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首页> 外文期刊>Plant Disease >Fitness Attributes of Pythium aphanidermatum with Dual Resistance to Mefenoxam and Fenamidone
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Fitness Attributes of Pythium aphanidermatum with Dual Resistance to Mefenoxam and Fenamidone

机译：Pythium Aphanidermatum与双抗睫毛瘤和芬太科的健身属性

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Pythium aphanidermatum is the predominant species causing Pythium root rot on commercially grown poinsettias in North Carolina. Resistance to mefenoxam is common in populations of P. aphanidermatum but resistance to fenamidone and other quinone outside inhibitor fungicides has only just been reported in greenhouse floriculture crops. The in vitro sensitivity to the label rate of mefenoxam (17.6 mu l active ingredient [a.i]/ml) and fenamidone (488 mu l a.i./ml) was determined for 96 isolates of P. aphanidermatum. Isolates were assigned to four fungicide phenotypes: mefenoxam-sensitive/fenamidone-sensitive (MefS, FenS), mefenoxamsensitive/fenamidone-insensitive (MefS, FenR), mefenoxam-insensitive/fenamidone-sensitive (MefR, FenS), and mefenoxam-insensitive/fenamidone-insensitive (MefR, FenR). In all, 58% of isolates were insensitive to one (MefR, FenS = 36% and MefS, FenR = 16%) or both fungicides (MefR, FenR = 6%). A single point mutation in the cytochrome b gene (G143A) was identified in fenamidone-insensitive isolates. Mycelial growth rate at three temperatures (20, 25, and 30 degrees C), in vitro oospore production, and aggressiveness on poinsettia were evaluated to assess relative fitness of sensitive and insensitive isolates. Isolates with dual insensitivity to mefenoxam and fenamidone had reduced radial hyphal growth at 30 degrees C and produced fewer oospores than isolates sensitive to one or both fungicides. Isolates sensitive to both fungicides produced greater numbers of oospores. Aggressiveness on poinsettia varied by isolate but fungicide phenotype was not a good predictor of aggressiveness. These results suggest that populations of P. aphanidermatum with dual resistance to mefenoxam and fenamidone may be less fit than sensitive populations under our imposed experimental conditions but populations of P. aphanidermatum should continue to be monitored in poinsettia production systems for mefenoxam and fenamidone insensitivity.
机译：荚膜是植物的主要物种，导致藻渣在北卡罗来纳州商业种植的一品红。对Mefenoxam的抗性是在P.P.Pahanidermatum的群体中常见的，但抗芬太科和其他醌外抑制剂杀菌剂的抗性仅在温室花卉作物中似乎仅报道。测定对P. aphanidermatum的96分离株测定对mefenoxam的标记率的体外敏感性（17.6μl活性成分[a.i] / ml）和环酰胺（488μla.i./ml）。分离物分配到四种杀菌剂表型：Mefenoxam-敏感/芬太科敏感（MEFS，Fens），Mefenoxamsistitive / Fenamidone - 不敏感（MEFS，FENR），Mefenoxam不敏感/环酰胺敏感（MEFR，Fens）和Mefenoxam - 不敏感/ Fenamidone - 不敏感（MEFR，FENR）。总而，58％的分离物对一个（MEFR，Fens = 36％和MEF，FENR = 16％）或杀菌剂（MEFR，FENR = 6％）不敏感。在苯胺酮不敏感分离株中鉴定细胞色素B基因（G143A）中的单点突变。评估了三种温度（20,25和30摄氏度），体外杂波生产和一品红的侵袭性的菌丝体生长速率，以评估敏感和不敏感分离株的相对适应性。对Mefenoxam和芬太松的双重不敏感性的分离物在30摄氏度下减少了径向悬垂生长，并且比对一个或两个杀菌剂敏感的分离物产生较少的OOSpores。对杀菌剂敏感的分离物产生了更多数量的OOSpores。对一品红的侵略性因分离物而变化而异，但杀菌剂表型不是侵略性的良好预测因素。这些结果表明，P.Pahanidermatum的群体对Mefenoxam和苯胺酮的双抗性可能不那么浓度，但在我们施加的实验条件下，P.P.Pohanidermatum的群体应继续监测Mefenoxam和Fenamidone Insensity的一品红生产系统。

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  • 来源
    《Plant Disease》 |2018年第10期|共6页
  • 作者

    Lookabaugh E. C.; Kerns J. P.; Cubeta M. A.; Shew B. B.;

  • 作者单位

    North Carolina State Univ Dept Entomol &

    Plant Pathol Raleigh NC 27695 USA;

    North Carolina State Univ Dept Entomol &

    Plant Pathol Raleigh NC 27695 USA;

    North Carolina State Univ Dept Entomol &

    Plant Pathol Raleigh NC 27695 USA;

    North Carolina State Univ Dept Entomol &

    Plant Pathol Raleigh NC 27695 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物保护;
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