Study on Soybean Breeding for Resistance to Cyst Nematode

Studies on breeding for resistance to cyst nematode has been carried out since 1991. It was found that the dominant race of cyst nematode was race 4 in nearby Beijing area. A lage crosses and more than 50 combinations were made. The best combination is Dan 8×PI 437654 with big segregation in plant height, pod bearing habit, resistance to cyst nematode, maturity, and large amount of soybean new lines, highly resistant to cyst nematode through pedigree method of selection, enlarge the number of plants of good combination, alternate breeding in North and on South, identification at early generation were obtained. Now three soybean cultivars, Zhonghuang 12, Zhonghuang 13 and Zhonghuang 17, with moderate resistance to cyst nematode in Beijing, Anhui, Tianjin and North China were released, and a lot of lines that highly resistant to cyst nematode were obtained.