Modification of the Health-Promoting Value of Potato Tubers Field Grown under Drought Stress: Emphasis on Dietary Antioxidant and Glycoalkaloid Contents in Five Native Andean Cultivars (Solanum tuberosum L.).

André, Christelle;Schafleitner, Roland;Guignard, Cédric;Oufir, Mouhssin;Larondelle, Yvan;et.al.
(2008) Journal of agricultural and food chemistry — Vol. 57, n° 2, p. 599-609 (2009)

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Authors
  • André, ChristelleUCLouvain
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  • Schafleitner, Roland
    Author
  • Guignard, Cédric
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  • Oufir, Mouhssin
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  • Larondelle, YvanUCLouvain
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Abstract
The effects of drought stress on dietary antioxidant and glycoalkaloid contents in potato tubers were investigated using a selection of five native Andean cultivars. Both freshly harvested and 4 month-stored tubers were analyzed. Responses to drought stress were highly cultivar-specific. The antioxidant contents of the yellow tuber-bearing cultivars (Sipancachi and SS-2613) were weakly affected by the drought treatment, whereas the pigmented cultivars demonstrated highly cultivar-dependent variations. A drastic reduction of anthocyanins and other polyphenols was revealed in the red- (Sullu) and purple-fleshed (Guincho Negra) cultivars, whereas an increase was shown in the purple-skinned and yellow-fleshed cultivar (Huata Colorada). The hydrophilic antioxidant capacity (evaluated by Folin-Ciocalteu and H-oxygen radical absorbance capacity assays) was highly correlated with the polyphenol content and followed, therefore, the same behavior upon drought. Carotenoid contents, including beta-carotene, as well as vitamin E, tended to increase or remain stable following drought exposure, except for the cultivar Sullu, in which the level of these lipophilic antioxidants was decreased. Vitamin C contents were not affected by drought with the exception of Guincho Negra, in which the level was increased. These variations of health-promoting compounds were associated with increased or stable levels of the toxic glycoalkaloids, alpha-solanine and alpha-chaconine. Storage at 10 degrees C for 4 months tended to decrease the concentrations of all dietary antioxidants, except those of vitamin E. This storage also reduced the drought-induced variations observed in freshly harvested tubers. These results were discussed in terms of their implications for human diet and health as well as in plant stress defense mechanisms.
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André, C., Schafleitner, R., Guignard, C., Oufir, M., Aliaga, C. A. A., Nomberto, G., Hoffmann, L., Hausman, J.-F., Evers, D., & Larondelle, Y. (2008). Modification of the Health-Promoting Value of Potato Tubers Field Grown under Drought Stress: Emphasis on Dietary Antioxidant and Glycoalkaloid Contents in Five Native Andean Cultivars (Solanum tuberosum L.). Journal of agricultural and food chemistry, 57(2), 599-609. https://doi.org/10.1021/jf8025452 (Original work published 2009)