Metabolism of Eicosapolyenoic Acid Lipids in Race Specific Interactions Between Phytophthora infestans and Potato
Arachidonic (AA) and eicosapentaenoic (EPA) acids are efficient elicitors of the metabolic cascade occurring in potato tuber during hypersensitivity expression,1, 2, 3 Important components of this cascade include the accumulation of sesquiterpene phytoalexins, deposition of lignin and hydroxyproline in tuber cell walls, evolution of ethylene and ethane, and stimulation of oxidative enzymes. Induction of this response following inoculation with incompatible races of the fungal pathogen, Phytophthora infestans, in which EPA and AA occur primarily as esters in membrane and storage lipids, restricts fungal ingress and prevents colonization of host tissue.4,5 Compatible isolates of the pathogen colonize potato tissue and defense reactions are not induced. The interaction between P. infestans and potato provides a unique opportunity for the study of bioTogically active lipids in recognition phenomena in plant-pathogen interaction.
KeywordsPotato Tuber Hypersensitive Response Phytophthora Infestans Polar Lipid Fraction Elicitor Activity
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