中国玉米连年丰收,国内市场供应充足,但未来玉米需求会继续扩大,对玉米生产和育种研究提出了新的挑战。回顾历史,中国玉米品种不断提高产量,得益于增强了抗逆(病)性。但在90年代以后,玉米育种目标和育种思路受到困扰。育种者要重视提高品种的抗逆性,通过循环育种和高密度抗逆育种途径培育配合力更高的优良自交系和抗逆性更强的杂交种

Domestic demand for maize will increase although the maize supply is plenty enough currently.This is a big challenge to the national maize R & D system,especially for maize breeding programs.Yield gains have been being increased since the introduction and adoption of hybrids,the stress tolerance of modern hybrids has been enhanced during the last 5 decades.Maize breeding efforts were driven by production management of low population density,which caused declines in breeding targets and strategy.Breeding efforts for stress tolerance should be emphasized,and cycling breeding strategy and selection under high population density should be adopted to develop elite inbred and hybrids.