1942 年 12 巻 4 号 p. 460-468
1. By treatment with 0.08% colchicine solution in 20 hours at 25°C tetraploid plants were induced in 2-5% of the treated seeds in 3 species: Linum usitatissimum, L. angustifolium and L. crepitans.
2. These tetraploid plants were of gigas types having tall stems and thick leaves. Size of pollen grains, flowers, capsules as well as seeds were also larger than those of the diploid plants. Retardation of growth in comparison with the diploids was usually observed.
3. In tetraploids the mean fertility of pollen grains was 60-70% in value, however, the number of seed set was considerably smaller amounting 2-10%, mainly because many flowers dropped down before capsules developed.
4. Chromosome behaviour was also examined. The configuration, 4IV+22II was commonly found at the 1st metaphase in L. crepitans. In anaphase, lagging chromosomes were frequently observed. Unequal distribution of chromosomes were suggested from the counting of them at the second metaphase.