Summer Maize Breeding in China: the Priorities and Strategies
The major constraints for summer maize production in China are the short crop season, hurricanes, severe biotic and abiotic stresses, all of which reduce yield under summer maize conditions. The yield potential for summer maize hybrids in farmers fields should reach 12t/ha. Elite hybrids should be early in maturity, resistant to diseases, tolerant to drought stress and lodging resistant at a planting density of 75000plants/ha. The yield potential of the inbred lines per se should reach 6t/ha and 9t/ha, respectively, in the summer and spring maize regions. For summer maize breeding, the three dominant heterotic groups are Reid, Sipingtou and PB. The top three heterotic combinations are Reid×Sipingtou, PB×Reid, and PB×Sipingtou. The best strategy of inbred lines development, is to enhance the selection pressure by increasing population density (to over 100000plants/ha) in the nursery, and to especially focus on lodging resistance. Germplasm improvement, should involve important germplasms such as Sipingtou (representative line, Huangzao 4), Reid (Ye478), PB (Qi319), and their relatives. The other two major heterotic groups namely Lancaster and Luda Red Cob used in spring maize breeding programs are susceptible to diseases in the summer maize area, and it is better to intro-duce exotic germplasm to improve the domestic populations.
Summer maize Heterotic groups Breeding strategies
Liming Wang Qingfa Guo Zhaodong Meng Zhijing Han Xinxue Gao Zhixian Liu Xiaoqing Zhang
Shandong Academy of Agricultural Sciences, Jinan 250100, Shandong, P. R. China
国际会议
第九届亚洲玉米大会(the Ninth Asian Regional Maize Workshop)
北京
英文
21-24
2005-09-05（万方平台首次上网日期，不代表论文的发表时间）