抄録
(1) Fertility of the 1st generation of the colchicine induced a, utotetrahaploid chinese dabbage was very low, ahd number of seeds per one pod in the case of 'selfing, mutual 'pollihation, and open pollination were in average 2. I, 5.3 and 6.3 respectively. . (2) In the 2nd generation, 55 of 677 plants was very poor in fertility and 3. 55 6 (24) was some good of which seeds numbers per pod were 13.94. The best stock No. 32 produced 48 cc seeds and found 16 seeds in their pod. (3) The next generation (1950) of best fertile stoc.k revealed much effect of selection in fertilities a.nd 14., 4 seeds per pod were obtained in every popul-ation. (4) In the 4 th generation seeds number per pbd inreased to 15.8, and reached to economic seed productipn. (5) The placeltal numbers of pod in the 2x and 4x plants were 31.74 and 30.68 respectively and their difference was quite insigniftcant. Sb the poor fertility of 4x plants means the :dec rease of seeds grovyn' ih ppd. (6) On the observation of fertility in self and open pollination of 30 plants, seeds numbers per pod were 15. 4 and 12. 3 respectively which presented only 3. I difference in numbers, (7) Fertility in self ollination and selfing without artificial pollination were also tested and seeds numbers were 13. and 11, 3 respeqtively which difference was quite insignificant. " (8) As the fertility was prdgressed in the progeni-es, was prov, ed that self fertile ability was improyed accordingly and self incompatibility became inactive
