Abstract
The purpose of this research was to study the control of physiological damages in late peach cultivars during cold storage. The research was carried out over the course of two years (2003 and 2004), using yellow pulp peaches ('Flordagrande', 'Maciel' and 'Peach') and white pulp peaches ('Chimarrita', 'Marli' and 'Chiripa'). All the fruits were exposed to temperatures of 20°C and 75±3% of U.R., in a B.O.D., for 0, 24 and 48h. The fruits were then kept in a cold chamber at 0±0.5°C and 92±3% of R.H., for 28 d. The analyses, done from 4 to 6h after the removal of the fruits from the cold chamber, were conducted at harvest time (day 1 - initial stage), after one day of delayed storage, and at 7, 14, 21 and 28 d as well as two days after each one of these days (7+2, 14+2, 21+2 and 28+2 d). The yellow pulp cultivars, regardless of delayed storage, did not present any wooliness or leatheriness. The white pulp fruits, not submitted to delayed storage, developed either one or the other physiologic disturbances. Due to their low level of pulp firmness, control 'Chimarrita' and 'Marli' peaches, were classified as wooly. Control 'Chiripa' peaches, with firmness over 30 N, presented leathery skin. High pectinmethylesterase enzymatic activity was verified in those fruits with woolliness. polygalacturonase activity was similar in both wooly and normal maturing fruits. Regarding the fruits which were found to be leathery, they had a high pectinmethylesterase enzyme activity and a low polygalacturonase enzyme activity as compared to wooly and/or normal fruits. Delayed storage for 48h, in all cultivars provided advanced ripening. Delayed storage for 24h was effective in the control of woolliness and firmness retention (leatheriness) of white pulp cultivars.
Published Version
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