A Gene-for-Gene Relationship Underlying the Species-Specific Parasitism of Avena/Triticum Isolates of Magnaporthe grisea on Wheat Cultivars.
A Gene-for-Gene Relationship Underlying the Species-Specific Parasitism of Avena/Triticum Isolates of Magnaporthe grisea on Wheat Cultivars.
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DOI：
10.1094/phyto.2002.92.11.1182
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发表时间：
2002-11
期刊：
影响因子：
3.2
通讯作者：
N. Takabayashi;Y. Tosa;H. Oh;S. Mayama
中科院分区：
文献类型：
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作者：
N. Takabayashi;Y. Tosa;H. Oh;S. Mayama
摘要 为了阐明稻瘟病菌物种特异性寄生的遗传机制，将小麦分离株（对小麦致病）与燕麦分离株（对燕麦致病）杂交，所得 F(1) 后代对小麦品种进行了分离分析。 《诺林4》和《中国之春》。我们发现了两个真菌位点Pwt3和Pwt4，它们参与了对小麦的特异性寄生。 Pwt3 对两个品种均起作用，而 Pwt4 仅对“Norin 4”起作用。利用Pwt4的品种特异性，在'Norin 4'中成功鉴定出其相应的抗性基因，并命名为Rmg1（Rwt4）。相应抗性基因的存在表明Pwt4是无毒基因座。 Pwt3 由于其温度敏感性而被认为是无毒基因座。我们认为基因与基因的相互作用是稻瘟病菌物种特异性寄生的基础。
ABSTRACT To elucidate genetic mechanisms of the species-specific parasitism of Magnaporthe grisea, a Triticum isolate (pathogenic on wheat) was crossed with an Avena isolate (pathogenic on oat), and resulting F(1) progeny were subjected to segregation analyses on wheat cvs. Norin 4 and Chinese Spring. We found two fungal loci, Pwt3 and Pwt4, which are involved in the specific parasitism on wheat. Pwt3 operated on both cultivars while Pwt4 operated only on 'Norin 4'. Using the cultivar specificity of Pwt4, its corresponding resistance gene was successfully identified in 'Norin 4' and designated as Rmg1 (Rwt4). The presence of the corresponding resistance gene indicated that Pwt4 is an avirulence locus. Pwt3 was assumed to be an avirulence locus because of its temperature sensitivity. We suggest that gene-for-gene interactions underlie the species-specific parasitism of M. grisea.