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首页> 外文期刊>Plant Disease >Isolate-Cultivar Interactions, In Vitro Growth, and Fungicide Sensitivity of Fusarium oxysporum Isolates Causing Seedling Disease on Soybean
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Isolate-Cultivar Interactions, In Vitro Growth, and Fungicide Sensitivity of Fusarium oxysporum Isolates Causing Seedling Disease on Soybean

机译：孤立品种的相互作用，体外生长，镰刀菌的杀菌剂和杀菌剂敏感性，导致大豆幼苗病

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摘要

Fusarium oxysporum is frequently associated with soybean root rot in the United States. Information about pathogenicity and other phenotypic characteristics of F. oxysporum populations is limited. The objective of the research described herein was to assess phenotypic characteristics of F, oxysporum isolates from soybean, including the interaction between isolates and soybean cultivars, fungal growth characteristics in culture, and sensitivity to fungicides commonly used as seed treatment products, The pathogenicity of 14 isolates was evaluated in rolled-towel and Petri-dish assays using 11 soybean cultivars. In the rolled-towel assay, seed were inoculated with a conidial suspension and disease severity was observed. In the Petri-dish assay, F. oxysporum isolates were grown on 2% water agar and seed were placed on the F. oxysporum colony to observe the symptoms that developed. Cultivars differed in susceptibility to F. oxysporum, and significant (P = 0.0140) isolate cultivar interactions were observed. F. oxysporum isolates differed in radial growth on potato dextrose agar at 25 degrees C. Pyraclostrobin and trifloxystrobin reduced conidial germination with average 50% effective concentration (EC50) of 0.15 and 0.20 lig active ingredient (a.i.)/ml, respectively. Ipconazole reduced fungal growth with average EC50 of 0.23 mu g a.i./ml, whereas fludioxonil was ineffective. Our results illustrate soybean F. oxysporum isolate variability and the potential for their management through cultivar selection or seed treatment.
机译：镰刀酸镰刀菌通常与美国的大豆根腐腐有关。有关F. oxysporum群体的致病性和其他表型特征的信息有限。本文所述的研究的目的是评估来自大豆的F，Oxysporum分离物的表型特征，包括分离物和大豆品种之间的相互作用，培养的真菌生长特征，以及常用作为种子处理产品的杀菌剂的敏感性，致病性为14使用11种大豆种在轧制毛巾和培养皿测定中评估分离物。在轧制毛巾测定中，将种子接种分析悬浮液，并且观察到疾病严重程度。在培养皿测定中，将F. oxysporum分离物生长在2％的水琼脂上，并将种子置于F. oxysporum菌落中以观察到开发的症状。栽培品种对F. oxysporum的易感性不同，并且观察到显着的（p = 0.0140）分离物品种相互作用。 F. oxysporum分离株在25摄氏度的马铃薯葡萄糖琼脂上的径向生长不同。吡咯醇蛋白和三氟叶蛋白分别降低了分枝芽孢杆菌的分析萌发，其平均50％有效浓度（EC 50）分别为0.15和0.20LIG活性成分（A.i。）/ mL。 Ipconazole降低了真菌生长，平均EC50为0.23μga.i./ml，而Fludioxonil是无效的。我们的结果说明了大豆F. Oxysporum通过品种选择或种子处理分离可变性和潜力。

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

    Jimenez D. R. Cruz; Ellis M. L.; Munkvold G. P.; Leandro L. F. S.;

  • 作者单位

    Iowa State Univ Dept Plant Pathol &

    Microbiol Ames IA 50011 USA;

    Iowa State Univ Dept Plant Pathol &

    Microbiol Ames IA 50011 USA;

    Iowa State Univ Dept Plant Pathol &

    Microbiol Ames IA 50011 USA;

    Iowa State Univ Dept Plant Pathol &

    Microbiol Ames IA 50011 USA;

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