Rmg7, a New Gene for Resistance to Triticum Isolates of Pyricularia oryzae Identified in Tetraploid Wheat
Rmg7, a New Gene for Resistance to Triticum Isolates of Pyricularia oryzae Identified in Tetraploid Wheat
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DOI：
10.1094/phyto-06-14-0182-r
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发表时间：
2015-04-01
期刊：
影响因子：
3.2
通讯作者：
Tosa, Yukio
中科院分区：
文献类型：
--
作者：
Tagle, Analiza Grubanzo;Chuma, Izumi;Tosa, Yukio
在四倍体小麦品种St24 （Triticum dicoccum, KU120）中发现了一个抗稻瘟病菌Br48的单基因Rmg7 （resistance to Magnaporthe grisea 7）。另外两个小麦品种Stl7 （T. dicoccum, KU112）和St25 （T. dicoccum, KU122）也对Br48具有抗性，并表现出与St24相似的疾病反应模式。这些抗性材料之间的杂交没有产生敏感的F2幼苗，这表明St24、St17和St25携带相同的抗性基因。此外，在Br48与MZ5-1-6（一株在较高温度下对St24有毒力的Eleusine分离株）之间的随机Fl后代分离分析中，发现了一个与Rmg7对应的单一无毒基因。该无毒基因不仅被St24识别，而且被st7和St25识别，从而支持了上述结果，即所有三个菌株都携带Rmg7。该抗性基因在未来的小麦育种中具有潜在的应用价值。
A single gene for resistance, designated Rmg7 (Resistance to Magnaporthe grisea 7), was identified in a tetraploid wheat accession, St24 (Triticum dicoccum, KU120), against Br48, a Triticum isolate of Pyricularia oryzae. Two other wheat accessions, Stl7 (T. dicoccum, KU112) and St25 (T dicoccum, KU122), were also resistant against Br48 and showed a similar disease reaction pattern to St24. Crosses between these resistant accessions yielded no susceptible F2 seedlings, suggesting that St24, St17, and St25 carry the same resistance gene. Furthermore, a single avirulence gene corresponding to Rmg7 was detected in a segregation analysis of random Fl progenies between Br48 and MZ5-1-6, an Eleusine isolate virulent to St24 at a higher temperature. This avirulence gene was recognized not only by St24, but also by Stl7 and St25, thus supporting the preceding results indicating that all three accessions carry Rmg7. This resistance gene may have potential in future wheat breeding programs.