Effect of chemical elicitors on physico-chemical quality of grape (Vitis vinifera L.) cv. Pusa Navrang
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Date
2019
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DIVISION OF FRUITS AND HORTICULTURAL TECHNOLOGY ICAR-INDIAN AGRICULTURAL RESEARCH INSTITUTE NEW DELHI
Abstract
‘Pusa Navrang’ is one of the important early maturing grape variety recommended for
juice making in India. The present investigation was carried out during 2016-2017 and
2017-2018 at the Division of Fruits and Horticultural Technology, ICAR-Indian
Agricultural Research Institute, New Delhi. The study was conducted under subtropical climatic conditions. Matured grapevines of ‘Pusa Navrang’ grapes were treated
with two elicitors (methyl jasmonate, MeJA and benzothiadiazole, BTH) at three
different stages (veraison, 3 days after veraison and 6 days after veraison). Various
treatment combinations were studied on various parameters including vine
physiological activities, leaf nutrient content, berry-bunch morpho-physico parameters
and biochemical parameters (TSS, titratable acidity, ascorbic acid, total phenolics, total
flavonoids, anthocyanins and total antioxidant capacities) of treated berries.
Application of these elicitors was found very useful for improving various nutraceutical
properties of the ‘Pusa Navrang’ grapes.
Preharvest application of methyl jasmonate (MeJA) affected majority of the
berry biochemical traits applied at veraison stage. Physiological parameters were found
least affected irrespective of the concentrations as well as time of application. Leaf
nutrient content showed a negative relationship with the 15 mM concentration with
respect to the accumulation of macro as well as micro nutrients of leaves. Total soluble
solid, titratable acidity, pH and ascorbic acid along with the morpho-physical properties
of grape were also least affected irrespective of dose and time of application. Higher
concentration of methyl jasmonate (10 mM and 15 mM) elicited the rate of
accumulation of total phenolics, total flavonoids, total monomeric anthocyanins and
antioxidant capacities estimated by DPPH, FRAP and CUPRAC assay. Elicitor,
benzothiadiazole (BTH) was also found very effective in improving the majority of
nutraceutical properties of the grape berries. Application of 0.4 mM BTH at veraison
as well as 3 days after veraison improved the berry phenolics, flavonoids, total
monomeric anthocyanins and antioxidant power. However, it was not found effective
against elicitation of ascorbic acid, TSS, berry firmness, pH, physiological and leaf
nutrient content. The positive effect of both methyl jasmonate and benzothiadiazole
indicated that these treatments could be useful for enhancing the grape phenolics,
flavonoids, anthocyanins and antioxidant properties.
Key words :- elicitor, methyl jasmonate, benzothiadiazole, anthocyanin, phenolics
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T-10269
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