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玉米赤霉烯酮脱毒菌株的筛选及脱毒机理初探
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Preliminary study on screen of detoxified strain of zearalenone and mechanism of detoxification
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    摘要:

    为筛选高效脱除玉米赤霉烯酮(Zearalenone,ZEN)的脱毒菌株,利用96孔板高通量筛选法,从135份赤霉病高发区域土壤样品中成功筛选出具有较强ZEN清除作用的两株芽孢杆菌Fu2-3和Fu41-3。经16S rRNA序列分析,菌株Fu2-3和Fu41-3分别为解淀粉芽孢杆菌(Bacillus amyloliquefaciens)和特基拉芽孢杆菌(Bacillus tequilensis)。对其降解机理的初步研究表明,两株菌对ZEN均具有一定程度的吸附作用,但主要脱毒作用仍为生物的降解作用。BLYES法研究结果表明,菌株Fu41-3的脱毒体系中仍具有较大雌激素毒性,菌株Fu2-3脱毒体系无雌激素响应,该菌可将ZEN转化为雌激素含量极低的代谢产物,脱毒效果更佳。筛选获得了两株ZEN降解芽孢杆菌,为ZEN的生物脱毒提供了一定的理论依据。

    Abstract:

    The study was aimed to screen the strain for efficiently detoxifying zearalenone(ZEN). Two strains named Fu2-3 and Fu41-3 withgood performance in scavenging ZEN were screened out by 96-well plate high throughput screening among 135 soil samples collected from different areas where were highly infected bygibberellic disease. The strains were preliminarily identified as Bacillus amyloliquefaciens and Bacillus tequilensis based on 16S rRNAgene sequencing. The preliminary study on their detoxification mechanism showed that they were able to adsorb ZEN, but the main detoxification was bio-degradation. The result of BLYES assay indicated that the detoxification system of strain Fu41-3 still contained considerable estrogen toxicity,while strain Fu2-3 did not, by which ZEN would be transformed into metabolite with extremely low estrogenic toxicity. The two strains were isolated through screening, which provides theoretical evidence for bio-detoxification of ZEN.

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张倩,熊犍,赵晨,汪洋,张晓琳.玉米赤霉烯酮脱毒菌株的筛选及脱毒机理初探[J].粮油食品科技,2016,24(6):76-81.

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  • 在线发布日期: 2016-11-29
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