Articles
SALICYLIC ACID OVERRIDES THE EFFECT OF METHYL JASMONATE ON THE TOTAL ANTIOXIDANT CAPACITY OF TABLE GRAPES
Article number
841_67
Pages
495 – 498
Language
English
Abstract
Previous studies in plant tissues have documented the elicitation of antioxidants by exogenous application of salicylic acid (SA) and methyl jasmonate (MJ). Yet, both synergistic and antagonistic effects of these pervasive signal molecules have been reported.
This study investigated the antioxidant response in table grapes (Vitis vinifera Crimson Seedless) to these elicitors using a novel assay; Antioxidant Inhibition of Oxygen Radicals (AIOR: Ching et al., 2006). We applied four, five–fold increments of SA (0.2-25 mM) and MJ (0.04-5 mM), alone or in combination to whole bunches of harvested grapes, prior to cool-storage.
Berries were sub-sampled at 14, 28 and 56 days postharvest.
The dose effects of MJ and SA were disparate: after an initial increase, the antioxidant capacity of MJ-treated grapes declined significantly (P=0.010), whereas SA elicited a significant increase (P<0.001). Importantly, when applied in combination (SA+MJ) the response was not different from that of SA–only, indicating that SA completely overrode the negative effect of MJ. To our knowledge this is the first report of data suggestive that salicylates may override aspects of the signalling cascade of jasmonates in grapes.
This study investigated the antioxidant response in table grapes (Vitis vinifera Crimson Seedless) to these elicitors using a novel assay; Antioxidant Inhibition of Oxygen Radicals (AIOR: Ching et al., 2006). We applied four, five–fold increments of SA (0.2-25 mM) and MJ (0.04-5 mM), alone or in combination to whole bunches of harvested grapes, prior to cool-storage.
Berries were sub-sampled at 14, 28 and 56 days postharvest.
The dose effects of MJ and SA were disparate: after an initial increase, the antioxidant capacity of MJ-treated grapes declined significantly (P=0.010), whereas SA elicited a significant increase (P<0.001). Importantly, when applied in combination (SA+MJ) the response was not different from that of SA–only, indicating that SA completely overrode the negative effect of MJ. To our knowledge this is the first report of data suggestive that salicylates may override aspects of the signalling cascade of jasmonates in grapes.
Publication
Authors
M. Considine, C. Gordon, K. Croft, S. Ching
Keywords
Vitis vinifera, postharvest, dietary health, elicitor, signalling, phenolics
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