6页
Journal of Inner Mongolia University：Natural Science Edition
基金
国家自然科学基金
关键词
狭叶锦鸡儿
胚胎发育
锦鸡儿属
Caragana stenophylla pojark
development of embryo
