考察结果表明 ,主要推广品种本身均具有广泛的基因容量和遗传背景 ,如亲本选配妥当 ,能在一定时期内抵抗不同的不良生存环境且能在较广的生态区域内种植 ,具有较好的适应性。但主导品种仍属于近亲种植 ,遗传基础相当狭窄 ,应重视种质资源研究和中间材料的选育工作 The results showed that the main varieties to promote their own wide range of genetic capacity and genetic background, such as the proper selection of parents, in a certain period of resistance to different adverse living environment and can be planted in a wider ecological area, with better Adaptability. However, the dominant species still belong to the inbreds, and the genetic basis is rather narrow. The research on germplasm resources and breeding of intermediate materials should be emphasized