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Postharvest ripening and respiration of chili
(University Of Ruhuna, 2004) Chaturani, G. D. G; Wilson, S; Perera, S. V. T; Hettiarachchi, M. P
Effect o f exogenous ethylene application on postharvest ripening and respiratory pattern o f chilli (Capsicum annum Var.MI-2) harvested at different stages o f maturity was examined. Chillies harvested at mature green and colour break stages were used fo r the ripening study. Pods were allowed to ripen at ambient conditions (32 ± 2 °C and 37% RH) with 0, 100, 200, 300, and 400ppm ethylene concentrations. Observations were made on colour development and weight o f red ripe pods during storage period. Ethylene treatment had no significant effect on colour development o f chilli harvested at both stages o f maturity. Fruits harvested at different stages o f maturity ranging from light green to fu ll red were usedfor the respiration study at 12.2 °C and 83 % RH in a closed system. Respiration rates o f chilli from light green to fu ll red stage ranged between 12.7-24.2 mgCO/kg/h. The rate o f respiration was low at light green stage and increased with maturity reaching a peak (24.2 mgCO/kg/h) at colour break stage. Respiration rate decreased with fru it ripening and increased with development o f full red colour. The internal ethylene concentration o f pods was ranged between 3.2-4.3 ppm. However, there was no ethylene peak observed with the maturity.
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The effect of different ethylene concentrations on different maturity stages on the postharvest quality of Cavendish banana (Musa acuminate) cultivar, ‘Grande Naine’
(Faculty of Humanities and Sciences,SLIIT, 2021-09-25) Subasinghe, S. M. J. C; Kodithuwakkuge, V. N; Attanayake, U; Wasala, W. M. C. B; Dammullage, I; Beneragama, C. K
Banana is one of the most cultivated fruit crops in Sri Lanka and 5% of total production is exported. Due to a lack of knowledge on harvesting maturity, artificial ripening and other postharvest technologies, 20% of the yield is lost during the post-harvest handling of banana. This study was conducted to examine the effect of application of different ethylene concentrations at different maturity stages on postharvest quality of Cavendish banana (Musa acuminate) cultivar ‘Grande Naine’ under tropical climate conditions. Mature bananas combs (hands) at twelve weeks, thirteen weeks and fourteen weeks after flowering were exposed to 0, 85 and 170 ppb of ethylene gas for 24 hours at 24 ˚C and under 75% RH. Different physicochemical properties were obtained and analyzed statistically. There was a significant interaction effect between the maturity stage and ethylene concentration on weight loss, TSS and pH at the table-ripe stage. The fruits lost weight steadily down to 8.5%, possibly because of the rapid rates of metabolism as well as water loss. Meanwhile, TSS increased from 4% to 20% and pH decreased gradually with the ripening of banana. The results revealed that the best stage of maturity for harvesting Cavendish bananas is at 11-12 weeks after flowering for improved physicochemical and sensory properties at the table ripe stage. Further, it can be concluded that the use of ethylene concentration of 85 ppb for ripening Cavendish banana instead of the higher concentrations that are commercially applied, would be cost-effective without decreasing the fruit quality.

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