Abstract
In this study, the effects of siderophores produced by six bacteria on mycelium growth, Cd and Pb accumulation, lipid peroxidation, protein content and antioxidant enzyme in Oudemansiella radicata were investigated in Cd and Pb-containing liquid medium. The results showed that inoculation with siderophore-containing filtrates (SCF) partly enhanced the growth of O. radicata after 15 days, with 0.8–32.4% biomass increase for Cd and 0.7–20.8% for Pb compared to control(s), which lacked siderophore. The maximum enhancement for accumulation were found to be confined to Bacillus sp. FFQ2(s) (26.5%) for Cd and Pseudomonas sp. CY63(s) (158.9%) for Pb. A significant decrease in MDA content indicated that lipid peroxidation in O. radicata was alleviated by siderophores. Besides, antioxidant enzyme SOD and POD activities also displayed obviously decrease in SCF-treated mycelium compared to control(s) treatment, while CAT activity did not present significant change. Protein level in O. radicata treated by SCF increased from 0.3 to 138.0% for Cd and from 10.9 to 107.1% for Pb compared to control(s). Therefore, the present work suggests that microbial siderophores can reduce the toxicity of metals to mycelium and then alleviate heavy metals-inducing oxidative stress in O. radicata.
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Acknowledgments
This study was financially supported by the NSFC (No.41171253), the National 863 High Technology Research and Development Program of China (No. 2006AA06Z361), and Science and Technology Development Projiect of Longquanyi District Aro-technical Extension Centre, Chengdu. The authors wish to thank Professor Guanglei Cheng and Dong Yu from Sichuan University for their technical assistance.
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Cao, Yr., Zhang, Xy., Deng, Jy. et al. Lead and cadmium-induced oxidative stress impacting mycelial growth of Oudemansiella radicata in liquid medium alleviated by microbial siderophores. World J Microbiol Biotechnol 28, 1727–1737 (2012). https://doi.org/10.1007/s11274-011-0983-0
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DOI: https://doi.org/10.1007/s11274-011-0983-0