The study and comparison of storage life of different grape varieties

The quality of fruits decrease after harvest due to the release of ethylene, water lost and other internal factors. Attempts for reducing postharvest losses has led to introduce of various packagings, this study was carried out to compare and evaluate the storage life of five grape varieties including: "Bidaneh Sefide", "Bidaneh Ghermeze", "Lal", "Sahebi" and "Fakhri". In this experiment, disposable containers, non-packaging, washing before storage and no washing were used as treatments. Respiration rate, fruit juice, soluble solids, organic acids, pH, anthocyanin content, storage life, shrinkage, browning and decay index and water loss were evaluated. According to the results, "Bidaneh Ghermeze" packed in disposable showed the longest of storage life. This treatment with the lowest respiration rate (0.03 mgCO2/kg.hr), browning index, shrinkage, decay index and water loss with 3, 5, 0 and 9 %, respectively showed higher storage life compared to other treatments. "Sahabi" fruits with the highest respiration rate (0.16 mgCO2/kg.hr) and deterioration and %60 shrinkage had the lowest storage life in washing treatment before storage. This treatment had the lowest market ability and anthocyanin content. Based on the results of this research, "Bidaneh Ghermeze" and "Fakhri" cultivars showed better storage life compared to the other cultivars and washing before storage or using of disposable packs are not sufficient to decrease grape post harvest losses.