坛紫菜幼苗无性繁殖的再研究

RE-EXAMINATION ON THE ASEXUAL REPRODUCTION OF YOUNG BUDS OF PORPHYRA HAITANENSIS

坛紫菜（Porphyrahaitanensis）幼苗能否形成单孢子是我国多年来悬而未决的理论问题。本文对这一问题进行了反复、多方面的研究，特别是对于幼苗释放细胞的条件，细胞的发育分化趋势及超微结构作了重点研究，并将研究结果与真正放散单孢子的条斑紫菜（P．yezoensis）作了比较，发现在一定条件下坛紫菜幼苗能释放一种以前曾被认为是单孢子的细胞，它们的光学及超微结构、释放规律和发育趋势与坛紫菜酶解的营养细胞相同，而与条斑紫菜单孢子有明显差异。试验结果证明坛紫菜幼苗阶段不能产生单孢子。

It has been discussed for many years in China whether the young buds of Porphyra haitanensis can release monospores. The problem was studied in many aspects, especially for the condition of cells releasing, for the tendency of cells development and differentiation, and for the ultrastructure.After a comparison between P. haitanensis and P. yezoensis, the young buds of P. haitanensis were found releasing some cells under special culture conditions,which had been regarded as monospores. However, they are the same as vegetative cells of P. haitanensis and different from the monospores of P.yezoensis in the microstructure, ultrastructure, releasing rules and the developmental results of cells. The above results of experiments indicate that the buds of P. haitanensis can not release the real monospores.