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Background  The fungus  Colletotrichum gloeosporioides  f. sp.  aeschynomene  produces high levels of indole-3-acetic acid (IAA) in axenic cultures and during plant infection. We generated a suppression subtractive hybridization library enriched for IAA-induced genes and identified a clone, which was highly expressed in IAA-containing medium.    Results  The corresponding gene showed similarity to oligopeptide transporters of the OPT family and was therefore named  CgOPT1 . Expression of  CgOPT1  in mycelia was low, and was enhanced by external application of IAA.  cgopt1 -silenced mutants produced less spores, had reduced pigmentation, and were less pathogenic to plants than the wild-type strain. IAA enhanced spore formation and caused changes in colony morphology in the wild-type strain, but had no effect on spore formation or colony morphology of the  cgopt1 -silenced mutants.    Conclusion  Our results show that IAA induces developmental changes in  C. gloeosporioides . These changes are blocked in  cgopt1 -silenced mutants, suggesting that this protein is involved in regulation of fungal response to IAA.  CgOPT1  is also necessary for full virulence, but it is unclear whether this phenotype is related to auxin.

CgOpt1, a putative oligopeptide transporter from Colletotrichum gloeosporioides that is involved in responses to auxin and pathogenicity