青檀花粉生殖细胞的形成和质体遗传格式

利用电子显微镜和荧光显微技术研究了青檀花粉生殖细胞的形成过程及壁的成份.小孢子刚从四分体中释放时,核位于中央,细胞器随机分布.当小孢子核移向边缘时,细胞器特别是质体,呈不均等分布,在核的对面聚集.刚形成的生殖细胞完全被细胞壁包围着,壁的成份是纤维素和胼胝质.生殖细胞形成后不久,胼胝质即消失,而纤维素则部分地保留,一直到游离生殖细胞早期.传粉时的生殖细胞呈蝌蚪状.在生殖细胞中始终没有发现质体.故青檀的质体遗传格式属于番茄型.

THE FORMATION OF THE GENERATIVE CELL AND THE TYPE OF PLASTID INHERITANCE IN PTEROCEITIS TATARINOWII MAXIM

The young microspore of Pteroceltis tatarinowii Maxim. contains a nucleus lo-cated in the center of the cell and cell organelles appear to be randomly distributed. When the nucleus of the microspore takes a position near the cell wall, the plastids are located at the oppsite side of the cell. Here they are aggregated and started to accumulate starch. Distinguished by the fluorescence properties, the wall between generative cell and vegetative cell contains both of callose and cellulose. When the generative cell starts to detach from the pollen wall, the callose disappears but fine fibrillar material can also be observed by electron microscope until the generative cellmoves to the vicinity of the vegetative nucleus. The unequal distribution of plastidsin the developing microspore of pteroceltis leads to exclusion of plastids from thegenerative cell. Therefore, according to the criteria of Hagemann, this genus belongs to the Lycopersicon-type with respect to plastid inheritance. Some unusual phenomena in the developing generative cell are also reported in this paper