Studies on post-harvest behaviour of peach (Prunus persica L. Batsch) under low temperature storage conditions
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Date
2022
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Punjab Agricultural University
Abstract
The present investigation entitled ‘Studies on post-harvest behaviour of peach (Prunus persica L. Batsch) under low temperature storage conditions’ was conducted in the Department of Fruit Science, Punjab Agricultural University, Ludhiana during the year 2019 and 2020. In experiment-I, physiological mature and uniform fruits of peach cultivars ‘Flordacrest’, ‘Valley Grande’, ‘Flordagrande’, ‘Tropic Beauty’, ‘Partap’, ‘Early Grande’, ‘Flordaglo’, ‘Tropic Snow’, ‘Tropic Sweet’, ‘Parbhat’, ‘Flordaprince’, ‘Punjab Nectarine’ and ‘Suncoast’ were packed separately in CFB (corrugated fiber board) boxes and stored at 0-1ºC and 90-95% relative humidity for 40 days. In experiment -II, physiological mature and uniform fruits of peach cultivar ‘Shan-i-Punjab’ were dipped in aqueous solutions of sodium nitroprusside (0.50 mM, 1.0 mM & 2.0mM), salicylic acid (0.5 mM, 1.0 mM & 2.0 mM) and ascorbic acid (0.5 mM, 1.0mM & 2.0 mM) for 5min and control fruits dipped in water only. Peach fruits under various treatments were packed separately in CFB boxes and stored at 0-1ºC and 90-95% relative humidity for 40 days. In experiment -III, physiological mature and uniform fruits of peach cultivar ‘Shan-i-Punjab’ were coated with different edible surface coatings of beeswax (0.50 %, 1.0 % & 2.0 %), chitosan (0.25 %, 0.50% & 1.0%) and sodium alginate (0.50 %, 1.0 % & 2.0 %) and control fruits were kept uncoated . These coated and uncoated peach fruits were shade dried and packed separately in CFB boxes and stored at 0-1ºC and 90-95% relative humidity for 40 days. Both treated and untreated cold stored peach fruits of all these three experiments were analyzed for different physico-chemical attributes and enzymatic assays on 0,10th, 20th, 30th and 40th day of storage. Results revealed that fruits of peach cultivar ‘Flordacrest’ registered longer postharvest life with acceptable fruit quality upto 30 days under low temperature storage conditions. Peach fruits cultivar ‘Shan-i-Punjab’ treated with sodium nitroprusside 1.0 mM (experiment-II) and beeswax 2.0%(experiment-III) coating delayed the ripening process and preserved the fruit quality attributes up to 30 days of cold storage period. Fruits from these both treatments registered the lowest weight loss, spoilage and retained higher fruit firmness, sensory quality, total soluble solids, sugars, titratable acidity, vitamin C, total carotenoids, total phenolics content and total antioxidant activity under low temperature storage conditions. Alongwith this, these treatments (sodium nitroprusside 1.0 mM ; beeswax 2.0% coating) to peach cultivar ‘Shan-i-Punjab’ fruits also delayed the polyphenol oxidase, pectin methylesterase, polygalacturonase & cellulase enzyme activities during cold storage period.
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Sukhjit Kaur (2022). Studies on post-harvest behaviour of peach (Prunus persica L. Batsch) under low temperature storage conditions (Unpublished Ph.D. Dissertation). Punjab Agricultural University, Ludhiana, Punjab, India.