Preharvest Applications of Alginate, Salicylic Acid and Oxalic Acid Have a Synergistic Effect on Quality and Storability of Red Globe Grape Variety (Vitis vinifera L.)

Abstract

This study aimed to evaluate the synergistic effect of preharvest spraying with alginate and in combination with salicylic acid (SA) and oxalic acid (OA), on the quality parameters and storage life of ‘Red Globe’ grape variety at 0-1°C with 85-90% relative humidity for 60 days. Data of physical and chemical quality parameters were taken at 15-day intervals. The results have shown that alginate coatings delayed changes in weight loss, firmness and berry color compared to control. Grapes coated alginate enriched with oxalic acid and salicylic acid proved to the most effective applications in restricting stem browning and decay incidence. Moreover, these formulations improved the content of phenolic compounds, contributing to the high antioxidant potential of coated grapes. These findings reveal that preharvest sprayed clusters with alginate combined with SA and OA applications may have high potential for improving storage quality of commercial grape.