Screening of high toxic Metarhizium strain against Plutella xylostella and its marking with green fluorescent protein

文献类型： 外文期刊

第一作者： Cui, Qianqian

作者： Cui, Qianqian;Zhang, Yi;Zang, Yanchao;Nong, Xiangqun;Wang, Guangjun;Zhang, Zehua

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关键词： Metarhizium anisopliae;Plutella xylostella;Green fluorescent protein (GFP)

期刊名称：WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY （ 影响因子：3.312； 五年影响因子：3.58 ）

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收录情况： SCI

摘要： Entomopathogenic fungus is proposed to be one of the best biocontrol agents against the destructive insect pest Plutella xylostella. In this study, we tested the virulence of 11 Metarhizium strain isolates against P. xylostella using a leaf dipping method, and found one strain, named 609, which had displayed the highest pathogenicity. Bioassay results showed that the accumulated corrected mortality rate was 86.7 % on the eighth day after inoculation with a spore concentration 1 x 10(8) conidia/mL, and that the time to 50 % lethality was 5.7-day. The strain was identified as Metarhizium anisopliae var. acridum by internal transcribed spacer (ITS) region sequencing. A green fluorescent protein (GFP) marker containing vector, camben-gfp, was constructed and delivered into strain 609 by Agrobacterium tumefaciens-mediated transformation. Six positive clones expressing GFP were selected and tested for toxicity against P. xylostella, all of which displayed the same toxicity as the parental wild type strain. The survival rate of transformant T1 was investigated by monitoring GFP levels at 4-day intervals after inoculation into soil. We found that the concentration of Metarhizium spores decreased sharply from 1 x 10(7) conidia/g to 1 x 10(6) conidia/g in the first 5 days after inoculation. The decreasing trend then stabilized and the spore count declined to approximately 1 x 10(4)-10(5) conidia/g after 1 month. The results of this study indicate that the expression of gfp gene in strain 609 does not alter the virulence capability of Metarhizium. This strain will therefore be useful for the control of P. xylostella and as a tool to study molecular biology properties and monitor colonization of M. anisopliae in the field

分类号： Q93

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