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Effect of Graded Doses of Heavy Metals on the Radial Growth Rate of Hyphomycetous Fungi from Mangrove Sediments of the Qua Iboe Estuary, Nigeria

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Abstract
Toxicity and heavy metal tolerance potentials of hyphomycetous fungi from epipellic sediments of the Qua Iboe Estuary, Nigeria were investigated ex situ in laboratory microcosms. Indigenous fungi were exposed to Pb, Zn, Ni, Cu and Cr for 90 days following sediment simulation with varying concentrations of the appropriate metallic salts. Growth pattern after acclimation revealed that Aspergillus glaucus ndash; ESM7 exhibited tolerance to Cr, A. repens—ESM4 to Zn and A. niger—ESM10 to Cu. Fusarium semitectum—ESM18 tolerated Ni and Penicillium digitatum—ESM8 resisted toxicity due to Pb. However results of the toxicity assay showed that the radial growth rate of A. glaucus—ESM7 was retarded by 60 mgl−1 of Cr, while that of A. repens—ESM4 in 328 mgl−1 of Zn and Penicillium digitatum—ESM8 in 140 mgl−1 of Pb were apparently enhanced by the metals. On the other hand Ni at 241 mgl−1 was toxic and highly inhibitory to F. semitectum—ESM18 while 83 mglminus;1 of Cu significantly (Students t—test, P = 0.05) enhanced the growth of A. niger—ESM10 when compared with the control. Based on these findings A. niger may be regarded as a promising myco-remediation agent for the removal of Cu from metal contaminated environment. It is also suggestive that because of the growth enhancing effect of Zn and Pb on A. repens—ESM4 and Penicillium digitatum—ESM8 minimal concentrations of the metals may plausibly be incorporated into mycological media for quick recovery of the moulds. On the other hand because of its toxic effect on Fusarium semitectum—ESM18, Ni may be adapted as an excellent biocide component for the formulation of fungicidal preparations against plant diseases caused by fusaria provided that the acceptable background level of Ni is not exceeded. However, more detailed information is required in order to optimize the conditions for maximum utilization of these metals and hyphomycetous fungi in useful environmental and biotechnological activities.
Author(s)
Joeseph P.EssienGodwin E.UdofiaEdu InamKim, Kyoung-Woong
Issued Date
2010-12
Type
Article
DOI
10.1080/12269328.2010.10541321
URI
https://scholar.gist.ac.kr/handle/local/16506
Publisher
Taylor & Francis Group, LLC.
Citation
Geosystem Engineering, v.13, no.4, pp.139 - 146
ISSN
1226-9328
Appears in Collections:
Department of Environment and Energy Engineering > 1. Journal Articles
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