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首页> 外文期刊>Veterinary Parasitology >First record of Aspergillus oryzae as an entomopathogenic fungus against the poultry red mite Dermanyssus gallinae
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First record of Aspergillus oryzae as an entomopathogenic fungus against the poultry red mite Dermanyssus gallinae

机译：首先记录曲霉属植物，作为针对家禽红螨Dermanyssus Hallinae的昆虫致病真菌

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摘要

The poultry red mite, Dennanyssus gallinae, is a blood-feeding ectoparasite that affects egg-laying hens worldwide. Strategies to control this parasite have focused in the use of entomopathogenic fungi, such as Metarhizium anisopliae. However, only a few studies have evaluated the use of Aspergillus oryzae to control D. gallinae and none of them have employed native strains. In the work presented here, a novel entomopathogenic fungus was isolated from a dead D. gallinae. The results of phylogenetic analysis showed 100% similarity between the isolated strain and those of two species, A. oryzae and Aspergillus flavus, and 99.82% similarity with A. parviscler-otigenus, which were in the same branch of the Flavi section of the genus Aspergillus. This entomopathogenic fungus was a non-aflatoxin B1 producer, as shown by the presence of aflatoxin B1 in the conidial infection suspension. Morphological features of fungus in comparison with A. oryzae and A. flavus indicated that the isolated strain belonged to A. oryzae, and was named Aspergillus sp. Dg-1. The pathogenicity of Aspergillus sp. Dg-1 on D. gallinae at different life stages was then assessed under laboratory conditions. The experiments showed that the isolated strain significantly increased the mortality rate in adult mites, up to 24.83 +/- 2.25, compared to the mortality rates in the control group, which were 15.17 +/- 2.75 (P 0.05). However, Aspergillus sp. Dg-1 did not have pathogenic effects on the second nymph stage of D. gallinae. Our findings demonstrate that Aspergillus sp. Dg-1 has pathogenic effects on D. gallinae in their adult stage, presenting biocontrol potential against D. gallinae.
机译：家禽红螨Dennanyssus gallinae是一种血液喂养的异位酸盐，影响全世界的鸡蛋母鸡。控制这种寄生虫的策略都集中在使用昆虫致病真菌，例如Metarhizium Anisopliae。然而，只有少数研究评估了aspergillus oryzae对控制d. gallinae而且它们都没有使用本地菌株。在这里呈现的工作中，从死亡D. Gallinae中分离出一种新的昆虫致病真菌。系统发育分析结果显示出分离菌株与两种物种，A. oryzae和Aspergillus flavus之间的100％相似性，与A. parviscler-origenus的相似性为99.82％，其在属属的Flavi部分的同一分支中曲霉。这种受昆虫致病性真菌是非黄曲霉毒素B1生产商，如在分析感染悬浮液中的黄曲霉毒素B1的存在所示。与A. oryzae和A.Flavus相比真菌的形态学特征表明，分离的菌株属于A. Oryzae，并被命名为曲霉SP。 DG-1。曲霉属植物的致病性。然后在不同寿命的D. Gallinae在实验室条件下进行评估。实验表明，与对照组的死亡率相比，分离的菌株显着提高了成年螨中的死亡率，高达24.83 +/- 2.25，其为15.17 +/- 2.75（P <0.05）。然而，aspergillus sp。 DG-1对D. Gallinae的第二个若虫阶段没有致病作用。我们的研究结果表明aspergillus sp。 DG-1对其成人阶段的D. Gallinae具有致病作用，呈现对抗D. Gallinae的生物控制潜力。

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