Effect of 24-epibrassinolide on chilling injury of peach fruit in relation to phenolic and proline metabolisms

文献类型： 外文期刊

第一作者： Gao, Hui

作者： Gao, Hui;Lv, XinGang;Cheng, Ni;Cao, Wei;Zhang, ZhengKe;Peng, BangZhu

作者机构：

关键词： Peach fruit;Chilling injury;Brassinosteroids;Phenolic metabolism;Proline metabolism

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： Peach fruit is cold-sensitive and vulnerable to chilling injury (CI) during cold storage, which limits its edible and market value. Brassinosteroids (BRs) have been used to alleviate CI of fruit; however, the effect of BRs on CI of peach fruit remains unknown. In this study, peach fruit were immersed in a 15 mu M 24-epibrassinolide (EBR) solution for 10 min at 25 degrees C and then stored at 1 degrees C for 4 weeks and subsequently transferred to 25 degrees C for 3 d to investigate the effects and possible mechanisms of EBR on CI in peach fruit. EBR treatment effectively inhibited the loss of firmness and delayed the increase of CI index and levels of malondialdehyde, superoxide anion production, and hydrogen peroxide in peach fruit. EBR treatment significantly increased shikimate dehydrogenase, phenylalanine ammonia lyase, cinnamate-4-hydroxylase and 4-coumarate: coenzyme A ligase activity, but reduced polyphenol oxidase and peroxidase activity, which resulted in a higher total phenolic content that might contribute to inhibition of the CI. The treatment also significantly enhanced the accumulation of proline associated with increase in the activity of Delta 1-pyrroline-5-carboxylate synthetase and decrease in proline dehydrogenase activity. These results indicate that EBR treatment may be an effective strategy to induce chilling tolerance of peach fruit, and the EBR-mediated amelioration of CI may be attributed to activation of phenolic and proline biosynthesis as well as inhibition of oxidative stress. (C) 2015 Elsevier B.V. All rights reserved.

分类号： S3

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