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Comparison of sequences for the internal transcribed spacer region in Rhizoctonia solani AG 1-ID and other subgroups of AG 1

Abstract

The rDNA-ITS sequence of Rhizoctonia solani AG 1-ID was determined and compared to those of R. solani AG 1-IA, AG 1-IB, and AG 1-IC. The similarity of the isolates from each AG 1 subgroup was almost identical (99%–100%), whereas it was lower between subgroups (91%–95%) than within subgroups. Phylogenetic analysis indicated that isolates of AG 1-ID and other subgroups were separately clustered. Isolates of R. solani AG 1 were clearly separated from R. solani AG 2-1, AG 4, and binucleate Rhizoctonia AG-Bb and AG-K. These results showed that analysis of the rDNA-ITS sequence is an optimal criterion for differentiating R. solani AG 1-ID from other subgroups of R. solani AG 1.

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Correspondence to Mitsuro Hyakumachi.

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Toda, T., Mghalu, J., Priyatomojo, A. et al. Comparison of sequences for the internal transcribed spacer region in Rhizoctonia solani AG 1-ID and other subgroups of AG 1. J Gen Plant Pathol 70, 270–272 (2004). https://doi.org/10.1007/s10327-004-0123-x

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Key words

  • Rhizoctonia solani AG 1-ID
  • rDNA-ITS sequence
  • Phylogenetic analysis