Effect of heavy metal on survival of certain groups of indigenous soil microbial population
Heavy metal pollution of soil is known to adversely effect microbial activities at elevated concentration. However, response of indigenous soil bacterial population to added heavy metal and metal combinations is poorly understood. In the present study salts of heavy metals like Cu, Cd, Cr, Hg, Mn, N...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Joint Coordination Centre of the World Bank assisted National Agricultural Research Programme (NARP)
2005-09-01
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| Series: | Journal of Applied Sciences and Environmental Management |
| Online Access: | https://www.ajol.info/index.php/jasem/article/view/17267 |
| _version_ | 1797227865324912640 |
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| author | Iqbal Ahma S Hayat A Ahmad A Inam Samiullah |
| author_facet | Iqbal Ahma S Hayat A Ahmad A Inam Samiullah |
| author_sort | Iqbal Ahma |
| collection | DOAJ |
| description | Heavy metal pollution of soil is known to adversely effect microbial activities at elevated concentration. However, response of indigenous soil bacterial population to added heavy metal and metal combinations is poorly understood. In the present study salts of heavy metals like Cu, Cd, Cr, Hg, Mn, Ni, Pb and Zn were added in soil under laboratory conditions with different concentrations (50, 100, 150 and 200 μg/g of soil) and sufficient moisture. The microcosm were stored at 28 ± 1 °C for 28 days. Viable count of aerobic heterotrophs, asymbiotic nitrogen fixers and actinomycetes were determined at different time intervals (0, 7, 14, 21 and 28 days of incubation) using the plate dilution method. Aerobic-heterotrophic bacterial population were more sensitive to metal groups like Ni and Cd followed by Cu, Cd, Hg, Mn, Cr and Zn. Similarly a symbiotic nitrogen fixers showed higher sensitivity to metal groups like Cd, Pb, Hg followed by Cu, Cr, Mn, Ni and Zn. Actinomycetes were found most sensitive. Metal toxicity was higher for Pb, Mn, Ni followed by Cd, Hg, Cr and least to Cu and Zn. Toxicity of heavy metal was concentration as well as time dependent. Loss of microbial diversity is evident as we move towards higher concentration of heavy metal in soil. Further, experimentation is needed to understand the genetic diversity of the sensitive and metal tolerant microbial population and metal-microbe interaction under natural condition in soil.
Journal of Applied Sciences and Environmental Management Vol. 9(1) 2005: 115-121 |
| first_indexed | 2024-04-24T14:47:35Z |
| format | Article |
| id | doaj.art-e5585bb636c74204bff3e8f1fe0a1785 |
| institution | Directory Open Access Journal |
| issn | 2659-1502 2659-1499 |
| language | English |
| last_indexed | 2024-04-24T14:47:35Z |
| publishDate | 2005-09-01 |
| publisher | Joint Coordination Centre of the World Bank assisted National Agricultural Research Programme (NARP) |
| record_format | Article |
| series | Journal of Applied Sciences and Environmental Management |
| spelling | doaj.art-e5585bb636c74204bff3e8f1fe0a17852024-04-02T19:54:49ZengJoint Coordination Centre of the World Bank assisted National Agricultural Research Programme (NARP)Journal of Applied Sciences and Environmental Management2659-15022659-14992005-09-019110.4314/jasem.v9i1.17267Effect of heavy metal on survival of certain groups of indigenous soil microbial populationIqbal Ahma0S Hayat1A Ahmad2A Inam3 Samiullah4Department of Agricultural Microbiology, Aligarh Muslim University, Aligarh 20200, IndiaDepartment of Botany, Aligarh Muslim University, Aligarh 20200, IndiaDepartment of Botany, Aligarh Muslim University, Aligarh 20200, IndiaDepartment of Botany, Aligarh Muslim University, Aligarh 20200, IndiaDepartment of Botany, Aligarh Muslim University, Aligarh 20200, IndiaHeavy metal pollution of soil is known to adversely effect microbial activities at elevated concentration. However, response of indigenous soil bacterial population to added heavy metal and metal combinations is poorly understood. In the present study salts of heavy metals like Cu, Cd, Cr, Hg, Mn, Ni, Pb and Zn were added in soil under laboratory conditions with different concentrations (50, 100, 150 and 200 μg/g of soil) and sufficient moisture. The microcosm were stored at 28 ± 1 °C for 28 days. Viable count of aerobic heterotrophs, asymbiotic nitrogen fixers and actinomycetes were determined at different time intervals (0, 7, 14, 21 and 28 days of incubation) using the plate dilution method. Aerobic-heterotrophic bacterial population were more sensitive to metal groups like Ni and Cd followed by Cu, Cd, Hg, Mn, Cr and Zn. Similarly a symbiotic nitrogen fixers showed higher sensitivity to metal groups like Cd, Pb, Hg followed by Cu, Cr, Mn, Ni and Zn. Actinomycetes were found most sensitive. Metal toxicity was higher for Pb, Mn, Ni followed by Cd, Hg, Cr and least to Cu and Zn. Toxicity of heavy metal was concentration as well as time dependent. Loss of microbial diversity is evident as we move towards higher concentration of heavy metal in soil. Further, experimentation is needed to understand the genetic diversity of the sensitive and metal tolerant microbial population and metal-microbe interaction under natural condition in soil. Journal of Applied Sciences and Environmental Management Vol. 9(1) 2005: 115-121https://www.ajol.info/index.php/jasem/article/view/17267 |
| spellingShingle | Iqbal Ahma S Hayat A Ahmad A Inam Samiullah Effect of heavy metal on survival of certain groups of indigenous soil microbial population Journal of Applied Sciences and Environmental Management |
| title | Effect of heavy metal on survival of certain groups of indigenous soil microbial population |
| title_full | Effect of heavy metal on survival of certain groups of indigenous soil microbial population |
| title_fullStr | Effect of heavy metal on survival of certain groups of indigenous soil microbial population |
| title_full_unstemmed | Effect of heavy metal on survival of certain groups of indigenous soil microbial population |
| title_short | Effect of heavy metal on survival of certain groups of indigenous soil microbial population |
| title_sort | effect of heavy metal on survival of certain groups of indigenous soil microbial population |
| url | https://www.ajol.info/index.php/jasem/article/view/17267 |
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