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首页> 外文期刊>Environmental Science & Technology >Persistence of Escherichia coli O157:H7 in Major Leafy Green Producing Soils
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Persistence of Escherichia coli O157:H7 in Major Leafy Green Producing Soils

机译：大肠杆菌O157：H7在主要绿叶土壤中的持久性

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摘要

Persistence of Escherichia coli O157:H7 in 32 (16 organically managed and 16 conventionally managed) soils from California (CA) and Arizona (AZ) was investigated. Results showed that the longest survival (ttd, time needed to reach detection limit, 100 CFU g~(-1) dry soil) of E. coli O157:H7 was observed in the soils from Salinas Valley, CA and in organically managed soils from AZ. Detrended correspondence analysis revealed that die survival profiles in organically managed soils in Yuma, AZ were different from the ones in conventionally managed soils from the same site. Principal component analysis and stepwise regression analysis showed that E. coli O157:H7 survival in soils was negatively correlated with salinity (EC) (P < 0.001), while positively correlated with assimilable organic carbon (AOC) and total nitrogen (TN) (P < 0.01). Pearson correlation analysis revealed that a greater ttd was associated with a larger S (time needed for first decimal reduction in E. coli population). EC was negatively correlated and TN was positively correlated (P < 0.05) with 8, suggesting that EC and TN likely have a direct impact on ttd. On the other hand, AOC showed a close correlation with p (the shape parameter) that was not directly related to ttd, indicating mat AOC might have an indirect effect in the overall survival of E. coli O157:H7 in soils. Our data snowed that AOC and EC significantly affected the survival of E. coli O157:H7 in leafy green producing soils and the development of good agricultural practices (manure/composting/irrigation water source management) in the preharvest environment must be followed to minimize foodborne bacterial contamination on fresh produce.
机译：研究了大肠杆菌O157：H7在来自加利福尼亚（CA）和亚利桑那（AZ）的32种土壤（16种有机管理和16种常规管理）中的持久性。结果表明，在加利福尼亚州萨利纳斯山谷的土壤和加利福尼亚州萨利纳斯山谷的有机管理土壤中，观察到大肠杆菌O157：H7的最长存活时间（ttd，达到检测极限所需的时间，100 CFU g〜（-1）干燥土壤）。 AZ。趋势去趋势对应分析表明，亚利桑那州尤马市有机管理土壤的死亡存活特征与同一地点的常规管理土壤的存活特征不同。主成分分析和逐步回归分析表明，土壤中大肠杆菌O157：H7的存活率与盐度（EC）呈负相关（P <0.001），而与同化有机碳（AOC）和总氮（TN）呈正相关（P <0.01）。 Pearson相关分析显示，更大的ttd与更大的S相关联（大肠杆菌群体第一次减少小数所需的时间）。 EC与TN呈负相关，而TN与8呈正相关（P <0.05），表明EC和TN可能对ttd有直接影响。另一方面，AOC显示与p（形状参数）紧密相关，而p与ttd不直接相关，这表明垫AOC可能对土壤中O157：H7大肠杆菌的整体存活具有间接影响。我们的数据表明，AOC和EC会严重影响绿叶土壤中大肠杆菌O157：H7的存活，因此必须遵循收获前环境中良好农业规范的发展（粪便/堆肥/灌溉水源管理），以最大程度地减少食源性食物新鲜农产品上的细菌污染。

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  • 来源
    《Environmental Science & Technology》 |2012年第21期|12154-12161|共8页
  • 作者

    Jincai Ma; A. Mark Ibekwe; David E. Crowley; Ching-Hong Yang;

  • 作者单位

    USDA-ARS U.S. Salinity Laboratory, Riverside, California 92507, United States,Department of Environmental Sciences, University of California, Riverside, California 92521, United States,Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, CA 94550;

    USDA-ARS U.S. Salinity Laboratory, Riverside, California 92507, United States,USDA-ARS-U.S. Salinity Laboratory, 450 W. Big Springs Rd., Riverside, CA 92507 Present Address;

    Department of Environmental Sciences, University of California, Riverside, California 92521, United States;

    Department of Biological Sciences, University of Wisconsin, Milwaukee, Wisconsin 53211, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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