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Iron Competition as an Important Mechanism of Pulcherrimin-Producing Metschnikowia sp. Strains for Controlling Postharvest Fungal Decays on Citrus Fruit

文献类型： 外文期刊

作者： Wang, Shupei 1 ; Tan, Zhimei 4 ; Wang, Chenshu 4 ; Liu, Wenqing 4 ; Hang, Fangxue 4 ; He, Xuemei 1 ; Ye, Dongqing 1 ; Li, Li 1 ; Sun, Jian 1 ;

作者机构： 1.Guangxi Acad Agr Sci, Nanning 530007, Peoples R China

2.Guangxi Key Lab Fruits & Vegetables Storage Proc T, Nanning 530007, Peoples R China

3.Nanning Normal Univ, Coll Environm & Life Sci, Nanning 530001, Peoples R China

4.Guangxi Univ, Coll Light Ind & Food Engn, Nanning 530004, Peoples R China

关键词： Metschnikowia pulcherrima; pulcherrimin; iron competition; P. digitatum; P. italicum; G. citri-aurantii

期刊名称：FOODS （ 影响因子：5.2； 五年影响因子：5.5 ）

ISSN：

年卷期： 2023 年 12 卷 23 期

页码：

收录情况： SCI

摘要： This study identified and tested fruit-isolated Metschnikowia yeasts against three major postharvest citrus pathogens, namely, Penicillium digitatum, Penicillium italicum, and Geotrichum citri-aurantii, and further evaluated the impact of FeCl3 on the biocontrol efficiency of pulcherrimin-producing M. pulcherrima strains. Based on the characterization of the pigmented halo surrounding the colonies and the analysis of the D1/D2 domain of 26S rDNA, a total of 46 Metschnikowia sp. were screened and identified. All 46 Metschnikowia strains significantly inhibited the hyphal growth of Penicillium digitatum, Penicillium italicum, and Geotrichum citri-aurantii, and effectively controlled the development of green mold, blue mold and sour rot of citrus fruit. The introduction of exogenous FeCl3 at certain concentrations did not significantly impact the pulcherriminic acid (PA) production of pigmented M. pulcherrima strains, but notably diminished the size of pigmented zones and the biocontrol efficacy against the three pathogens. Iron deficiency sensitivity experiments revealed that P. digitatum and P. italicum exhibited higher sensitivity compared to G. citri-aurantii, indicating that iron dependence varied among the three pathogens. These results suggested that M. pulcherrima strains, capable of producing high yields of PA, possessed great potential for use as biocontrol agents against postharvest citrus diseases. The biocontrol efficacy of these yeasts is mainly attributed to their ability to competitively deplete iron ions in a shared environment, with the magnitude of their pigmented halo directly correlating to their antagonistic capability. It is worth noting that the level of sensitivity of pathogens to iron deficiency might also affect the biocontrol effect of pulcherrimin-producing M. pulcherrima.

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