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Screening and Identifying a Cadmium-resistant Fungus and Characterizing its Cadmium Adsorption

文献类型： 外文期刊

作者： Deng, Yanan 1 ; Wang, Lifeng 1 ; Luo, Kun 2 ; Peng, Di 1 ; Jiang, Huidan 1 ; Jin, Chenzhong 3 ; Zhou, Xiaomao 1 ; Bai, Li 1 ;

作者机构： 1.Hunan Agr Biotechnol Res Ctr, Changsha 410125, Hunan, Peoples R China

2.Hunan Agr Univ, Coll Plant Protect, Changsha 410125, Hunan, Peoples R China

3.Collaborat Innovat Ctr Field Weeds Control, Loudi 417000, Hunan, Peoples R China

关键词： paddy soil;Cd pollution;Penicillium sp.;Cd adsorption

期刊名称：POLISH JOURNAL OF ENVIRONMENTAL STUDIES （ 影响因子：1.699； 五年影响因子：1.654 ）

ISSN： 1230-1485

年卷期： 2017 年 26 卷 3 期

页码：

收录情况： SCI

摘要： The main aim of this study was to screen and identify cadmium-resistant fungus and to characterize its cadmium adsorption. A cadmium-resistant strain (CN35) was isolated from cadmium-polluted paddy soil. Based on morphlogical characteristics, internal transcribed spacers region and beta-tubulin gene sequence phylogenesis analysis, the strain was preliminarily identified to be Penicillium sp. This strain was resistant to Cd at 45 mM with Cd adsorption rate up to 83.56%, and also resistant to other heavy metals such as Pb, Zn, and Cu. When Cd2+ concentration ranged from 2 to 5 mM, the fungal colony changed from yellow/green to red. The colony morphology was also affected by Cd2+ concentrations with protuberances forming on the colony surface at 20 mM. The strain CN35 was found to grow well at pH 4 to 8 at between 24 degrees C and 37 degrees C, and the optimal growth conditions were established to be at pH 4 and 30 degrees C. Fermented liquid of the strain is neither disease-causing nor inhibitory to rice seedling emergence, but rather improves rice seedling and root growth and enhances rice detoxification ability under Cd stress. Thus, the Cd-resistant fungus CN35 has the potential to treat Cd-polluted rice paddies.

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