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<p><i>Rhizoctonia</i> is among the most important soilborne pathogens responsible for causing lettuce diseases worldwide. In this study, a total of 59 <i>Rhizoctonia</i> isolates obtained from lettuce plants with bottom rot symptoms in seven states producers in Brazil were studied using phylogenetic analysis of the internal transcribed spacer (ITS) region of rDNA as well as pathogenicity tests. Fifty-five isolates were identified as <i>R. solani</i> and four isolates as binucleate <i>Rhizoctonia</i> (BNR). Thirty-nine isolates (66.1%) belonged to anastomosis group AG-1 IB, nine (15.3%) to AG-4 HGI, four (6.8%) to AG-2–2 IIIB, three (5.1%) to AG-4 HGIII, two (3.4%) to AG-A, one (1.7%) to AG-L and one (1.7%) to AG–P. AG-1 IB isolates were widely distributed and recovered from six out of seven Brazilian states, including 10 lettuce-growing fields. Only two isolates were not pathogenic to lettuce. Significant differences in aggressiveness were observed among different isolates and AGs, with AG-1 IB showing higher aggressiveness to lettuce leaves compared to other AGs. This study represents the first detailed report on the AG composition of <i>Rhizoctonia</i> populations causing bottom rot of lettuce in different Brazilian regions. Additionally, this is the first time that AG-2–2 IIIB, AG-A, AG-L, and AG–P have been associated with this disease worldwide.</p>

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Diversity and pathogenicity of anastomosis groups of Rhizoctonia associated with bottom rot of field-grown lettuce in Brazil

  • 期刊论文

  • 发表日期：

    2025年3月29日

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  • Diana Laura Benitez-Andrade,
  • Dora Aguirre-Castro,
  • Tamiris Joana Santos Rêgo,
  • Kamila Câmara Correia,
  • Ailton Reis,
  • Santos Gerardo Leyva-Mir,
  • Juan Manuel Tovar-Pedraza,
  • Sami Jorge Michereff

摘要

Rhizoctonia is among the most important soilborne pathogens responsible for causing lettuce diseases worldwide. In this study, a total of 59 Rhizoctonia isolates obtained from lettuce plants with bottom rot symptoms in seven states producers in Brazil were studied using phylogenetic analysis of the internal transcribed spacer (ITS) region of rDNA as well as pathogenicity tests. Fifty-five isolates were identified as R. solani and four isolates as binucleate Rhizoctonia (BNR). Thirty-nine isolates (66.1%) belonged to anastomosis group AG-1 IB, nine (15.3%) to AG-4 HGI, four (6.8%) to AG-2–2 IIIB, three (5.1%) to AG-4 HGIII, two (3.4%) to AG-A, one (1.7%) to AG-L and one (1.7%) to AG–P. AG-1 IB isolates were widely distributed and recovered from six out of seven Brazilian states, including 10 lettuce-growing fields. Only two isolates were not pathogenic to lettuce. Significant differences in aggressiveness were observed among different isolates and AGs, with AG-1 IB showing higher aggressiveness to lettuce leaves compared to other AGs. This study represents the first detailed report on the AG composition of Rhizoctonia populations causing bottom rot of lettuce in different Brazilian regions. Additionally, this is the first time that AG-2–2 IIIB, AG-A, AG-L, and AG–P have been associated with this disease worldwide.