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Restriction fragment length polymorphism (RFLP) analysis for DNA products amplified by the polymerase chain reaction (PCR) was used for the direct detection of Rhizoctonia solani AG 1 IA and AG 2-2 IIIB, R. oryzae, R. oryzae-sativae and R. fumigate from the diseased rice sheaths. A rapid DNA extraction method with a solution of sodium hydroxide was conducted to extract parasite DNA from diseased rice sheaths. 28S ribosomal DNA (rDNA) derived from fungal genomic DNA extracted by the alkaline method was specifically PCR-amplified. The results of PCR-RFLP analysis for DNA samples from artificially inoculated rice sheath tissues with each Rhizoctonie spp. and the corresponding culture on the medium using two restriction enzymes, Hhal and Mspl, showed identical polymorphisms. PCR-RFLP analysis using DNA samples from naturally infected rice sheath tissues also revealed the possibility of direct diagnosis of R. solaniAG 1 IA, R. oryzae and R. oryzae-sativae.
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Matsumoto et al. (1997) studied this question.
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