Cytological Studies on Porphyra yezoensis UEDA

概要

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In recent years, morphological details of the life-cycle of Porphyra had been presented by many investigators. However, the cytological evidence of Porphyra at various stages of the life-cycle had not been cleary established, especially that of Conchocelis-thalli is entirely obscure. In this paper, the author deals with the cytology of P. yezoensis UEDA by means of Godward's iron-alum acetocarmine squash technique. The results obtained are summarized as follows: At the nuclear division of vegetative and spermatangial cells in leafy thalli of P. yezoensis, three chromosomes were counted. Monespores from young leafy thalli and conchospores from Conchocelis-thalli also have three chromosomes each at their germination. On the other hand, in fertilized carpogonia and Conchocelis filaments, the nuclei have six chromosomes as diploid. The meiosis of this alga seems to take place at the time of conchospore-formation in the mature conchosporangium.
長崎大学水産学部の論文
1967-12-00