对洛夫林10小麦品种能致病的叶锈菌小种群在不断上升,给抗病育种带来了威胁。本试验选用的小麦品种有目前参加品比、区试和生产上推广的53个优良品种,其中38个其亲本是以洛夫林10为抗源。用对洛夫林10能致病的7个优势小种,和对洛夫林10不能致病的4个优势小种与这些品种进行相互作用研究。结果表明,以洛夫林10为抗源所培育的品种对“洛10”小种不是都感染的,它们与叶锈菌的亲和率为22％,不以洛夫林为抗源的品种与叶锈菌的亲和率则为42％。另外还有4个以洛夫林10为抗源的品种对参试的所有小种都抵抗,说明洛夫林10这个品种作为叶锈病抗源,目前在生产上对叶锈病的防治还有相当的价值。然而,研究也表明,除了“洛10”小种群外,有些非“洛10”小种对以洛夫林10为抗源的品种也能致病,这说明抗性基因在一定的遗传背景中起作用,而在另一些背景中不一定起作用。为此,应避免抗源单一化,并加强遗传学研究,大力筛选新抗源,使抗病性建立在抗源多样化的稳固基础之上。 The small population of leaf rust that can cause disease in Lovrin 10 wheat varieties is rising, posing a threat to disease-resistant breeding. The wheat varieties used in this experiment include 53 excellent cultivars that are currently involved in product ratio, zone test and production promotion. 38 of them are based on Lovrin 10. Interaction studies with these cultivars were conducted using seven dominant races that could cause disease in Lovrin 10 and four dominant races that could not cause disease in Lovrin 10. The results showed that the varieties cultivated with Lovrin 10 as the resistant source were not all susceptible to the race of “Luo 10”, and their affinity with leaf rust was 22%. Lovrin-resistant varieties Affinity with leaf rust was 42%. In addition, four varieties resistant to Lovrin 10 were also resistant to all tested races, indicating that Lovrin 10 is the source of leaf rust resistance and is currently in control of leaf rust in production the value of. However, the study also showed that except for the “Luo 10” small population, some non-“Luo 10” races could also cause disease to Lovrin 10-resistant breeds, indicating that the resistance genes are in a certain genetic background Work, but not necessarily in other contexts. To this end, we should avoid the single source of resistance and strengthen genetic research, vigorously screen new sources of resistance, and make the disease resistance based on the firm foundation of diverse sources of resistance.