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Some isolates of the plant-pathogenic fungusNectria haematococca mating population (MP) VI metabolize maackiain and medicarpin, two antimicrobial compounds (phytoalexins) synthesized by chickpea (Cicer arietinum L.). The enzymatic modifications by the fungus convert the phytoalexins to less toxic derivatives, and this detoxification has been proposed to be important for pathogenesis on chickpea. In the present study, loci controlling maackiain metabolism (Mak genes) were identified by crosses among isolates ofN. haematococca MP VI that differed in their ability to metabolize the phytoalexin. Strains carryingMak1 orMak2 converted maackiain to 1a-hydroxymaackiain, while those withMak3 converted it to 6a-hydroxymaackiain.Mak1 andMak2 were unusual in that they often failed to be inherited by progeny.Mak1 was closely linked toPda6 , a new member in a family of genes inN. haematococca MP VI that encode enzymes for detoxification of pisatin, the phytoalexin synthesized by garden pea. LikeMak1, Pda6 was also transmitted irregularly to progeny. Although the unusual meiotic behaviors of someMak genes complicate genetic analysis, identification of these genes should afford a more through evaluation of the role of phytoalexin detoxification in the pathogenesis ofN. haematococca MP VI on chickpea.

applied and environmental microbiology

Three Genes for Metabolism of the Phytoalexin Maackiain in the Plant Pathogen <i>Nectria haematococca</i> : Meiotic Instability and Relationship to a New Gene for Pisatin Demethylase

Three Genes for Metabolism of the Phytoalexin Maackiain in the Plant Pathogen Nectria haematococca : Meiotic Instability and Relationship to a New Gene for Pisatin Demethylase