Loss of virulence of Botrytis cinerea mutants defective in phytotoxin production is restored by modifying inoculation medium.

Abstract excerpt

Botrydial, botcinic acid, and their derivatives are major phytotoxic metabolites produced by the necrotrophic fungal pathogen Botrytis cinerea. These phytotoxins are able to induce programmed cell death in the host and thereby promote plant susceptibility to B. cinerea. We observed that a ∆bot2∆boa6 double-mutant strain, which synthesizes neither botrydial nor botcinic acid, was almost avirulent on tomato leaves...

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