Phytopathology. 2003 Jan;93(1):42-5. doi: 10.1094/PHYTO.2003.93.1.42.
ABSTRACT Host species specificity of Magnaporthe grisea toward foxtail millet was analyzed using F(1) cultures derived from a cross between a Triticum isolate (pathogenic on wheat) and a Setaria isolate (pathogenic on foxtail millet). On foxtail millet cvs. Beni-awa and Oke-awa, avirulent and virulent cultures segregated in a 1:1 ratio, suggesting that a single locus is involved in the specificity. This locus was designated as Pfm1. On cv. Ki-awa, two loci were involved and one of them was Pfm1. The other locus was designated as Pfm2. Interestingly, Pfm1 was not involved in the pathogenic specificity on cv. Kariwano-zairai. These results suggest that there is no "master gene" that determines the pathogenic specificity on all foxtail millet cultivars and that the species specificity of M. grisea toward foxtail millet is governed by cultivar-dependent genetic mechanisms that are similar to gene-for-gene interactions controlling race-cultivar specificity.
摘要 使用从小麦分离的（对小麦致病）菌株与从谷子分离的（对谷子致病）菌株杂交产生的 F1 培养物，分析了稻瘟病菌对谷子的种特异性。在谷子品种“Beni-awa”和“Oke-awa”上，无毒和有毒培养物按 1:1 的比例分离，表明一个单一的基因座参与了特异性。这个基因座被指定为 Pfm1。在品种“Ki-awa”上，有两个基因座参与，其中一个是 Pfm1。另一个基因座被指定为 Pfm2。有趣的是，Pfm1 不参与品种“Kariwano-zairai”上的致病性特异性。这些结果表明，不存在决定所有谷子品种致病性特异性的“主基因”，稻瘟病菌对谷子的种特异性受品种依赖性遗传机制的控制，类似于控制小种-品种特异性的基因对基因相互作用。
