Arrangement of predicted dothistromin genes in Dothistroma septosporum and Cladosporium fulvum.
A) Predicted dothistromin genes within the labeled clusters (left to right) are: Ver1, DotC (Ver1 cluster); PksA, CypX, AvfA, MoxY (PksA cluster); AflR, AflJ (AflR/J cluster); OrdB, AvnA, HexB, HexA, HypC, VbsA (VbsA cluster); Nor1, AdhA, VerB (Nor1 cluster). Positions of mini-clusters are approximate and they are not drawn to scale. Dothistromin genes within the published D. septosporum PksA and VbsA clusters [36], [38] and the newly discovered AflR/J and Nor-1 clusters are found in the same order and orientation in C. fulvum. B) Expression of dothistromin biosynthetic genes (Ver1, PksA, VbsA) and regulatory gene (AflR) was determined in D. septosporum by quantitative PCR. Mean expression and standard deviations are shown for at least 3 biological replicates relative to β-tubulin expression. In D. septosporum all genes but DsVbsA are expressed more highly in planta (late-stage sporulating lesions from a forest sample) than in culture (PDB or B5 media) as highlighted by the dashed-grey line. C) Expression of C. fulvum genes is shown as for (B), revealing that expression is not higher during tomato infection than in culture (dashed-grey line). Note the different scales for expression, which reveal a much lower level of transcription both in planta and in PDB medium compared to D. septosporum.
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