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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 u,l active ingredient [a.i.]/ml) and fenamidone (488 p.1 a.i./ml) was determined for 96 isolates of P. aphanidermatum. Isolates were assigned to four fungicide phenotypes: mefenoxam-sensitive/fenamidone-sensitive (MefS, FenS), mefenoxam-sensitive/fenamidone-insensitive (MefS, FenR), mefenoxam-insensitive/ fenamidone-sensitive (MefR, FenS), and mefenoxam-insensitive/fenarnidone-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) wasidentified in fenamidone-insensitive isolates. Mycelial growth rate at three temperatures (20, 25, and 30°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°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 phe-notype 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。对Mefenoxam的标记速率的体外敏感性（17.6u，活性成分[A.i。] / ml）和共酰胺酮（488 p.1a.i./ml）测定96个分离物的P. aphanidermatum。分离株分配到四种杀菌剂表型：Mefenoxam敏感/芬太科敏感（MEFS，Fens），Mefenoxam敏感/芬太科 - 不敏感（MEFS，FENR），Mefenoxam - 不敏感/芬太科敏感（MEFR，Fens）和Mefenoxam-不敏感/ FENARNIDONE - 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。细胞色素B基因（G143A）中的单点突变在苯胺酮不敏感分离株中均致成。在三个温度（20,25和30°C）的菌丝体生长速率，体外oospore生产和一品红的侵略性评估，评估敏感和不敏感分离株的相对适应性。与mefenoxam和芬太科的双重不敏感性有径向悬垂性在30℃下生长并产生比对一个或两种杀菌剂敏感的分离物的少孢子少。对杀菌剂敏感的分离物产生了更多数量的OOSpores。一品红的侵略性因分离物而变化，但杀菌剂Phe-nonyype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

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

  • 作者单位

    Department of Entomology and Plant Pathology North Carolina State University Raleigh 27695;

    Department of Entomology and Plant Pathology North Carolina State University Raleigh 27695;

    Department of Entomology and Plant Pathology North Carolina State University Raleigh 27695;

    Department of Entomology and Plant Pathology North Carolina State University Raleigh 27695;

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  • 正文语种 eng
  • 中图分类 植物保护;
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