新品种对作物的增产和稳产确实起着重要的作用,但育成新品种要付出极大的努力,一般需要10年以上时间.由于小麦叶锈病在日本普遍发生,特别是日本北部分布着致病性强的生理小种,所以很有必要将小麦及其近缘异属种植物的抗病基因导入栽培品种.但育成有价值的品种,较育成普通品种多费时间,而且必须同时考虑到有致病性的生理小种不断分化的可能.作为抗病育 The new variety does play an important role in increasing yield and stable yield of crops, but great efforts have been made to cultivate new varieties, which generally takes more than 10 years.Because leaf rust in wheat is common in Japan, especially in northern Japan Therefore, it is necessary to introduce the disease-resistant genes of wheat and its related heterologous species into the cultivated species.But breeding valuable varieties is more time-consuming than breeding ordinary varieties, Pathogenic races are likely to differentiate