ASCRIPTION OF Nt-ISOLATES OF RHIZOCTONIA SOLANI TO ANASTOMOSIS GROUP 2-1 (AG-2-1) ON ACCOUNT OF rDNA-ITS SEQUENCE SIMILARITY

S. Kuninaga, R. Nicoletti, E. Lahoz, S. Naito

Abstract


A homogeneous group of Rhizoctonia solani isolates from tobacco, which showed intermediate features between anastomosis groups BI and 2-1 (AG-BI and AG- 2-1), was recently characterized. It was not conclusively assigned to any previously known AG and was provisionally named ‘Nt-isolates’. The rDNA sequence similarity in the ITS1 region of the Nt-isolates was evaluated and a high similarity (> 90%) was found with AG-2- 1 tester isolates, while it was remarkably lower with tester isolates from AG-BI and other AG-2 subgroups. Therefore, despite a low anastomosis frequency, Nt-isolates are to be considered members of AG-2-1.

Keywords


Rhizoctonia solani; anastomosis groups; tobacco; rDNA sequence similarity.

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DOI: http://dx.doi.org/10.4454/jpp.v82i1.1146

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EDIZIONI ETS, Pisa, Italy