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We reported previously that a 3.6-kb double-stranded RNA, designated as M2, is associated with hypovirulence in the Rhizoctonia solani isolate Rhs1A1 and proposed that the M2-encoded putative polypeptide A (pA) might interfere with the regulation of the quinate and shikimate pathways. In this study, Western blot analysis showed that a protein band of the predicted size (83kDa) binds antibodies specific to a pA epitope and is detectable in M2-containing but not in M2-lacking cultures. A mRNA, associated with Rhs1A1 polysomes immunoprecipitated with anti-pA antibodies, has a sequence basically identical to that of the sense-strand of M2. The normally inducible quinate pathway was constitutively expressed, whereas the shikimate pathway was down-regulated in the M2-containing, hypovirulent Rhs1A1. Finally, the relative concentration of phenylalanine, precursor of the virulence determinant phenylacetic acid, was correlated with the degree of pathogenicity in the virulent Rhs1AP but not in the hypovirulent Rhs1A1.
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