染色体数16および24の細胞が1個体内に混在している淡水産ナミウズムシについて

概要

論文の詳細を見る
It has been reported that Dugesia japonica Ichikawa et Kawakatsu, the common freshwater planaria of Japan, has a chromosome number of 2n=16. However, Sugino et al. (1973) found that the chromosome number of the planaria of a specific locality is not 16 but 25. This paper reports our finding that each individual of Dugesia japonica collected at the Mino River has heterogeneous cell populations with two different chromosome numbers. Thirty individuals of the planaria were collected at the Mino River, Segawa, Mino City, Osaka Prefecture, and chromosomes of a regenerating tissue of these individuals were examined with the squashing method after the colchicin treatment and orcein staining. The tissue of all the individuals contained two types of cells intermingled, one of them with the chromosome number of 16 and the other with that of 24. None of the individuals possessed the homogeneous cell population with 16 chromosomes or 24. Breeding experiments suggest that Dugesia japonica of this locality is the asexual type and this may be related to the phenomenon reported.
社団法人日本動物学会の論文
1975-03-25