DNA base sequence homology among AG-4 isolates of Rhizoctonia solani was determined by DNA-DNA reassociation kinetics. Six of 14 isolates examined shared high homology ranging from 88.5 to 92.6% [AG-4 homogeneous group I (HG-I)]. There was also a high homology among the remaining 8 isolates, ranging from 88.7 to 101.3% [AG-4 homogeneous group II (HG-II)]. Relatively low values (30.9 to 47.9%) of DNA homology were found when the above two groups were compared. The genetic divergence between the two groups was also clearly demonstrated by the electrophoretic patterns of proteins and cultural appearances. These results indicate that AG-4 involved two types of isolates that are genetically divergent.
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Kuninaga et al. (1984) studied this question.