Induces Resistance in Postharvest Citrus by Activating the Phenylpropanoid Biosynthesis Pathway.

This study aimed to investigate the effect of on disease resistance and elucidate the changes in phenylpropane biosynthesis treated by in postharvest citrus. The results showed that reduced the disease incidence and lesion diameters without direct contact with the pathogen . Transcriptome analysis revealed that phenylpropanoid biosynthesis was triggered by . Genes encoding phenylpropanoid biosynthesis were upregulated, including phenylalanine ammonia-lyase (PAL), 4-coumaroyl-CoA ligase (4CL), cinnamate-4-hydroxylase (C4H), peroxidase (POD), cinnamyl alcohol dehydrogenase (CAD), O-methyltransferase, and hydroxyl cinnamoyl transferase. Moreover, increased the activity of PAL, 4CL, C4H, POD, polyphenol oxidase, and CAD in citrus pericarp. In addition, treated citrus displayed higher levels of total phenolic compounds, flavonoid, and lignin and higher amounts of ferulic and sinapic acid. In conclusion, these results suggested that could induce resistance through modulating the pathway of phenylpropanoid biosynthesis in postharvest citrus.