种质资源是作物育种的物质基础,当前我国玉米育种的要害是缺乏新的优良种质,广泛引进低纬度玉米,可能是一条有效途径。玉米原产美洲热带地区,那里也是玉米的多样性中心,种质异常丰富。由于光周期 Germplasm resources are the material basis of crop breeding. At present, the key point of maize breeding in China is the lack of new excellent germplasm. The introduction of low latitude maize may be an effective way. Native to the tropics of the Americas, where corn is also a center of diversity of corn, the germplasm is exceptionally rich. Due to photoperiod