ORIGINAL RESEARCH
Screening and Identifying a Cadmium-resistant Fungus and Characterizing its Cadmium Adsorption
Yanan Deng1, Lifeng Wang1, Kun Luo2, Di Peng1, Huidan Jiang1,
Chenzhong Jin3, Xiaomao Zhou1, Lianyang Bai1
 
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1Hunan Agricultural Biotechnology Research Center, Changsha, 410125, Hunan,China
2College of Plant Protection, Hunan Agricultural University, Changsha, 410125, Hunan, China
3
Collaborative Innovation Center for Field Weeds Control, Loudi, 417000, Hunan, China
Online publish date: 2017-05-05
Publish date: 2017-05-26
Submission date: 2016-10-21
Final revision date: 2016-12-08
Acceptance date: 2016-12-12
 
Pol. J. Environ. Stud. 2017;26(3):1011–1021
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ABSTRACT
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 β-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 24ºC and 37ºC, and the optimal growth conditions were established to be at pH 4 and 30ºC. 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.
eISSN:2083-5906
ISSN:1230-1485