第一讲种质资源及其利用丰富的种质资源是棉花育种的物质基础。现在世界各主要植棉国家都面临着棉花种质资源贫乏的问题。现今美国陆地棉品种仅来自17个基础种质。其中在世界范围内种植的4个主要类型中,珂字棉、斯字棉和岱字棉都是来自同一个祖先,只有爱字棉是来自另一个祖先。我国育成的陆地棉品种其种质资源更窄。根据周盛汉等列举的664个陆地棉品种(系)中,就有近300个是直接或 Lecture 1 Germplasm resources and their use of rich germplasm resources are the material basis for cotton breeding. Now the world’s major cotton-growing countries are facing the problem of cotton germplasm is poor. Today, the United States upland cotton varieties from only 17 basic germplasm. Among the four main types of plantings worldwide, the Cox, the Sims and the Dai cotton come from the same ancestor, and only the cotton from the other word comes from another ancestor. The varieties of upland cotton cultivated in China have narrower germplasm resources. According to Zhou Shenghan and other cited 664 land cotton varieties (lines), there are nearly 300 direct or