检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
作 者:李翌[1] 杭悦宇[2] 王庆亚[1] 吴宝成[2] 王筱璐[2] 赵亚美[2]
机构地区:[1]南京农业大学生命科学院,南京210095 [2]江苏省·中科院植物研究所,南京210014
出 处:《广西植物》2008年第2期167-172,200,共7页Guihaia
基 金:国家自然科学基金(30270108)~~
摘 要:通过田间观察与石蜡切片法,对粉背薯蓣雄花的发生发育进行了形态与解剖学观察。结果表明:粉背薯蓣雄花为功能上的单性花,花芽分化时雄蕊原基正常启动,随后,3枚雄蕊正常发育,3枚雄蕊退化。成熟雄蕊药隔分叉、变宽呈加厚短叉状,退化雄蕊呈花丝状,顶端分叉或膨大成瘤状。初步分析了花部构件的演变与功能的关系。对粉背薯蓣小孢子发生及雄配子体发育过程的观察表明,花药具4个花粉囊,花药壁发育为单子叶型,由表皮、药室内壁、中层1层和绒毡层组成,绒毡层为腺质型。小孢子母细胞减数分裂后胞质分裂为同时型,四分体为四面体型排列,偶有左右对称型排列,成熟的花粉粒为二细胞型。The morphological anatomy on development of staminate flowers in Dioscorea collettii var. hypoglauca was first systematically researched by means of normal paraffin embedded sectioning and observation in field. The results showed that the floral organ were imperfect. The staminate connective were forky and thicken, however,the staminodia presented filamentous with a forky or strumose apex. The evolutionary trend of flowers was discussed in this paper. The anther in D. collettii var. hypoglauca was tetrasporangiate. The anther wall was monocotyledonous type in the development, which comprised epidermis, fibrous endothecium, middle layer and glandular tapetum. The microspore mother cells underwent meiosis,and the cytokinesis was simultaneous. The tetrads were tetrahedral. Mature pollen grains were two-celled at the dispersal stage.
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.70