Breeding and Utilization of An American Hybrid Breeding Line 1064

In order to promote the renewal of maize breeding materials,this research group uses the American hybrid Xianyu 335 as the germplasm basis,and uses encrypted screening,artificial inoculation identification,natural selection,and artificialselfing to select 7 generations that have strong disease resistance,resistance to infertility,fast dehydration,and adaptability.By dividing the blood relationship,the blood relationship of 1064 was clarified,and the heterosis among different blood relationships was used to successfully breed new maize varieties Nendan 27,Nendan 29,and Nendan 35.The active accumulated temperature ≥10 ℃ required for the growth period of the three varieties was 2 550-2 700℃,which is suitable for the combination of excellent maize varieties in the first to the third accumulated temperature zone of Heilongjiang Province.