Oxidative stress responses during cassava post-harvest physiological deterioration |
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Authors: | Kim?Reilly Rocío?Góomez-Váasquez Holger?Buschmann Joe?Tohme Email author" target="_blank">John?R?BeechingEmail author |
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Institution: | (1) Department of Biology & Biochemistry, University of Bath, BA2 7AY Bath, UK;(2) International Centre for Tropical Agriculture (CIAT), AA 6713 Cali, Colombia;(3) Present address: Department of Agroecology in the Tropics & Subtropics, University of Hohenheim (380), 70593 Stuttgart, Germany |
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Abstract: | A major constraint to the development of cassava (Manihot esculenta Crantz) as a crop to both farmers and processors is its starchy storage roots’ rapid post-harvest deterioration, which can render it unpalatable and unmarketable within 24–72 h. An oxidative burst occurs within 15 min of the root being injured, that is followed by the altered regulation of genes, notably for catalase and peroxidase, related to the modulation of reactive oxygen species, and the accumulation of secondary metabolites, some of which show antioxidant properties. The interactions between these enzymes and compounds, in particular peroxidase and the coumarin, scopoletin, are largely confined to the vascular tissues where the visible symptoms of deterioration are observed. These, together with other data, are used to develop a tentative model of some of the principal events involved in the deterioration process. |
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Keywords: | cassava catalase peroxidase post-harvest physiological deterioration reactive oxygen species superoxide dismutase |
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