%0 Journal Article
%T Ultrastructure of pollen development in Beta vulgaris L.<br>栽培甜菜花粉发育过程的超微结构
%A Junping Lu
%A Jiaheng Shen
%A Dedong Guo
%A Yanjie Wang
%A <br>陆俊萍
%A 申家恒
%A 郭德栋
%A 王艳杰
%J 植物学报
%D 2009
%I 
%X The ultrastructure of pollen development in Beta vulgaris was investigated by transmission electron microscopy. Cytoplasm reorganization occurred during meiosis of microsporocytes and resulted in decreased ribosomes and regular changes of plastids and mitochondria. Telophase shows an organelle band between two nuclei. The function of the organelle band is similar to that of the cell plate that separates the cytoplasm into two parts. The tetrasporophyte wrapped by callose is of simultaneous type. Depositions of wall started at the late tetrad stage, and the exine was fundamentally completed by the late microspore stage. The monokaryotic microspore has a large nucleus and abundant organelles. Development of 2-celled pollen is accompanied by changes in the generative cell wall, which showed no plasmodesmata. Mature trinucleate pollen grains showed a vegetative cell and two sperm cells, each sperm cell separated from the vegetative cytoplasm by two continuous membranes that enclosed the cytoplasm and nucleus. Sperm was a naked cell and had a short caudal. Generative cell and sperm showed no plastids.
%K <br>栽培甜菜
%K 雄配子体发育
%K 超微结构
%K 小孢子发生
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=97AE3D0EBF25E42C466FEF50E492F710&aid=EFE34C7685D9DB61B2E18D7D427BCF18&yid=DE12191FBD62783C&vid=1AE5323881A5ECDC&iid=38B194292C032A66&sid=892C6E385D640C1E&eid=6C069F4B248105A5&journal_id=1674-3466&journal_name=植物学报&referenced_num=2&reference_num=21