云烟87大小孢子形成和雌雄配子体发育观察

The Megasporogenesis and Microsporogensis of Flue-cured Tobaccovar. Yunyan87 and Its Male and Female Gametophyte Formation

采取不同发育阶段烤烟云烟87的花器官,采用常规石蜡切片法对其解剖结构进行研究。结果表明:烤烟云烟87花药壁发育类型为基本型,分化完全的花药壁由表皮、纤维层、中层和绒毡层构成,后者为腺质型绒毡层类型。小孢子母细胞减数分裂类型为同时型,四分体呈四面体型和十字交叉型,成熟花粉粒为二细胞型。烤烟云烟87的胚珠为倒生胚珠,薄珠心,胚珠多数;大孢子母细胞由孢原细胞直接生成,胚囊发育类型为蓼型。

Anatomical structure of the floral organ of Flue-cured tobacco var. Yunyan 87 at different development stage was studied by common plant paraffin section. The results showed that,the anther wall wasdefined as basis development type,which contained glandulartapetummiddle layer,endotheca and epidermis. The meiosis of microspore mother cells was the simultaneous type,the tetrad arranged as tetrahedral or decussate tetrad. The mature pollens belong to 2-cell type.The ovule of Flue-cured tobacco var. Yunyan 87 wasanatropous,thin nucellus and numerous. The megaspore mother cell was-developed from the archesporial cell and the megaspore at the chalazal end developed into the polygonum type embryosac.