ENZYMATIC AND NON ENZYMATIC ANTIOXIDATIVE DEFENSE SYSTEM OF CASSAVA GENOTYPES DURING POSTHARVEST DETERIORATION
Journal Title: International Journal of Agriculture Sciences - Year 2017, Vol 9, Issue 9
Abstract
Postharvest Physiological Deterioration (PPD) is the major problem in cassava that renders the roots unmarketable, thereby reducing the economic value of the crop. The increased production of toxic oxygen derivatives is considered to be a universal feature during post harvest period. It is clear that the capacity and activity of anti oxidative defense system are important in destroying active oxygen species that are produced in excess of those normally required for metabolism. The present study was undertaken to assess the effect of PPD and hydrogen cyanide (HCN) on antioxidant scavenging system of four cassava genotypes. Tubers from four different cassava genotypes were evaluated at 1, 3, 5, 7, 9, 11, 13 and 15 days after harvest for PPD. PPD was observed along with HCN content accumulation and also analyzed enzymatic and non enzymatic antioxidants changes with postharvest physiological deterioration (PPD). The results revealed that, cassava genotypes CI-850 accumulated less HCN content and delayed PPD with increased non enzymatic antioxidants of carotenoids, flavonoids and phenolics. Also over production of peroxidase and catalase was found even at five days after harvest. This genotype can be used as novel donor for development of PPD tolerant cassava genotypes.
Authors and Affiliations
M. K. KALARANI
Keywords
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