Abstract
The main problems of grape storage are berry dehydration and rot. One of the solutions to reduce rot and preserve the quality of grapes during storage is the use of aerosol treatment with calcium content before storing. The aim of the study was to evaluate the effect of physiologically active substances based on calcium in various concentrations on the quality and organoleptic characteristics of table grape cvs. ‘Italia’ during long-term storage. The effectiveness of the studied systems of treatment was evaluated according to the content of sugars and titratable acids, the activity of the redox enzymes of polyphenol oxidase and peroxidase, weight loss of bunch and organoleptic properties. The greatest effectiveness established by using preparation of Master Green Ca, Brentax KCa, and Brentax Ca (in concentration 150g / 20l). Experimental treatments significantly decreased the weight loss of bunch (less than 4%), and preserved organoleptic properties of berry at a high level (8.2-8.9 points). Decrease in the activity of oxidative enzymes had a positive effect on the quality of table grapes and contributed to its better preservation. The data obtained make it possible to rationalize the system of long-term storage of grapes by using of aerosol treatment with calcium-based preparation.
Highlights
The main problems of grape storage are berry dehydration and rot
The main losses of table grapes when using the storage technology are due to the weight loss of bunch
It is noted that the minimum values of the weight loss of bunch were observed for grape samples using experimental treatment schemes with preparations Master Green calcium-based bioactivator (Ca), Brentax KCa, and Brentax Ca
Summary
The main problems of grape storage are berry dehydration and rot These phenomena can be reduced by technological approaches that help to inhibit respiration processes, as a result of which metabolic activity decreases and the organoleptic properties of grapes are preserved. One of these technological approaches is the use of various growth regulators in aerosol treatment in the post-harvesting period [1, 2, 3, 4]. The main technologies for maintaining product quality during storage are aimed at inhibiting physiological processes, in particular, excessive accumulation of ethylene and its biological action [5, 6, 7] Another alternative is the use of nonorganic salts for plants, in particular with calcium content. The use of physiologically active calcium-based substances reduces the risk of the pathogen entry into plant tissues, stimulates defense mechanisms [11, 12]
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