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首页> 外文期刊>Acta Horticulturae >Inhibition of Aspergillus parasiticus growth and aflatoxin production by antagonistic bacteria isolated from soils of pistachio orchards.
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Inhibition of Aspergillus parasiticus growth and aflatoxin production by antagonistic bacteria isolated from soils of pistachio orchards.

机译：从开心果园土壤中分离出来的拮抗细菌对寄生曲霉菌生长和黄曲霉毒素的抑制作用。

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摘要

In the present study, bacteria isolated from soils of pistachio orchards of Damghan-Iran were evaluated for their inhibitory activity toward Aspergillus parasiticus growth and aflatoxin production. Antagonistic activity of the isolated bacteria was screened against a non-aflatoxigenic nor-mutant of A. parasiticus, which accumulated the pigmented aflatoxin precursor norsolorinic acid (NOR) under conditions conductive to aflatoxin production. Using visual plate assay in co-culture experiments on glucose yeast extract agar, antagonistic bacteria showed inhibition of A. parasiticus growth and/or NOR accumulation. Of 290 bacterial strains screened from pistachio orchards, 37 strains inhibited both fungal growth and NOR accumulation, 22 strains inhibited fungal growth and 9 strains inhibited only NOR production. Remaining 232 strains were not inhibitory for both fungal growth and NOR production. Molecular and physiological identification of the bacterial strains indicated that the predominant genera isolated were Bacillus and Pseudomonas. Our results demonstrated the presence of antagonistic bacteria in soils of pistachio orchards and their potential in developing individual biocontrol agents for simultaneous control of the growth and aflatoxin production by A. parasiticus.
机译：在本研究中，评估了从丹甘伊朗开心果园土壤中分离出的细菌对寄生曲霉菌生长和黄曲霉毒素产生的抑制活性。筛选分离的细菌的抗拮抗活性，以抗寄生黄曲霉的非黄曲霉生成的突变体，该突变体在产生黄曲霉毒素的条件下积累有色的黄曲霉毒素前体降冰片酸（NOR）。在共培养实验中对葡萄糖酵母提取物琼脂使用视觉平板测定法，拮抗细菌显示出对寄生曲霉的生长和/或NOR积累的抑制。从开心果园筛选出的290个细菌菌株中，有37个菌株抑制了真菌的生长和NOR的积累，有22个菌株抑制了真菌的生长，有9个菌株仅抑制了NOR的产生。其余的232个菌株对真菌生长和NOR产生均没有抑制作用。细菌菌株的分子和生理学鉴定表明，分离的主要属是芽孢杆菌和假单胞菌。我们的结果表明开心果果园土壤中存在拮抗细菌，它们在开发单独的生物防治剂以同时控制寄生曲霉的生长和黄曲霉毒素生产方面具有潜力。

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