ENZYME ACTIVITY ASSOCIATED WITH RESISTANCE IN POTATO TO THE EARLY STAGES OF GLOBODERA PALLIDA INFECTION

S. F. A. Amalraj

Abstract


Four potato genotypes of varying sensitivity to the potato cyst nematode, Globodera pallida, were studied for the pattern of accumulation of four enzymes, namely, lypoxygenase, peroxidase, polyphenol oxidase and phenylalanine ammonia lyase. All enzymes were found to be proportionately higher in resistant plants after inoculation or wounding. The activities of peroxidase, poly phenol oxidase and phenylalanine ammonia lyase increased with the increase of days after inoculation and wounding in all potato clones, while that of lypoxygenase decreased. Although the hypersensitive response was suppressed in potatoes against cyst nematode infection, the enzyme requisites for hypersensitivity were present as evident by the enrichment of lypoxygenase, peroxidase and polyphenol oxidase. The total size of the enzyme pool was large in resistant plants, indicating its value as a marker for screening and selection.

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