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Epichloë  spp. are symbiotic fungal endophytes of many cool season grasses. The presence of the fungal endophytes often confers insect, drought, and disease tolerance to the host grasses. The presence of the fungal endophytes within the host plants does not elicit host defense responses. The molecular basis for this phenomenon is not known.  Epichloë festucae , the endophyte of  Festuca rubra , expresses a salicylate hydroxylase similar to NahG from the bacterium  Pseudomonas putida . Few fungal salicylate hydroxylase enzymes have been reported. The  in planta  expression of an endophyte salicylate hydroxylase raised the possibility that degradation of plant-produced salicylic acid is a factor in the mechanism of how the endophyte avoids eliciting host plant defenses. Here we report the characterization of the  E. festucae  salicylate hydroxylase, designated  Efe-shyA . Although the fungal enzyme has the expected activity, based on salicylic acid levels in endophyte-free and endophyte-infected plants it is unlikely that expression of the endophyte salicylate hydroxylase is a factor in the lack of a host defense response to the presence of the fungal endophyte.

Functional characterization of salicylate hydroxylase from the fungal endophyte Epichloë festucae