Jawandha, S.K.Rana, Manju2019-11-122019-11-122019http://krishikosh.egranth.ac.in/handle/1/5810135100The aim of present investigation entitled “Effect of pre-harvest application of antioxidants on storage life and quality of plum (Prunus salicina Lindl.) cv. Satluj Purple” was to extend the post-harvest life and maintenance of quality of plum fruits under cold storage conditions. The research was conducted in Department of Fruit Science, Punjab Agricultural University, Ludhiana. The healthy plum trees were sprayed with sodium nitroprusside (SNP) @ 50, 100 and 150 μmolL-1 and salicylic acid (SA) @ 1, 2 and 3 mmolL-1 before 7 and 14 days of harvest. The fruits were harvested at colour break stage, packed in corrugated fibre board (CFB) boxes and stored at low temperature (0-1ºC and 90-95% RH).The various physicochemical observations were recorded after 7, 14, 21, 28 and 35 days of storage. The results revealed that the fruits treated with 100 μmolL-1 sodium nitroprusside (SNP) and 150 μmolL-1 sodium nitroprusside (SNP) 14 days before harvest effectively prolonged the storage life of fruits by minimizing the physiological loss in weight, spoilage, the actitvities of fruit softening enzymes (pectin methyl esterase and cellulase) and maintaining higher firmness, sensory quality, all sugars (total sugars, reducing sugars and non-reducing sugars), titratable acidity, total soluble solids (TSS), total antioxidant activity, total phenols and flavonols content under low temperature storage conditions.ennullThesis