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Effects of nitric oxide on the alleviation of postharvest disease induced by Penicillium italicum in navel orange fruits |
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| Authors: | Rui Yang Huaying Du Ying Sun Fengying Zhang Wei Zhang Chunpeng Wan Jinyin Chen Liqin Zhu |
| Affiliation: | 1. College of Food Science & Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, 330045 China
Contribution: Formal analysis (lead), Writing - original draft (lead);2. College of Food Science & Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, 330045 China Contribution: Resources (equal), Software (equal);3. College of Food Science & Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, 330045 China Contribution: Formal analysis (equal), ?Investigation (lead), Methodology (lead);4. College of Food Science & Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, 330045 China Contribution: Resources (equal), Supervision (equal);5. College of Food Science & Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, 330045 China Contribution: Resources (supporting), Software (equal);6. Jiangxi Key Laboratory for Postharvest Technology & Nondestructive Testing of Fruits & Vegetables, Collaborative Innovation Center of Postharvest Key Technology & Quality Safety of Fruits & Vegetables, College of Agronomy, Jiangxi Agricultural University, Nanchang, Jiangxi, 330045 China Contribution: Methodology (equal), Resources (supporting);7. Jiangxi Key Laboratory for Postharvest Technology & Nondestructive Testing of Fruits & Vegetables, Collaborative Innovation Center of Postharvest Key Technology & Quality Safety of Fruits & Vegetables, College of Agronomy, Jiangxi Agricultural University, Nanchang, Jiangxi, 330045 China College of Materials & Chemical Engineering, Pingxiang University, Pingxiang, Jiangxi, 330045 China Contribution: Project administration (equal), Supervision (lead), Validation (lead);8. College of Food Science & Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, 330045 China |
| Abstract: | The present study evaluated the effects of 15 μL L-1 nitric oxide (NO) on the fruit defence response of ‘Newhall’ navel orange. The decay rate of NO-treated navel orange fruits was significantly lower than that of control fruits during storage at 20 °C storage (P < 0.05). Treatment with NO suppressed the increase in disease incidence and lesion area in orange fruits inoculated with Penicillium italicum (P. italicum); significantly increased the activities of phenolic metabolism-associated enzymes and pathogenesis-related (PR) proteins, including polyphenoloxidase (PPO), phenylalanine ammonia-lyase (PAL), β-1,3-glucanase (GLU) and chitinase (CHT); and enhanced the activities of key enzymes, including 4-coumarate: CoA ligase (4CL), cinnamate-4-hydroxylase (C4H) and chalcone isomerase (CHI) in the phenylpropanoid pathway. The contents of total phenolics, flavonoids and lignin were also higher in NO-treated fruits than in control fruits. The findings suggest that exogenous NO could induce disease resistance against P. italicum in navel orange fruits. |
| Keywords: | Defence response navel orange nitric oxide Penicillium italicum phenolic metabolism phenylpropanoid pathway |