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<p>The recent substantial reclassification of ramularioid fungi, agronomically important plant pathogens, highlights the need to reidentify historical isolates and reassess links between species identity and key biological traits. Here, we clarified the taxonomic placement of strain GR1, isolated from a <i>Rumex</i> weed in Japan and recorded as <i>Ramularia pratensis</i>, its original host association, and pathogenicity in problematic <i>Rumex</i> weeds using molecular analyses, morphological characters, and pathogenicity assays. The ITS sequence was identical to the ex-type of <i>Teratoramularia rumicis</i>, whereas the LSU sequence was identical to the ex-type of <i>T. rumicicola</i>. In a concatenated ITS–LSU phylogeny, GR1 clustered with the <i>T. rumicicola</i> ex-type, while the <i>T. rumicis</i> ex-type remained within the same assemblage but on a long branch. On-host morphology provided limited support for the treatment of GR1 as <i>T. rumicicola</i>. The host voucher specimen was morphologically consistent with <i>Rumex japonicus</i>, which developed the original symptoms after inoculation with the pathogen. GR1 caused disease symptoms on <i>Rumex</i> weed species and suppressed their growth. Based on currently available evidence, we treat GR1 as <i>T. rumicicola</i> but note that species boundaries between <i>T. rumicicola</i> and <i>T. rumicis</i> cannot be resolved unambiguously with the limited sampling and multilocus data for <i>T. rumicis</i>. This study provides a taxonomic reassessment of GR1 and supports further evaluation as a candidate for biological control of <i>Rumex</i> weeds.</p>

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Reidentification of Teratoramularia rumicicola strain GR1 in Japan and its pathogenicity on Rumex species

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Masataka Izumi,
  • Toyozo Sato

摘要

The recent substantial reclassification of ramularioid fungi, agronomically important plant pathogens, highlights the need to reidentify historical isolates and reassess links between species identity and key biological traits. Here, we clarified the taxonomic placement of strain GR1, isolated from a Rumex weed in Japan and recorded as Ramularia pratensis, its original host association, and pathogenicity in problematic Rumex weeds using molecular analyses, morphological characters, and pathogenicity assays. The ITS sequence was identical to the ex-type of Teratoramularia rumicis, whereas the LSU sequence was identical to the ex-type of T. rumicicola. In a concatenated ITS–LSU phylogeny, GR1 clustered with the T. rumicicola ex-type, while the T. rumicis ex-type remained within the same assemblage but on a long branch. On-host morphology provided limited support for the treatment of GR1 as T. rumicicola. The host voucher specimen was morphologically consistent with Rumex japonicus, which developed the original symptoms after inoculation with the pathogen. GR1 caused disease symptoms on Rumex weed species and suppressed their growth. Based on currently available evidence, we treat GR1 as T. rumicicola but note that species boundaries between T. rumicicola and T. rumicis cannot be resolved unambiguously with the limited sampling and multilocus data for T. rumicis. This study provides a taxonomic reassessment of GR1 and supports further evaluation as a candidate for biological control of Rumex weeds.