蔓长春花大、小孢子形成和雌、雄配子体发育观察

The Megasporogenesis and Microsporogensis of Vinca major and Male and Female Gametophyte Formation

采用常规植物石蜡切片法对蔓长春花(Vinca major L.)不同发育阶段花器官实施解剖结构研究,结果表明,蔓长春花花药壁发育属于基本类型,其由表皮、药室内壁、中层和腺质型绒毡层组成。小孢子母细胞减数分裂为同时型,四分体排列成四面体型,成熟花粉是2-细胞型。其胚珠是直生胚珠、双珠被、厚珠心型,次生造孢细胞发育成大孢子母细胞。大孢子母细胞减数分裂形成三分体,合点端的大孢子发育为胚囊,胚囊为蓼型。

The anatomical structure of the floral organ of Vinca major L.at different development stage was studied by common plant paraffin section.The results showed that the development of V.major flower periwinkle belonged to the basic type,which contained epidermis,endotheca,middle layer,and glandular tapetum.The meiosis of microspore mother cells was the simultaneous type,the tetrad arranged as tetrahedral;while mature pollen was 2-cell type.The ovule was orthotropous ovule,double integuments,thick megarchidium type;and the megasporocyte was developed from secondary sporogenous cell.Megasporocyte developed into triad through meiosis.The megaspore at the chalazal end developed into the Polygonum type embryo sac.