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遗传组成上的差异是作物品种改良的先决条件.一个最易被接受且在短期内可能被结合的变异源,是通过其他改良过的和适应性好的品种再经过当地同一种作物而形成的.当这些变异枯竭无法满足育种要求时,育种工作者必须在异源中寻找同类变异.在小麦上这一方法已获成功.在已被转移的性状中,绝大多数都是对特种病虫的抗性,因为这些性状一般来说,遗传机制比较简单.世界上目前已有近30个小麦品种带有异源的抗病基因.生理或数量性状的遗传一般比较复杂,因此在育种过程中很难掌握.虽然从异源种获
The genetic compositional difference is a prerequisite for the improvement of crop varieties, and one of the most readily accepted sources of variation that may be combined in the short term is formed by another, improved and well-adapted variety through the same crop locally Breeding workers must look for similar variants in heterosis when these variations are depleted to meet breeding requirements, an approach that has been successful in wheat, and most of the traits have been transferred to special pests and diseases Because these traits generally have a relatively simple genetic mechanism, and nearly 30 wheat cultivars worldwide have heterologous disease resistance genes, and the inheritance of physiological or quantitative traits is generally rather complicated. Therefore, during the breeding process Hard to master, though from allogeneic species