Improvement of Cold Storage Conditions of Garden Plum (Prunus Domestica) by Application of Ascorbic Acid, Salicylic Acid and Methyl Jasmonate
Plums were harvested in the middle summer in eastern part of Georgia. After harvesting average samples of fruits
were treated with combined water solution (CS) of ascorbic acid (0.5%), salicylic acid (0.03%) and methyl jasmonate
(0.02%). Data showed that treatment with CS caused significant retention of polyphenols degradation process during storage
period. Four main anthocyanins were identified in plum fruits: Cyanidin-3-O-glucoside, Cyanidin-3-O-rutinoside, Peonidin-
3-O-rutinoside and Peonidin-3-O-glucoside. Anthocyanins amount in fresh fruits was 68.29±3.41 mg 100g-1. After 22 days
storage their content degraded down to 24.54±1.22 mg 100g-1and 48.58±2.42 mg 100g-1in the control and treated samples
respectively. Antioxidant activity of fresh plum fruits was equal to 345.20±17.26 mg equivalents of vitamin-C per 100 g of
fruits. During storage this value decreased to 228.29±11.41 and 270.58±1 mg equivalents of vitamin-C per 100 g of fruits for
control and treated samples respectively. After 22 days storage period TSS of fruits decreased from 13.71±0.68% to
11.23±0.56% in control samples and to 12.56±0.62% in treated samples probably because of respiration process. Difference
between the treated and untreated samples after 22 days was statistically significant (p<0.05).
Keywords - Plum, biochemical compounds, storage.