Exogenous nitric oxide induces disease resistance against Monilinia fructicola through activating the phenylpropanoid pathway in peach fruit

Li, Guangjin; Zhu, Shuhua; Wu, Wenxue; Zhang, Chang; Peng, Yong; Wang, Qingguo; Shi, Jingying

Exogenous nitric oxide induces disease resistance against Monilinia fructicola through activating the phenylpropanoid pathway in peach fruit

2017

BACKGROUND: Nitric oxide (NO) is a multifunctional signaling molecule involved in plant‐induced resistance to disease. The present study aimed to investigate the relationship between disease resistance induced by NO and the phenylpropanoid pathway in peach fruit. The present study investigated the effect of NO on the main enzymes and metabolites of the phenylpropanoid pathway of harvested peach, which are probably related to disease resistance against Monilinia fructicola. RESULTS: The results showed that treatment with 15 µmol L⁻¹ NO significantly (P < 0.05) enhanced the activities of phenylalanine ammonia‐lyase, cinnamate‐4‐hydroxylase, 4‐coumaroyl‐CoA ligase, chalcone synthase and chalcone isomerase and the expression of their genes. Furthermore, NO treatment significantly (P < 0.05) increased the contents of total phenolics, flavonoids and lignin over the entire storage period and maintained higher total anthocyanin, phenolic acid and anthocyanin contents during the earlier storage period. CONCLUSION: These results suggest that NO treatment could activate the phenylpropanoid pathway to enhance the activity of related enzymes and the contents of phenylpropanoid metabolites in peach to improve disease resistance and prevent pathogenic invasion. © 2016 Society of Chemical Industry

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