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Breeding for Disease and Stress Resistance by use of Exotic Maize Germplasm

Wang Liansheng, Li Qiusheng , Kong Lingxiao, Ji Lijing (Institute of Plant Protection; Hebei Academy of Agricultural and Forestry Sciences, Baoding 071000)  
In order to improve the narrow germplasm base in Chinese germplasms and shortage of fine germplasm resources in maize breeding of China and breed out new self-bred lines with higher disease resistance and stress resistance. 500 maize germplasms were imported for broadening genetic diversity in maize breeding and improving the disaese and stress resistance. Their resistance for different diseases were evaluated in field trials. There were 25, 10, 2, 1, 2 germplasms showed high resistance to rust disease, Northern leaf blight, ear rot, Southern leaf blight and maize grey leaf spot respectively. Five germplasms with early maturity character were identified. 8 germplasms have been tagged with different resistant genes to Northern leaf blight and twenty-five germplasm been tagged with different resistant genes to rust diseas. 35 self-bred lines with disease and stress resistance were developed and a new cultivar Zhi 9831 with early maturity character was released by crossing with the Chinese main inbreds, disease and stress resistance evaluation and backcrossed.
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