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.
Highlights
In a market where consumers expect products of high quality throughout the year, maintenance and improvement of fruit quality at postharvest are becoming increasingly important [1]
Cold storage was efficient at reducing gray mold of ‘BRS Isis’ seedless grapes for a period of 50 days, even when grapes were inoculated; we observed no differences among treatments (Table 3)
These include bunch dehydration,skin skincolor colorchanges, changes,accelerated acceleratedsoftening, softening,and andmicrobiological microbiologicaldamage, damage,especially especiallygray gray browning), mold decay caused by table grapes for export must be resistant to cold mold decay caused by B. cinerea [37]
Summary
In a market where consumers expect products of high quality throughout the year, maintenance and improvement of fruit quality at postharvest are becoming increasingly important [1]. ‘BRS Isis’, a novel hybrid seedless table grape cultivar released in 2013, has large red berries and a crunchy texture. This grape was obtained by crossing CNPUV 681-29 [Arkansas 1976 × CNPUV. 147-3 (‘White Niagara’ × ‘Venus’)] × ‘BRS Linda’ It is recommended for cultivation in tropical and subtropical areas, with excellent horticultural performance, high bud fecundity and tolerance to downy mildew (Plasmopara viticola), the most important disease affecting grapevines in subtropical humid conditions [5,6]. Low temperature storage is one of the most commonly used methods to prolong postharvest quality and extend the shelf-life of a broad range of horticultural commodities
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