イソニガナの染色体について
1956 年 69 巻 817-818 号 p. 325-328
詳細
1956 年 69 巻 817-818 号 p. 325-328
1)In this study the examinations of the mode of reproduction and the observations of the morphology of somatic chromosomes of Ixeris nipponica Nakai (Nom. Jap. Isonigana) growing in the Kashiwazaki littoral, Echigo, Japan were made.
2) It was confirmed that the mode of reproduction of the species is sexual, and not apomictic.
3) Zygotic chromosome number is 2n=14.
4) The fourteen chromosomes consist of two sets which are morphologically similar to each other. The pair of the largest chromosomes have two constrictions; one is submedian and the other subterminal, while the remaining six pairs of chromosomes have only submedian or subterminal constrictions respectively. Concerning shapes and sizes, the set of chromosemes of this species resembles the set of triploid and tetraploid species of Ixeris dentata Nakai.
