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Antioxidant and enzymatic responses to oxidative stress induced by pre-harvest water supply reduction and ripening on mango (Mangifera indica L. cv. 'Cogshall') in relation to carotenoid content

Rosalie R., Joas J., Deytieux-Belleau C., Vulcain E., Payet B., Dufossé L., Lechaudel M.. 2015. Journal of Plant Physiology, 184 : p. 68-78.

The effects of a reduction in water supply during fruit development and postharvest fruit ripening on the oxidative status and the antioxidant defense system were studied in the mango fruit (Mangifera indica L.) cv. Cogshall. Changes in non-enzymatic (ascorbate) and enzymatic (SOD, CAT, APX, MDHAR, DHAR and GR) antioxidants, as well as oxidative parameters (H2O2 and MDA) and major carotenoids, were measured in unripe and ripe fruits from well-irrigated and non-irrigated trees. Under non-limiting water supply conditions, ripening induced oxidation as a result of the production of ROS and decreased ascorbate content. Antioxidant enzymatic systems were activated to protect fruit tissues and to regenerate the ascorbate pool. The carotenoid pool, mainly represented by beta-carotene and esterified violaxanthine isomers, accumulated naturally duringmangoripening. The suppression of irrigation decreased fruit size and induced accumulation of ABA and of its storage form, ABA-GE, in fruit pulp from the earliest harvest. It also increased oxidation, which was observable by the high levels of ascorbate measured at the early stages at harvest, and by the delay in the time it took to reach the pseudo constant carotene-to-xanthophyll ratio in ripe fruits. Nevertheless, differences between the irrigation treatments on the antioxidant system in ripe fruits were not significant, mainly because of the drastic changes in this system during ripening. (Résumé d'auteur)

Mots-clés : dérivé réactif de l'oxygène; activité enzymatique; mécanisme de défense cellulaire; qualité; développement biologique; aba; irrigation; caroténoïde; technologie après récolte; mûrissage; stress oxydatif; mangifera indica; mangue; réunion

Thématique : Physiologie et biochimie végétales; Culture des plantes; Irrigation; Manutention transport stockage et conservation des produits d'origine végétale

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