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The Role of Preharvest Polyamines Application on the Post-harvest Quality and Shelf Life of Tomato Fruit
Abstract:
The role of pre-harvest polyamines application on the post-harvest quality and shelf life of tomato fruit was investigated. In the first experiment, tomato fruits (cultivar Intan) were sprayed with 0 (control), 0.1 and 1 mM putrescine, spermidine, and spermine, respectively, 28 days after anthesis (mature-green stage). In the second experiment, the selected polyamine from the first experiment (1 mM spermidine) was applied to tomato fruits, cultivars Intan, Mitra, and Pointed, on immature-green (18 days after anthesis) and mature-green (25 days after anthesis) stages. On breaker stage, the fruits were harvested and stored at room temperature (26-28ºC). Color development, weight loss, firmness, total soluble solid (TSS), titratable acidity (TA), and respiration rate were determined periodically throughout the storage period.
Various polyamines did not inhibit ripening, except treatment of 1 mM spermidine appeared to inhibit weight loss and TSS. Tomato fruits cultivar Pointed ripened more slowly (3-6 days) than cultivars Mitra and Intan, and had prolonged keeping qualities as shown by the inhibition in peel color index development and in softening.
Polyamine (1 mM spermidine) delayed ripening and senescence. Application of spermidine on immature-green and mature-green stages retarded peel color change, fruit softening, weight loss, TSS, and respiration rate compared with control. Application on immature-green stage was not significantly different from the application on mature-green stage. Spermidine application into tomatoes prolonged the delay in ripening (6 days) compared with control.