Studies on the Cytology of Two Species of Phymatodes
1961 年 26 巻 3-4 号 p. 460-467
詳細
1961 年 26 巻 3-4 号 p. 460-467
The morphology of the somatic chromosomes and meiotic behaviour of chromosomes in Phymatodes scolopendria (Burm.) Ching and P. nigrescens (Bl.) J. Sm. is described. In both species the chromosome number is n=36 and 2n=72. The somatic chromosomes are characterised by the predominant occurrence of subterminal centromeres. The ratio of length of the shortest and longest chromosomes in both species is about 1: 2.2. The length of the chromosomes ranges from 2.9-6.5μ in P. scolopendria and 2.4-5.2μ in P. nigrescens.
Meiosis is fairly regular in both species. In P. nigrescens the tetrad nuclei, in some of the sporangia, fuse together to form large tetraploid nuclei which immediately undergo ‘secondary meiotic’ division and show much irregularity in this division.
The authors wish to convey their sincere thanks to Dr. I. Banerji for his kind interest in this work.
