• Lovepreet
• Amarjeet Kaur

Plum is a perishable fruit which deteriorates rapidly after harvesting thus, having a very short storage life. However, owing to its greater demand in the market, there is a need to increase its shelf life. Hence, a research study was conducted at Horticulture Laboratory, P.G. Department of Agriculture during 2023-24 with an aim to evaluate the effect of putrescine and salicylic acid on quality attributes of plum during cold storage. The plum fruits (cv. ‘Satluj Purple) procured at the mature ripened stage were dipped in various concentrations of putrescine (1, 2 and 3 mM/L) and salicylic acid (0.5, 1 and 1.5 mM/L) along with distilled water (control) for 5 minutes. Then the treated fruits were packed in CFB boxes and stored at 4°C with 95 % relative humidity for 30 days. Experiment was carried out in completely randomized block design replicated thrice. The physico- biochemical fruit traits were assessed at 0, 5, 10, 15, 20, 25 and 30 days of storage intervals. The results revealed that during the entire storage period, the weight loss, TSS and pH increased significantly whereas, the fruit firmness, titratable acidity, ascorbic acid, total phenolics, carotenoids and chlorophyll content decreased significantly (P ≤0.05) in all the treatments. The research outcomes showed that an exogenous treatment of putrescine and salicylic acid resulted in the retention of weight loss and fruit softening. Also they maintained titratable acidity, ascorbic acid, total phenols, carotenoids and chlorophyll activity in plum fruits during storage. The research study concluded that the application of both putrescine and salicylic acid proved effective in delaying the ripening processes and prevented senescence. Therefore it can be employed to prolong the fruit shelf life commercially with acceptable fruit quality in plum.

Keywords: CFB Boxes, Cold storage, Plum, Quality attributes, Shelf life, Total phenolics

"Postharvest PGR's treatment to improve the storability of plum cv. Satluj Purple ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 2, page no.h404-h411, March-2025, Available :http://www.jetir.org/papers/JETIR2502753.pdf

"Postharvest PGR's treatment to improve the storability of plum cv. Satluj Purple ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 2, page no. pph404-h411, March-2025, Available at : http://www.jetir.org/papers/JETIR2502753.pdf