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    【6h】Effect of low doses of pesticides on soilborne pathogens: An approach to the hormetic response.

    机译低剂量杀虫剂对土壤传播病原体的影响:一种应对激素反应的方法。

    【摘要】Scope and Method of Study: The effects of doses below the no observed adverse effect level (NOAEL) of disinfectants and commercial fungicides on the growth of Rhizoctonia zeae, Rhizoctonia solani, and Pythium aphanidermatum in vitro were assessed. A benchmark dose value (BMD), was determined for each chemical. Each organism was grown on solid growing media amended with two disinfectants and fungicides at different doses, with a minimum of five doses below the BMD, and a non amended control. The modeling of the hormetic effect and the inference of EC50 and NOAEL were done using a Brain-Cousens model.;Findings and Conclusions: An increase of growth at low doses of ethanol was observed for both R. zeae and P. aphanidermatum, while sodium hypochlorite showed no stimulation. Non-monotonic responses were also observed on the dose effect of cyazofamid and of propamocarb on P. aphanidermatum. In contrast, propiconazole didn't show a hormetic effect on either R. zeae or R. solani. Due to the different modes of action of the chemical agents that rendered hormetic responses on the radial growth the organisms in vitro, multiple factors are suspected to be responsible for this phenomenon. An accurate experimental design and a sensitive data analysis tool were necessary to detect the hormetic response consistently. Results suggest that hormesis may not be a generalizable phenomenon in biology but it could have a relationship with the plasticity of an organism. This study provides, for the first time, evidence that the phenomenon of hormesis occurs in oomycete and fungal plant pathogens in response to doses of disinfectants or pesticides.

    【摘要机译】研究范围和方法:评估低于消毒剂和商业杀菌剂未观察到的有害作用水平(NOAEL)的剂量对体外生根瘤菌,茄根枯菌和瓜果腐霉的生长的影响。确定每种化学品的基准剂量值(BMD)。每种生物都在固体生长培养基上生长,该培养基用不同剂量的两种消毒剂和杀真菌剂修正,最低剂量低于BMD五倍,并使用未经修正的对照。使用Brain-Cousens模型对兴奋效果进行建模并推断出EC50和NOAEL。结果与结论:玉米中的R. zeae和P. aphanidermatum在低剂量的乙醇下均观察到了生长的增加。次氯酸盐无刺激。还观察到氰草胺和扑热息威对P. aphanidermatum剂量作用的非单调响应。相比之下,丙环唑对斑节菜R. zeae或茄子R. solani均未显示出致敏作用。由于化学试剂在体外对微生物的径向生长产生了反应性反应的化学作用方式不同,因此多种因素被认为是造成这种现象的原因。要始终如一地检测出钟声响应,必须使用准确的实验设计和灵敏的数据分析工具。结果表明,兴奋剂在生物学上可能不是普遍现象,但可能与生物体的可塑性有关。这项研究首次提供了证据,表明在卵菌和真菌植物病原体中,由于消毒剂或杀虫剂的剂量而引起的兴奋现象。

    【作者】Flores, Francisco.;

    【作者单位】Oklahoma State University.;

    【年(卷),期】2010(),

    【年度】2010

    【页码】99 p.

    【总页数】99

    【原文格式】PDF

    【正文语种】eng

    【中图分类】;

    【关键词】

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