我国选育自交系间杂交种的工怍,十几年来进展较快。各省(市)都选育了一批优良杂交种,广泛应用于生产,增产显著,推动了我国玉米生产的发展。目前,国内外玉米育种工作者普遍感到:利用现有的品种资源,选育更优良的自交系,日益困难。随着研究的深入,改良和提高品种群体的工作日益受到重视,这是一项带根本性的战略措施。目前各国都在逐 The breeding of hybrids among inbred lines in China has progressed rapidly in recent ten years. All provinces (cities) have bred a group of excellent hybrids, which are widely used in production and yield increase significantly, which has promoted the development of corn production in China. At present, corn breeders at home and abroad generally feel that it is increasingly difficult to utilize the existing variety resources to breed better inbred lines. With the deepening of research, the work of improving and enhancing the breed groups has drawn increasing attention. This is a fundamental strategic measure. At present, all countries are on the move