Por: Federico J. Berli, Martín Fanzone, Patricia Piccoli, and Rub en Bottini. En: Journal of Agriculture and Food Chemistry, J. Agric. Food Chem. 2011, 59, 4874-4884.
It has been previously found that abscisic acid (ABA) participates in the activation of grapevine leaf tissue defense against potentially damaging effects of solar ultraviolet-B radiation (UV-B), apparently by triggering biosynthesis of phenols that filter the harmful radiation and act as antioxidants. The present work studies the effect of solar UV-B and exogenously applied ABA on berry growth, sugar accumulation, and phenol (anthocyanin and nonanthocyanin) profiles across berry development and ripening of Vitis vinifera L. cv. Malbec in a vineyard at 1450 m of altitude. The grapevines were exposed to relatively high UV-B irradiation (normal sunlight;þUV-B) and also to a reduced UV-B treatment (filter exclusion; UV-B). These two UV-B treatments were combined with weekly spray applications to the leaves and berries of 1 mM ABA (þABA) or H2O ( ABA). Reduction of UV-B delayed berry development and maturation, whereas the þUV-B and þABA combined treatment hastened berry sugar and phenol accumulation. þUV-B/þABA treatments also reduced berry growth and decreased sugar per berry without affecting sugar concentration ( Brix) at harvest. Berry skin ABA levels were higher in the þUV-B and þABA combined treatment, which also hastened the onset of ripening up to 20 days. Berry skin ABA levels then decreased toward harvest, implying a possible role for ABA in the control of ripening in this nonclimacteric fruit. Under both þUV-B and þABA treatments berry skin phenols were additively increased with a change in anthocyanin and nonanthocyanin profiles and increases in the proportion of phenols with high antioxidant capacity.Solar UV-B and ABA
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