Race 3, a new race of Fusarium oxysporum f. sp. lactucae determined by a differential system with commercial cultivars.
Race 3, a new race of Fusarium oxysporum f. sp. lactucae determined by a differential system with commercial cultivars.
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DOI：
10.1007/s10327-002-0009-8
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发表时间：
2003-02-01
影响因子：
1.2
通讯作者：
Kojima, Mineo
中科院分区：
文献类型：
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作者：
Fujinaga, Masashi;Ogiso, Hideki;Kojima, Mineo
26个尖孢镰刀菌日本分离物的致病力变异。以21个生菜品种为试材，筛选出商品生菜品种作为小种分化指标。品种哥斯达黎加4号对1号生理小种抗性，对2号生理小种感病，与常规标准鉴别品系VP1010一致。板栗红火对1号生理小种感病，2号生理小种抗性，表现出与VP1013相反的反应类型。品种爱国者对两个小种都感病。3个品种在田间条件下的抗病反应与苗期观察到的反应一致。因此，cv.哥斯达黎加第4号和cv.板栗红火病菌可作为鉴别寄主，鉴定其致病小种。结果表明，从日本福冈地区的毛头生菜上分离到的FOL菌株均为新的小种(即对3个品种致病)。我们建议将该新小种命名为3号小种。从加州获得的生菜枯萎病病原菌FOL的反应与1号小种相同。此外，日本分离物SB1-1(1号小种)与加州分离物HL-2属于同一营养亲和性群。我们的结果表明，这两种真菌是相同的特异形。
Pathogenic variation among 26 Japanese isolates of Fusarium oxysporum f. sp. lactucae (FOL) was tested using 21 lettuce cultivars to select commercial lettuce cultivars as race differential indicators. Cultivar Costa Rica No. 4 was resistant to race 1 but susceptible to race 2, consistent with the conventional standard differential line VP1010. Cultivar Banchu Red Fire was susceptible to race 1 but resistant to race 2, which showed an opposite type of reaction as another differential line VP1013. Cultivar Patriot was susceptible to both races. The resistance reactions of the three cultivars under field conditions were identical with that observed in the seedlings. Thus cv. Costa Rica No. 4 and cv. Banchu Red Fire can be used as differential hosts to identify pathogenic races of FOL. This differential system showed that all FOL isolates obtained from diseased butterhead lettuce in Fukuoka, Japan were new races (i.e., pathogenic to three cultivars). We propose that the new race be designated race 3. Isolates of FOL, the pathogen of Fusarium wilt in lettuce, obtained from California showed the same reaction as that of race 1. Furthermore, the Japanese isolate SB1-1 (race 1) and California isolate HL-2 belonged to the same vegetative compatibility group. Our results suggest that both of the fungi are the same forma specialis.