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<p>Two <i>Bremia lactucae</i> isolates were obtained from infected lettuce (<i>Lactuca sativa</i>) plants in fields in Kagawa Prefecture. The two isolates exhibited distinct reaction phenotypes compared to those of races in Hyogo Prefecture previously characterized by the International Bremia Evaluation Board, suggesting the presence of unreported races in Japan. Some commercial lettuce cultivars with resistance genes supported minimal sporulation of an isolate, confirming their effectiveness for disease control. When wild <i>L. serriola</i> collected from three regions was inoculated with the other isolate, the isolate only sporulated on plants from Hiroshima Prefecture. <i>L. sativa</i> cotyledons inoculated with sporangia of the isolate from <i>L. serriola</i> also sporulated, providing evidence of cross-infection of <i>L. sativa</i> and <i>L. serriola</i> by <i>B. lactucae</i> in Japan. The presence of new <i>B. lactucae</i> races and the regional susceptibility of <i>L. serriola</i> to <i>B. lactucae</i> may be influenced by practices such as weed management and crop rotation, including paddy rice cultivation.</p>

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Discovery of new races of Bremia lactucae on Lactuca sativa in Kagawa Prefecture, Japan and cross-infection of L. sativa and wild L. serriola by B. lactucae

  • 期刊论文

  • 发表日期：

    2026年2月5日

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  • Fumihiro Nishimura,
  • Takahiro Katayama,
  • Mamoru Satou,
  • Kenichi Ikeda

摘要

Two Bremia lactucae isolates were obtained from infected lettuce (Lactuca sativa) plants in fields in Kagawa Prefecture. The two isolates exhibited distinct reaction phenotypes compared to those of races in Hyogo Prefecture previously characterized by the International Bremia Evaluation Board, suggesting the presence of unreported races in Japan. Some commercial lettuce cultivars with resistance genes supported minimal sporulation of an isolate, confirming their effectiveness for disease control. When wild L. serriola collected from three regions was inoculated with the other isolate, the isolate only sporulated on plants from Hiroshima Prefecture. L. sativa cotyledons inoculated with sporangia of the isolate from L. serriola also sporulated, providing evidence of cross-infection of L. sativa and L. serriola by B. lactucae in Japan. The presence of new B. lactucae races and the regional susceptibility of L. serriola to B. lactucae may be influenced by practices such as weed management and crop rotation, including paddy rice cultivation.