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Effects of exogenous 24-epibrassinolide treatment on postharvest quality and resistance of Satsuma mandarin (Citrus unshiu)

文献类型： 外文期刊

作者： Zhu, Feng 1 ; Yun, Ze 1 ; Ma, Qiaoli 1 ; Gong, Qi 1 ; Zeng, Yunliu 1 ; Xu, Juan 1 ; Cheng, Yunjiang 1 ; Deng, Xiuxin 1 ;

作者机构： 1.Huazhong Agr Univ, Key Lab Hort Plant Biol, Minist Educ, Wuhan 430070, Hubei, Peoples R China

2.Chinese Acad Sci, South China Bot Garden, Guangzhou 510650, Guangdong, Peoples R China

3.Yunnan Acad Agr Sci, Inst Trop & Subtrop Cash Crops, Baoshan 678000, Yunnan, Peoples R China

关键词： Fruit storage;Brassinosteroid;H2O2;Citrus fruit;Fruit quality;Rot control

期刊名称：POSTHARVEST BIOLOGY AND TECHNOLOGY （ 影响因子：5.537； 五年影响因子：5.821 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： To elucidate the effects of exogenous brassinosteroids (BRs) treatment on the postharvest behavior of citrus fruit, Satsuma mandarin (Citrus unshiu) fruit were treated with 5 mg L-1 24-epibrassinolide (EBR) and stored at 12-16 degrees C with a relative humidity of 90-95%. After 50 d treatment, the disease incidence of the control and EBR-treated fruit was 18.7% and 4%, respectively, suggesting that EBR treatment can significantly enhance the postharvest biotic stress tolerance of Satsuma mandarins. Moreover, the fruit quality analysis revealed that EBR treatment induced a rapid weight loss during the first 6 d after treatment, which was similar to the effect of a conditioning treatment, while it exhibited no negative effects on inner quality. Further, we measured the contents of hydrogen peroxide (H2O2) and the primary metabolites as well as the expression of the stress-related genes in the fruit pericarp. The results indicated that H2O2 content was significantly increased by EBR treatment. In addition, analyses on the primary metabolites showed that some stress-related metabolites, such as ornithine, proline, GABA, D-xylose and D-galactose, were increased in the EBR-treated fruit. Expression of the stress-related genes was markedly up-regulated in EBR-treated fruit. These results suggest that the effects of EBR on reducing the postharvest disease incidence of citrus fruit may be associated with the accumulation of H2O2 and stress-related metabolites and the induction of stress-related genes. (C) 2014 Elsevier B.V. All rights reserved.

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