数字农科院2.0

Phenylalanine enhances phenylpropanoid metabolism, inhibits fruit softening and alleviates chilling injury in tomato fruit during cold storage

文献类型： 外文期刊

作者： Liu, Yudong;Deng, Wei;Cao, Ke;Li, Zhengguo

作者机构：

关键词： Cold damage;Fruit quality;Secondary metabolism;Cell wall metabolism;Hormone signaling

期刊名称： POSTHARVEST BIOLOGY AND TECHNOLOGY

ISSN： 0925-5214

年卷期： 2025 年 234 卷

页码：

收录情况： SCIE（2025版）

摘要： Cold storage is widely used to minimize postharvest losses in horticultural crops, but tomatoes are vulnerable to chilling injury at low temperatures. This study demonstrated that applying phenylalanine (Phe) effectively mitigated chilling injury and inhibited fruit softening in tomatoes during cold storage. Metabolomic and transcriptomic analyses indicated that Phe treatment elevated the activity of phenylalanine ammonia-lyase, cinnamate 4-hydroxylase, and 4-coumarate-CoA ligase, thereby enhancing phenylpropanoid metabolism. Elevated levels of various flavonoids and ascorbic acid reinforced the free radical scavenging capacity of cold-stored fruit. Phe also promoted the activity of multiple antioxidant enzymes and reduced oxidative damage. Furthermore, Phe treatment inhibited the enzymatic activity of pectate lyase, beta-galactosidase, and cellulase, as well as suppressed pectin and cellulose degradation, thereby postponing fruit softening. Phytohormone analysis revealed that Phe treatment increased melatonin levels and modulated the expression of genes associated with various hormone signalings. Correlation analysis showed that CNR and SlGRAS10 are likely the core transcription factors involved in Phe-regulated tomato fruit softening and cold tolerance, which are closely associated with cell wall metabolism and CBF genes. This study elucidated the comprehensive regulatory effects of phenylalanine on the postharvest preservation of tomato fruit.

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