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首页> 外文期刊>Acta Horticulturae >Postharvest treatment effects on 'B74' mango fruit lenticei discolouration after irradiation
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Postharvest treatment effects on 'B74' mango fruit lenticei discolouration after irradiation

机译：采后处理对辐照后'B74'芒果果实扁豆变色的影响

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摘要

Lenticel discolouration (LD) is a common disorder of mango fruit around the world. It results in poor appearance and disappointment of consumers. LD is exacerbated by treatment of mango fruit with gamma irradiation for insect disinfestation. The issueis problematic on the relatively new mango cultivar B74' and may represent an oxidative browning process. With a view to reducing irradiation-induced LD on 'B74', postharvest wax (one and three layers; 75% carnauba wax) and antioxidant (100 mM ascorbicacid, 100 mM calcium chloride, 10, 50 and 100 mM calcium ascorbate) dip treatments were investigated. Treatment of green mature fruit with three layers of wax prior to exposure to 557 Gy gamma irradiation reduced LD by 40% relative to the non-waxed control. However, the fruit failed to ripen properly as evidenced by delayed skin colour change, retarded softening and increased skin browning as compared to the controls and fruit coated with one layer of wax. Treatment with one layer of wax did not reduceLD. Mechanistically, the responses suggest that air exchange plays a pivotal role in LD. A lowered oxygen concentration in the lenticels may reduce the disorder after irradiation treatment. Postharvest treatments with the various antioxidants failed to reduce LD. Rather, all antioxidant treatments at the test concentrations, except calcium chloride, significantly increased skin browning.
机译：扁豆变色（LD）是全世界芒果果实的常见病。这导致外观差和消费者失望。通过用γ射线辐照芒果果实以杀灭昆虫来加剧LD的病情。该问题在相对较新的芒果品种B74'上是有问题的，并且可能代表了氧化褐变过程。为了减少'B74'的辐射诱导LD，采后蜡（一层和三层; 75％巴西棕榈蜡）和抗氧化剂（100 mM抗坏血酸，100 mM氯化钙，10、50和100 mM抗坏血酸钙）浸泡处理被调查了。相对于非蜡质对照，在暴露于557 Gyγ射线之前用三层蜡处理绿色成熟水果可将LD降低40％。然而，与对照和涂有一层蜡的水果相比，该水果未能适当地成熟，如延迟的皮肤颜色变化，延迟的软化和增加的皮肤褐变所证明。用一层蜡处理不会降低LD。从机械上讲，这些响应表明空气交换在LD中起着关键作用。皮膜中较低的氧浓度可以减少辐射治疗后的疾病。采后用各种抗氧化剂进行的处理均无法降低LD。相反，在测试浓度下，所有抗氧化剂处理（氯化钙除外）都会显着增加皮肤褐变。

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