First record of Aspergillus oryzae (Eurotiales: Trichocomaceae) as an entomopathogenic fungus of the locust, Locusta migratoria (Orthoptera: Acrididae)

文献类型: 外文期刊

第一作者: You, Yinwei

作者: You, Yinwei;Zhang, Long;You, Yinwei;Song, Yuan;Wang, Youzhi

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关键词: entomopathogenic fungus;Aspergillus oryzae;locust;biological control;bioassay;phylogenetic analysis

期刊名称:BIOCONTROL SCIENCE AND TECHNOLOGY ( 影响因子:1.665; 五年影响因子:1.616 )

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收录情况: SCI

摘要: A novel entomopathogenic fungus of Locusta migratoria was identified as Aspergillus oryzae using a comparative sequence analysis of the internal transcribed spacer regions, aflatoxin B1 detection and morphological analysis. The fungus isolated from a dead locust collected in northwestern China was found to be pathogenic to the insect. Phylogenetic experiments revealed a 99% similarity between the fungus and those of three species, A. oryzae, Aspergillus flavus and Aspergillus parvisclerotigenus which are in the same branch of the Flavi section of the genus Aspergillus. Tests to detect aflatoxin B1 demonstrated that this fungus is a non-aflatoxin B1 producer, unlike A. parvisclerotigenus. Furthermore, morphological comparison with A. oryzae and A. flavus revealed that Aspergillus sp. XJ-1 belongs to A. oryzae, and named as A. oryzae XJ-1. The results of bioassays against third-instar locusts showed that mortality was dose-dependent and its median lethal concentrations were 3.3 x 10(8), 1.7 x 10(7) and 7.2 x 10(6) conidia/ml on the 10th-, 13th- and 15th-day post-inoculation. Therefore, the A. oryzae XJ-1 may have biocontrol potential against locusts.

分类号: S476

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