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首页> 外文期刊>European Journal of Plant Pathology >Efficacy and dose–response relationship in biocontrol of Fusarium disease in maize by Streptomyces spp.
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Efficacy and dose–response relationship in biocontrol of Fusarium disease in maize by Streptomyces spp.

机译：链霉菌属生物防治玉米镰刀菌病的功效和剂量反应关系。

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Two isolates of Streptomyces spp. DAUFPE 11470 and DAUFPE 14632 were evaluated to determine the antagonist–pathogen inoculum concentration relationship under greenhouse conditions. Pathogen and antagonist concentration, significantly (P < 0.05) affected development of Fusarium disease in maize with a significant interaction between pathogen and antagonist concentration. Dose–response relationship also differed significantly (P < 0.05) between the two isolates, but both isolates demonstrated effective control of Fusarium disease, regardless of pathogen concentration. The isolate DAUFPE 11470 provided the most effective control. The lowest value for disease incidence occurred at low pathogen (103 chlamydospore g?1 soil) and high antagonist concentration (106 cfu ml?1) for both isolates. The disease incidence for control plants ranged from 19% to 76%. However, in relation to control the lowest disease reduction occurred at low pathogen (103 chlamydospore g?1 soil) and high antagonist concentrations (106 cfu ml?1). These reductions were 10.6% and 13% for DAUFPE 14632 and DAUFPE 11470, respectively. The highest disease reductions, in relation to control plants, occurred at high pathogen (106 chlamydospore g?1 soil) and antagonist (106 cfu ml?1) concentrations for both isolates. These values were 55% and 62.2% for DAUFPE 14632 and DAUFPE 11470, respectively. The chlamydospore germination of Fusarium moniliforme was affected by glucose addition, antagonist isolates and type of inoculum. The lowest chlamydospore germination was observed with bacterial suspensions of the isolates, for all glucose additions. The results suggested that both Streptomyces spp. isolates were effective at different doses as biocontrol agents against F. moniliforme. Also, there was evidence for at least two mechanisms of biocontrol and that apparently, both isolates showed the same mechanisms of biocontrol action related to production of bioactive compounds and competition for carbon. Further studies will be developed to improve the level and effectiveness of control by these isolates.
机译：链霉菌属的两个分离株。对DAUFPE 11470和DAUFPE 14632进行了评估，以确定温室条件下拮抗剂与病原菌接种物的浓度关系。病原体和拮抗剂浓度显着（P <0.05）影响玉米镰刀菌病的发展，病原体和拮抗剂浓度之间存在显着的相互作用。两种分离株之间的剂量-反应关系也存在显着差异（P <0.05），但无论病原体浓度如何，两种分离株均能有效控制镰刀菌病。隔离株DAUFPE 11470提供了最有效的控制。两种病原菌的病原菌含量最低（103 衣原体g？1 土壤）和拮抗剂浓度高（106 cfu ml？1 ）最低。对照植物的发病率在19％至76％之间。但是，相对于控制而言，病原菌含量低（103 s衣原体g？1 ）和拮抗剂浓度高（106 cfu ml？1 ）时，病害减少率最低。 DAUFPE 14632和DAUFPE 11470分别减少了10.6％和13％。与对照植物相比，最大的病害减少发生在高致病菌浓度（106 衣原体孢子g？1 土壤）和拮抗物（106 cfu ml？1 ）浓度下。两者分离。 DAUFPE 14632和DAUFPE 11470的这些值分别为55％和62.2％。葡萄糖添加，拮抗剂分离物和接种物类型影响了镰刀菌镰刀菌的衣原体萌发。对于所有葡萄糖添加，分离物的细菌悬浮液观察到的衣原体芽最低。结果表明两个链霉菌属。分离株在不同剂量下均有效作为针对念珠菌的生物防治剂。同样，有证据表明至少存在两种​​生物防治机制，并且显然，两种分离物都显示出与生物活性化合物的产生和碳竞争有关的相同生物防治作用机制。将开展进一步的研究以提高这些分离株的控制水平和有效性。

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