23 10 月

Inhibition on anthracnose and induction of defense response by nitric oxide in pitaya fruit

2024 年 10 月 23 日
栽培管理技術, 期刊論文
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作者： Hu, Meijiao ; Zhu, Yingying ; Liu, Gangshuai ; Gao, Zhaoyin ; Li, Min ; Su, Zihan ; Zhang, Zhengke
刊名： Scientia horticulturae
期刊所屬國別：
出版年： 201902
關鍵字： Nitric oxide
摘要： "•Nitric oxide (NO) inhibited anthracnose, Colletotrichum gloeosporioides, in pitaya fruit.•NO enhanced defense responses and delayed senescence in pitaya fruit.•NO treatment could be a promising approach to control anthracnose in pitaya fruit. The effect of nitric oxide (NO) on resistance of pitaya fruit against anthracnose caused by Colletotrichum gloeosporioides and its related mechanisms were investigated in this study. ‘Baiyulong’ pitaya fruit were immersed in 0.1 mM sodium nitroprusside (a NO donor) for 8 min, inoculated with spore suspension of C. gloeosporioides after 24 h of NO treatment, and then stored at 25 °C for up to 8 days. NO treatment markedly inhibited the lesion expansion on pathogen-inoculated pitaya fruit during storage. NO treatment also reduced the natural disease incidence and index of pitaya fruit stored at 25 °C. Furthermore, NO treatment increased the activities of defense-related enzymes including phenylalanine ammonia-lyase (PAL), CoA ligase (4CL), peroxidase (POD), polyphenol oxidase (PPO), chitinase (CHI) and β-1,3-glucanase (GLU), as well as elevated the contents of antifungal compounds including total phenolics, flavonoids and lignin. In addition, NO treatment reduced respiration rate and weight loss, while delayed the declines of firmness and soluble solids content (SSC). These results indicate that NO could effectively enhance the resistance of pitaya fruit to anthracnose, which might be ascribed to activation of defense responses and retardation of senescence."
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