ENZYMATIC AND NON ENZYMATIC ANTIOXIDATIVE DEFENSE SYSTEM OF CASSAVA GENOTYPES DURING POSTHARVEST DETERIORATION

S. SOWMYAPRIYA¹, M.K. KALARANI²*, P. JEYAKUMAR³, Z.J. KENNEDY⁴, M. VELMURUGAN⁵, T. ARUMUGAM^6
1Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
²Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
³Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
⁴Post Harvest Technology Centre, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
⁵Tapioca and Castor Research Station, Yethapur, 636 119, Salem, Tamil Nadu, India
⁶Department of Vegetable Crops, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
* Corresponding Author : kalatnau@yahoo.co.in

Received : 24-01-2017     Accepted : 07-02-2017     Published : 24-02-2017
Volume : 9     Issue : 9       Pages : 3937 - 3941
Int J Agr Sci 9.9 (2017):3937-3941

Keywords : Postharvest physiological deterioration, hydrogen cyanide, carotenoids, flavonoids, phenolics, peroxidase and catalase
Academic Editor : Dr Harsimrat K Bons, Game Bhanudas, Singh Smita
Conflict of Interest : None declared
Acknowledgements/Funding : The authors thank the Professor and Head, Tapioca and Castor Research Station, Yethapur, Salem, Tamil Nadu for timely provided the cassava planting materials from cassava germplasm bank for this research work
Author Contribution : This is the part of Ph.D student’s thesis work (first author S. Sowmyapriya) and all the authors participates in the work in a substantive way and contributed equally

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.