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首页> 外文期刊>European Journal of Plant Pathology >Assessment of the antifungal activity of selected biocontrol agents and their secondary metabolites against Fusarium graminearum
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Assessment of the antifungal activity of selected biocontrol agents and their secondary metabolites against Fusarium graminearum

机译：评估选定的生物控制剂的抗真菌活性及其对镰刀酸镰刀菌的次级代谢物

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摘要

Fusarium graminearum (teleomorph: Gibberella zeae) is the causal agent of several destructive diseases in cereal crops worldwide. In the present study we have evaluated the potential of two strains of Trichoderma sp. (T23, and T16), a strain of Paecilomyces sp. (PS1), and their secondary metabolites (SMs) in suppressing F. graminearum. Results from dual culture experiments show that in the presence of either Trichoderma sp., or Paecilomyces sp. mycelial growth of F. graminearum is considerably inhibited. Strain T23 causes the greatest inhibition (83.8%), followed by strain T16 (72.2%), and strain PS1 (61.9%). Likewise, mycelial growth of the pathogen is completely inhibited (ae&yen& 98%) when grown under exposure to volatile metabolites excreted from Trichoderma cultures. Bioautographic analyses using culture filtrates revealed that several antifungal SMs are excreted. Among five metabolites tested, 6-pentyl-alpha-pyrone (6PAP) from strain T23, and PF3 from strain PS1 exhibit pronounced antifungal activity against F. graminearum. A new method for mass production of perithecia of F. graminearum which is simple and more effective than traditional methods was developed, which allows an increase in perithecial formation of more than 5-fold. Using this method, we found, that in the presence of SMs perithecial formation was negatively affected. Perithecial production was suppressed by 81.4% and 76.6% using 200 mu g ml(-1) of either 6PAP or PF3, respectively. Moreover, ascospore discharge was significantly suppressed (67.0%) when perithecia were exposed to the metabolite F116 produced by T16. Including 6PAP or PF3 in conidial suspensions impeded germination of conidia completely. Similarly, both metabolites strongly inhibited ascospore germination (& 90%).
机译：Fusarium Graminearum（Teleomorph：Gibberella Zeae）是全球谷物作物几种破坏性疾病的因果因子。在本研究中，我们已经评估了两种Trichoderma Sp的潜力。 （T23和T16），佩西霉菌菌株SP。 （PS1）及其辅助代谢物（SMS）抑制F. Graminearum。双重培养实验的结果表明，在Trichoderma Sp存在下。或佩西莫氏菌。 F. Graminearum的菌丝体生长受大相当抑制。菌株T23导致最大的抑制（83.8％），其次是菌株T16（72.2％），菌株PS1（61.9％）。同样地，当暴露于从Trichoderma培养物中排出的挥发性代谢物被生长时，将病原体的菌丝体生长完全抑制（AE＆amp; LT; YEN＆amp; GT; 98％）。使用培养物滤液的生物构成分析显示出几种抗真菌短信被排出。在测试的五种代谢物中，来自菌株T23的6-戊基-α-芘（6PAP），来自菌株PS1的PF 3表现出对F. Graminearum的明显抗真菌活性。开发了一种新的麦克风植物的新方法，其简单且比传统方法更加有效，这允许近于5倍的壮大地层增加。使用这种方法，我们发现，在SMS的存在下存在受到负面影响。使用200μgml（-1）分别抑制了6pap或pf3的200mm g ml（-1）抑制了81.4％和76.6％。此外，当脊柱体暴露于T16产生的代谢物F116时，Ascospore放电显着抑制（67.0％）。包括共分枝悬浮液中的6PAP或PF3，完全阻碍了分泌的萌发。同样，代谢物都强烈抑制了Ascospore发芽（＆amp; 90％）。

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