种质资源是良种选育的物质基础。所谓良种,是指在某一生产水平阶段相对比较好的种质。现今的良种随着生产水平的提高很可能因不适应生产的需要而变成“劣种”。必须不断地改良品种,而种质资源的保存,就是保证了进行改良品种的物质基础。作为育种工作者必须充分注意栽培植物的野生或半野生的亲缘种,虽则这些野生种质与目前的栽培种(品种)相比,在栽培性状,特别是丰产性状方面不免相形见绌。但在它们的遗传多样性,尤其是抗 Germplasm resources are the material basis for seed selection. The so-called seed, refers to the stage of a certain level of production is relatively good germplasm. With the improvement of production level, current varieties are likely to become “inferior” because they do not meet the needs of production. The breeds must be constantly improved, while the preservation of germplasm resources is the material basis for improved breeds. As breeding workers, adequate attention must be given to the wild or semi-wild relatives of cultivated plants, although these wild germs, compared with the current cultivars (cultivars), can not be overshadowed by the cultivated traits, especially the high yield traits. But in their genetic diversity, especially resistance