Cold Storage and Biocontrol Agents to Extend the Storage Period of ‘BRS Isis’ Seedless Table Grapes

Abstract

'BRS Isis' is a novel hybrid seedless table grape with large reddish bunches. This cultivar is cultivated in tropical and subtropical areas and has potential to be exported overseas; however, under these growth conditions, grapes can be severely damaged by gray mold (Botrytis cinerea), the main postharvest disease of table grapes. Thus, this study aimed to evaluate different pre-and postharvest strategies to extend the storage period of 'BRS Isis' seedless table grapes. The treatments consisted of grapes packed into carton boxes under cold storage (1 • C and high relative humidity), pre-and/or postharvest treatment with potassium bicarbonate or a biological control agent (Bacillus subtilis), all with Botrytis inoculation. Additionally, two controls, with and without Botrytis inoculation, were also evaluated. The experimental design was completely randomized with eight treatments and three replications, and each plot consisted of four bunches. After a 50-day cold storage period, the carton boxes were kept for five days at room temperature (22 • C). Gray mold incidence and water loss, as well as soluble solids (SS), pH, titratable acidity (TA), SS/TA ratio, and color attributes were evaluated during both periods. Cold storage effectively reduced gray mold in 'BRS Isis' seedless grape for a period of 50 days, even when grapes were inoculated; however, no difference among treatments was observed. Higher water loss was observed in both non-treated control treatments.

Postharvest Losses in Quantity and Quality of Table Grape (cv. Crimson Seedless) along the Supply Chain and Associated Economic, Environmental and Resource Impacts

“…Supply chain scenario C (to export retail markets) No significant difference in any of the color attributes were found in 2017, similar to findings of [57] for cv. 'BRS Isis' after 50 days in cold storage plus 5 days under ambient conditions.…”

Improving Fruit Quality and Prolonging Postharvest Life of Superior Grapevine during Cold Storage

“…On average, two weeks of storage yields grapes of higher quality than three weeks of storage. Even when the grapes were inoculated, Colombo et al, (2018) reported that cold storage significantly reduced grey mould in seedless grapes 'BRS Isis' for 50 days; nonetheless, no difference was noticed between the treatments. In both untreated control treatments, more water was lost.…”

“…Additionally, TSS of the fruits rose during storage, primarily as a result of glycogenesis and metabolism of fruiting tissues that became partially inactive as a result of changes in glucose and fructose levels. According to Colombo et al (2018), the carton boxes were kept for five days at room temperature (22 oC) after a 50-day period of cold storage. Water loss and the occurrence of grey mould were evaluated at both periods, along with soluble solids (SS), pH, titratable acidity (TA), SS/TA ratio, and colour traits.…”

SO2-Generating Pads and Packaging Materials for Postharvest Conservation of Table Grapes: A Review

“…Control of B. cinerea is a difficult task, as pre-harvest fungicide applications a always effective in preventing and controlling an infection during cold storage [31] the fungus can survive in less favorable conditions for long periods and due to the gence of fungicide-resistant isolates [30,32]. In addition, many countries do not allo treatment of fruit after harvesting with synthetic fungicides, and few active ingred are allowed against postharvest diseases, making their control even more difficult [3 Therefore, efforts to minimize gray mold are extremely important in all stages o development and especially in the harvest and post-harvest stages, requiring the s for alternative measures [35,36].…”