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The biosynthesis of phytotoxin thaxtoimn A (TXT) constitutes the major pathogenicity determinant in Streptomyces scabies, the most widely-studied phytopathogen causing scab disease in potato and other root crops. It is recognized that S. scabies regulates its pathogenicity via γ-butyrolactone (GBL)-dependent quorum sensing (QS) signaling. AttM, from Agrobacterium tumefaciens C58 strain, has recently been proposed to have GBL-assimilative capacity. Here, we presented the introduction of A. tumefaciens-derived attM gene into S. scabies using the E. coli-Streptomyces shuttle vector pIJ8600 via intergeneric conjugation, followed by the investigation of secondary metabolism (mycelium growth, TXT production and pathogenicity) in S. scabies attM exconjugants (S.s/attM) in comparison to their wild-type parent strain (S.s/WT). Among the resultant S.s/attM exconjugants, attM was found to be integrated into S. scabies chromosome as analyzed by southern blotting. Moreover, S.s/attM failed to evoke the disease symptoms in planta and displayed altered morphological differentiation in contrast to S.s/WT. The abolishment of TXT production in S.s/attM substantiated the loss of pathogenicity, and also implied that attM, when constitutively expressed in S. scabies, could paralyze its GBL signaling pathway. Altogether, lactonase-coding gene attM would be useful in a quorum quenching strategy for plant protection via suppressing TXT production and pathogenicity of S. scabies. This article is protected by copyright. All rights reserved.
This article was published in the following journal.
Name: Letters in applied microbiology
With few exceptions, thaxtomin A (ThxA), a nitrated diketopiperazine, is the pathogenicity determinant for plant pathogenic Streptomyces species. In Streptomyces scabiei (syn. S. scabies), the ThxA bi...
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