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首页> 外文期刊>Plant Disease >Molecular Characterization of the sdhB Gene and Baseline Sensitivity to Penthiopyrad, Fluopyram, and Benzovindiflupyr in Venturia inaequalis
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Molecular Characterization of the sdhB Gene and Baseline Sensitivity to Penthiopyrad, Fluopyram, and Benzovindiflupyr in Venturia inaequalis

机译：sdhB基因的分子表征以及对不定芽菜中对戊硫吡吡，氟吡喃和苯并文二氟吡喃的基线敏感性

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The succinate dehydrogenase inhibiting (SDHI) fungicides are a class of single-site fungicides that are increasingly important in the management of Venturia inaequalis. In this study, the baseline sensitivity of V. inaequalis to penthiopyrad, fluopyram, and benzovindiflupyr was investigated. In all, 35 to 70 isolates with no prior exposure to single-site fungicides were used to determine the effective concentration at which growth was inhibited by 50% (EC50). Mean EC50 values for the conidial germ tube growth stage for penthiopyrad, fluopyram, and benzovindiflupyr were 0.086, 0.176, and 0.0016 mu g ml(-1), respectively. Linear correlation analysis revealed a significant and positive correlation between fluopyram and penthiopyrad (P <= 0.0001, r = 0.66) and fluopyram and benzovindiflupyr (P = 0.0014, r = 0.52). Baseline sensitivities of V. inaequalis during the mycelial growth stage were also determined for fluopyram and benzovindiflupyr. EC50 values were higher for fluopyram and benzovindiflupyr during this stage compared with the conidial germ tube growth stage, with means of 0.043 and 2.02 mu g ml(-1), respectively. In addition, the sdhB gene was characterized for three isolates of V. inaequalis collected from a research, baseline, and commercial orchard population. No common mutation sites associated with SDHI resistance in other phytopathogenic fungi were discovered in these isolates or isolates that were recovered following field applications of SDHI fungicides. The results of this study suggest that SDHI fungicides have a high level of activity during the conidial germ tube elongation stage in V. inaequalis and provide a basis for phenotypic and genotypic monitoring of shifts toward resistance of V. inaequalis populations to the SDHI fungicide class.
机译：琥珀酸脱氢酶抑制（SDHI）杀菌剂是一类单点杀菌剂，在不等Venturia的处理中越来越重要。在这项研究中，调查了不等纳弧菌对戊硫吡rad，氟吡草胺和苯并乙二氟吡草的基线敏感性。总共使用了35到70个事先未接触过单点杀真菌剂的分离株来确定有效浓度，在该浓度下生长被抑制50％（EC50）。五硫吡喃酮，氟吡草胺和苯并二氟吡草的分生孢子胚管生长阶段的平均EC50值分别为0.086、0.176和0.0016μgml（-1）。线性相关分析显示，氟吡喃和戊硫吡rad（P <= 0.0001，r = 0.66）与氟吡喃和苯并文二氟吡喃（P = 0.0014，r = 0.52）之间存在显着正相关。还确定了氟吡虫啉和苯并文二氟吡草在菌丝体生长阶段不等尖线虫的基线敏感性。与分生孢子胚管生长阶段相比，此阶段氟吡虫草和苯并文二氟草醚的EC50值更高，分别为0.043和2.02μg ml（-1）。另外，针对从研究，基准和商业果园种群中收集的三个不等边弧菌分离株，对sdhB基因进行了表征。在这些菌株或在田间施用SDHI杀菌剂后回收的菌株中未发现与其他植物病原真菌中SDHI抗性相关的常见突变位点。这项研究的结果表明，SDHI杀菌剂在不等分枝孢子的分生孢子胚管延长阶段具有很高的活性，并为表型和基因型监测不等分枝弧菌种群对SDHI杀真菌剂的抗性转变提供了基础。

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