数字农科院2.0

Calcium chloride enhances phenylpropanoid metabolism, antioxidant ability and phytohormone signaling to effectively alleviate chilling injury in postharvest nectarines

文献类型： 外文期刊

作者： Yudong Liu;Jinlong Wu;Yong Li;Wei Deng;Ke Cao;Zhengguo Li;Lirong Wang

作者机构：

关键词： Antioxidant;Chilling injury;Peach;Phenylpropanoid pathway;Phytohormone;ROS

期刊名称： Postharvest Biology and Technology

ISSN： 0925-5214

年卷期： 2024 年 217 卷

页码：

收录情况： SCIE（2024版）

摘要： Postharvest low-temperature storage is the main strategy for extending the shelf life of peach fruit, but unsuitable low temperatures are susceptible to induced chilling injury for peaches. In this study, postharvest calcium chloride (CaCl2) treatment effectively mitigated cold damage in nectarines during long-term low-temperature storage. CaCl2 treatment influences plenty of genes participated in secondary metabolite biosynthesis and primarily affects the phenylpropanoid pathway. The total phenolic and flavonoid contents significantly increased by 12.5 % and 80.6 % in CaCl2-treated fruit, respectively. This increase was caused by the elevated expression of phenylpropanoid metabolism enzymes, including phenylalanine ammonia-lyase (PAL), 4-coumarate-CoA ligase (4CL), and chalcone synthase (CHS). PAL activity, located upstream of the phenylpropanoid pathway, was enhanced by the CaCl2 treatment. Additionally, CaCl2 significantly enhanced the ROS-scavenging capacity of nectarines, with a significant reduction in ROS content and a significant increase in the activity of several antioxidant enzymes in the CaCl2-treated fruit. Furthermore, CaCl2 promoted the expression of several genes involved in auxin, gibberellin, and abscisic acid metabolism and signaling to mitigate chilling injury. And CaCl2 treatment reduced fruit decay by enhancing the expression of pathogen resistance genes. Overall, our study revealed that CaCl2 treatment enhances chilling injury resistance in nectarines through both non-enzymatic and enzymatic antioxidant systems, and demonstrated that postharvest CaCl2 treatment is an effective strategy to extend the cold storage of peaches.

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