Reduced chilling injury in mango fruit by 2,4-dichlorophenoxyacetic acid and the antioxidant response

• Published in: Postharvest biology and technology Vol. 48; no. 2; pp. 172 - 181
• Main Authors: Wang, Baogang, Wang, Jianhui, Liang, Hao, Yi, Jianyong, Zhang, Jingjing, Lin, Lin, Wu, Yu, Feng, Xiaoyuan, Cao, Jiankang, Jiang, Weibo
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier B.V 01.05.2008; Amsterdam; New York: Elsevier; Elsevier Science
• Subjects: 2,4-D; abscisic acid; antioxidant activity; Antioxidant enzymes; ascorbate peroxidase; Biological and medical sciences; catalase; chemical treatment; Chilling injury; chlorophyll; cold storage; Endogenous hormones; firmness; Food industries; Fruit and vegetable industries; fruit composition; fruit quality; Fundamental and applied biological sciences. Psychology; gibberellic acid; glutathione reductase (NADPH); hydrogen peroxide; indole acetic acid; Mango; mangoes; postharvest diseases; Quality; shelf life; soluble solids; storage time; sugar content; superoxide dismutase; zeatin; zeatin riboside; Mango; Endogenous hormones; 2,4-D; Antioxidant enzymes; Quality; Chilling injury; Hormone; Endogenous; Fruit; Enzyme; Antioxidant; Cold induced disorder
• ISSN: 0925-5214; 1873-2356
• DOI: 10.1016/j.postharvbio.2007.10.005

The aim of this study was to evaluate the effects of 2,4-dichlorophenoxyacetic acid (2,4-D) on chilling injury (CI) in mango fruit. 2,4-D treatment at 150 mg L −1 could significantly alleviate CI or disease incidence of mango fruit during 7 days storage at 4 °C and an additional 14 days at 20 °C ( P < 0.05). Fruit quality, including increased soluble solids, soluble sugar, fruit firmness, and peel chlorophyll level, was strongly improved by 2,4-D treatment. These results indicate that 2,4-D could be used as an effective method to preserve the postharvest life of mango fruit. Endogenous H 2O 2 levels in the fruit were increased by 2,4-D treatment and decreased by exogenous H 2O 2 treatment. The activities of catalase, superoxide dismutase, ascorbate peroxidase (APX) and glutathione reductase (GR) in the 2,4-D-treated fruit were much higher than those in control fruit. However, exogenous H 2O 2-treated fruit showed higher CI and lower activities of APX and GR. In addition, the results showed that 2,4-D treatment could significantly enhance levels of the endogenous ABA and GA 3, and reduce IAA and zeatin riboside levels in the fruit. These results suggest that 2,4-D could regulate chilling resistance by changing the balance of endogenous hormones levels.