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ThesisItem Restricted Post harvest treatments for enhancing storage life of guava cv. Shweta(Punjab Agricultural University, Ludhiana-, 2020) Dhillon, Amanpal Singh; Brar, J. S.The guava (Psidium guajava L.) is highly perishable fruit and to extend post harvest life and fresh fruit market, the present investigations were carried out to explore the potential of guava storage under cold and ambient conditions using wax coatings and LDPE packing. Physiological mature fruits were subjected to treatments of beeswax (2.5% and 5.0%) and carnauba wax (3.0% and 6.0%) alone and in combination with LDPE packing. Treated fruits were placed in CFB boxes and stored under cold (6-8oC temperature and 90-95 % RH) as well as at ambient conditions for 25 and 15 days, respectively. The fruits were analyzed for various physiological and biochemical parameters at 3 and 5 days interval under ambient and cold conditions, respectively. All the treatments exhibited potential to maintain the post harvest life of fruits as compared to untreated fruits under both the storage conditions. However, the fruits coated with beeswax 5% + LDPE packing maintained the fruit firmness, reduced the physiological loss in fruit weight and fruit spoilage significantly. The pectin methyletrase (PME) activity was also restricted significantly with the same treatment. The quality parameters such as TSS, acidity, total phenols, pectin content and palatability rating was also highest in the treatment of beeswax 5% + LDPE packing. While, the carnauba wax 6% + LDPE also proved equally effective in maintaining higher level of total and reducing sugars under cold storage conditions. Beeswax 5 % + LDPE packing sustained the fruit quality for 20 and 9 days as compared to 5 and 3 days under cold and ambient storage in untreated fruits, respectively.
