对甘蓝与大白菜种间杂交合成的甘蓝型油菜的研究

通过甘蓝与大白菜种间杂交获得了５０个甘蓝型油菜杂交组合。田间抗性鉴定结果：１７个组合抗寒、３８个组合耐热、４个组合抗病毒病、４２个组合抗霜霉病、３９个组合避开了菌核病。合成组合中正常可育的组合２４个，这些品系的自交不亲和性、生物学特性及抗逆性都与的它们的双亲尤其是母本甘蓝相似。正常可育的品系中１９个自交不亲和，与胞质不育则度的３个合成品系中没有找到恢复基因，但它们是理想保持系，其后代不育性彻底而稳

Studies on synthetic Brassica napus by interspecific hybridization between B. ocleracea and B. campestris

Fifty combinations of Brassica napus were synthesized by interspecific hybridization between B. oleracea and Chinese cabbage (B. campestris). The results of resistance detemination in field showed: There were 17 strains with tolerance to cold injury, 38 strains with tolerance to heat, 4 combinatons with resistance to virus, 42 strains with resistance to downy mildew , 39 combinations avoided S, sclerotiorum. In the 50 synthetic strains, there were 24 combinations with normal fertility,which self-incompatibility, morphological characters and stress resistance resembled their parents.Restorer genes from three synthetic strains were not found. The progenies of hybridization between 41A and synthetic B. napus had complete and stable sterility. A GMS line with 100% sterile rate and 100% sterile degree was also obtained from the reciprocal crosses between the synthetic B. napus and double low lines. The morphological characters of the reciprocal cross hybrids appeared intermediate of their parents. Only three hybrids were resistant to cold. But most of them were late maturity, resistant to heat, virus disease, downy mildew and avoided S. sclerotiorum. Thir weight of 1000 seeds and oil content were much higher than present B. napus cultivars.