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Methylparaben suppresses the citrus postharvest pathogen Penicillium digitatum by undermining the cell wall and membrane and inducing the antioxidant system

文献类型： 外文期刊

作者： Yang, Fan 1 ; Zhong, Xiuying 2 ; Wang, Yuqing 2 ; Zhao, Juan 2 ; Lu, Yongqing 2 ; Long, Chao-an 2 ;

作者机构： 1.Henan Inst Sci & Technol, Coll Hort & Landscape Architecture, Henan Prov Engn Res Ctr Hort Plant Resource Utiliz, Xinxiang 453003, Peoples R China

2.Huazhong Agr Univ, Natl R&D Ctr Citrus Preservat, Natl Ctr Citrus Breeding, Natl Key Lab Germplasm Innovat & Utilizat Hort Cro, Wuhan 430070, Peoples R China

3.Huazhong Agr Univ, Shenzhen Inst Nutr & Hlth, Wuhan 430070, Peoples R China

4.Chinese Acad Agr Sci, Agr Genom Inst Shenzhen, Shenzhen Branch, Genome Anal Lab,Minist Agr,Guangdong Lab Lingnan M, Shenzhen 518000, Peoples R China

关键词： Citrus; Penicillium digitatum; Methylparaben; Inhibitory mechanism

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：3.9； 五年影响因子：4.3 ）

ISSN： 0304-4238

年卷期： 2024 年 333 卷

页码：

收录情况： SCI

摘要： Parabens are one of the "generally regarded as safe" salts since its lower toxicity for the environment and human health. The curative activities of methylparaben (MP) had been detected previously by applying them into coating films in some fruits. In this study, we investigated the antifungal activities and putative mechanisms of MP against Penicillium digitatum, which causes the destructive citrus green mold disease during postharvest period. The results indicated that MP inhibited the P. digitatum hyphal growth in vitro at a minimum inhibitory/ fungicidal concentration of 0.40 and 0.60 g L-1, respectively. The conidial germination rates were also distinctly restrained. Under scanning and transmission electron microscopies, the treated hyphae were slender and shrunken, had defects in developing conidiophores, and exhibited apoptotic mitochondria and vacuolated cytoplasmic matrix. Meanwhile, MP damaged the plasma membrane to accelerate the intracellular substances leaking out, and induced the activity of chitinase to degrade cell wall. The MP-treated hyphae showed activated the antioxidant enzymes, superoxide dismutase and peroxidase, and stimulated the content of antioxidant glutathione. MP alleviated the disease prevalence of inoculated citrus in the fruit decay test, but did not display good preservative effect in storage experiment. Collectively, our findings basically elucidate the underlying physiological antifungal mechanism of MP against P. digitatum.

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