1早期玉米育种近代玉米育种起始于20世纪初叶,1900年以前的玉米育种主要停留在农家品种的改良上,还没有适合大规模生产、机械化作业的玉米品种。且农家品种几乎均为开放授粉群体,群体杂合,表型不一致,不利于高产。 A. Early Maize Breeding Modern maize breeding started in the early 20th century. Prior to 1900, maize breeding had mainly stayed on the improvement of peasant breeds. There was no maize variety suitable for large-scale production and mechanization. And almost all varieties of farm families are open pollination groups, heterozygous groups, phenotypic inconsistencies, is not conducive to high yield.