杂种优势群的划分对杂交种选配 ,玉米自交系的选育具有重要意义。特别是新引入的优良自交系 ,只要能掌握其优势利用模式 ,不仅可以推断它所属遗传类群 ,也为其进一步利用配制优良组合或做为选系种质提供了依据。“南方玉米育种开发中心”成立时 ,就面临两个技术难题 ,一是温带 The division of heterotic groups is of great significance to the selection of hybrids and the breeding of maize inbred lines. In particular, the newly introduced elite inbred lines, as long as they can grasp the advantages of utilization patterns, not only can infer that it belongs to genetic groups, but also for its further use to prepare a good combination or as a germplasm of germplasm resources. “Southern Corn Breeding and Development Center” was established, it faces two technical problems, one is temperate