Biochemical basis of resistance in papaya genotypes systemically infected with Papaya ringspot virus
Publication Date : 29/06/2015
Papaya ringspot disease caused by Papaya ringspot virus (PRSV) has been identified as a serious threat to papaya in Indian subcontinent. Symptoms of disease include mosaic, shoestring and ringspot symptoms on leaves. Fruits also become disfigured with ringspot symptoms. However little is known about the plant virus interaction. In the present investigation, phenol, total soluble protein content, activities of defense related enzymes like peroxidase, polyphenol oxidase and phenylalanine ammonia-lyase were quantitatively estimated in the leaves of resistant (Pusa Nanha) and highly susceptible (local cultivar) genotypes of papaya (Carica papaya L.). The results revealed a significant increase in amount of phenol, protein and defense related enzymes in inoculated plants of resistant genotype, indicating their positive correlation with disease resistance, thus this can be considered as a biochemical marker for studying host pathogen interactions.
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