Fruit of banana (Musa spp., AAA group, cv. ‘Brazil’) were harvested at 80–90% maturity from a commercial orchard in Guangzhou and then cut into fingers. Fruit fingers were dipped in water to clean the surfaces. They were then air-dried until visible moisture on fruit surfaces disappeared completely. The fruit were selected for uniformity of weight and shape and for lack of visual defects. In a small-scale experiment, the optimum concentration of oxalic acid that affected postharvest ripening of banana fruit was assessed. Oxalic acid at 0 (control), 5, 10 or 20 mM was applied to evaluate the green life of harvested banana fruit at room temperature (23 ± 2 °C). During storage, the simple green life was evaluated rapidly based on the changes in fruit firmness and skin color. Results showed that immersion into 20 mM oxalic acid for 10 min was the best (supplementary Fig. 1) in terms of the lowest changes in fruit firmness (softening) (supplementary Fig. 2) and skin color (supplementary Fig. 3 Fig. 3). Thus, this treatment was used for further experiments.
Fruit of banana (Musa spp., AAA group, cv. ‘Brazil’) were harvested at 80–90% maturity from a commercial orchard in Guangzhou and then cut into fingers. Fruit fingers were dipped in water to clean the surfaces. They were then air-dried until visible moisture on fruit surfaces disappeared completely. The fruit were selected for uniformity of weight and shape and for lack of visual defects. In a small-scale experiment, the optimum concentration of oxalic acid that affected postharvest ripening of banana fruit was assessed. Oxalic acid at 0 (control), 5, 10 or 20 mM was applied to evaluate the green life of harvested banana fruit at room temperature (23 ± 2 °C). During storage, the simple green life was evaluated rapidly based on the changes in fruit firmness and skin color. Results showed that immersion into 20 mM oxalic acid for 10 min was the best (supplementary Fig. 1) in terms of the lowest changes in fruit firmness (softening) (supplementary Fig. 2) and skin color (supplementary Fig. 3 Fig. 3). Thus, this treatment was used for further experiments.
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