Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of Graded Doses of Heavy Metals on the Radial Growth Rate of Hyphomycetous Fungi from Mangrove Sediments of the Qua Iboe Estuary, Nigeria
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.
Effect of Graded Doses of Heavy Metals on the Radial Growth Rate of Hyphomycetous Fungi from Mangrove Sediments of the Qua Iboe Estuary, Nigeria
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.
Effect of Graded Doses of Heavy Metals on the Radial Growth Rate of Hyphomycetous Fungi from Mangrove Sediments of the Qua Iboe Estuary, Nigeria
Essien, Joeseph P. (Autor:in) / Udofia, Godwin E. (Autor:in) / Inam, Edu (Autor:in) / Kim, Kyoung-Woong (Autor:in)
Geosystem Engineering ; 13 ; 139-146
01.12.2010
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
| Taylor & Francis Verlag | 2013