Evaluation of SCN3 Resistance Phenotype of Soybean Germplasm Resources in Northeast China

In order to clarify the resistance of germplasm resources in Northeast China to Soybean Cyst Nematode Race 3, 620 soybean varieties（lines） commonly used as parents in Northeast China were used as materials. Through the field disease nursery and indoor potted inoculation identification of SCN race 3 from 2020 to 2021, the results showed that there were 30 varieties（lines） with medium resistance to SCN race 3 in the field disease nursery identification in 2020, and the disease resistant germplasm accounted for only 4.84% of the total identified germplasm. In 2021, 30 medium resistant and above materials were inoculated and identified in indoor pot. Except for Bainong 9 and Nenfeng 15, the resistance level identification of other varieties（lines） was consistent with the results of field disease nursery. Among them, 13 moderately resistant varieties such as Nongqingdou 24, Nongqingdou 28, Qinong 5 and Fengdou 1 can be directly applied in the incidence area of soybean cyst nematode, while 9 disease resistant lines such as MN0902CN, MN1701CN, Zhongpin 03-5373 and Zhongpin 03-5297 can be used as innovative disease resistant parents of germplasm resources, and other 8 moderately resistant lines can be used as compound hybrid parents to broaden the genetic basis of resistance genes. The results provided an application basis for the breeding of soybean cyst nematode resistance in Northeast China.