امیر وزیری زاده

The main goal of this research was studying the effect of calcium chloride, putrescine, 1- methylcyclopropane and chitosan treatments on the storage life, quality and controlling postharvest fungal decay of pomegranate. This investigation was carried out in 2015 in two part the laboratory in a factorial randomized complete block design with 52 treatment and three replications.Thefirst part include dipping three concentrations 0, 1 and 2% of CaCl2, putrescine for four concentrations 0, 1, 2 and 3 mmol.L, 1-methyl cyclopropane with three concentrations 0, 1and 2µl/l and chitosan with three concentrations 0, 0.5 and 1 % each for four minutes. After applying chemical treatments, fruits were stored for 120 day at a temperature of 4 ?C and 75± 5% RH. The physicochemical analysis of this section such as weight loss, percentage of infected fruites, juice percent, titratable acidity, total soluble solids, pH juice, vitamin C, anthocyanin and carotenoid were evaluated at an interval of 30 days. The second part of the study was done after storage stage and consisted of culturing pieces of infected fruit onto Potato-Dextrose-Agar (PDA) medium, purification, and characterization of fungus genus isolated from most of the fruits. After treatment of fruits (treatment performed similarly to the first part), to measure the development of fungal decay caused by the treatments, fruits were inoculated by fungus. The percentage of fruit decay was estimated weekly for five weeks. Statistical analysis showed that storage intervals and treatments have significant retention effects on the quality parameters and control decay fungi of the pomegranate fruits during cold storage. A significant decrease was observed in ascorbic acid content, total acid and total soluble solid while a significant increase was observed in decay index, pH and % weight loss during cold storage. The results showed that the lowest percentage weight loss and infected fruits, highest percentage of fruit juice and anthoc