Growth of streptomycetes in soil and their impact on bioremediation.
The impact of the extremely heavy metal resistant actinomycete Streptomyces mirabilis P16B-1 on heavy metal mobilization/stabilization, phytoremediation and stress level of plants was analyzed in the presence and absence of Sorghum bicolor in sterile microcosms containing highly metal contaminated or control soil. For control, a metal sensitive S. lividans TK24 was used. The metal contents with respect to the mobile and specifically adsorbed fractions of the contaminated soil were considerably decreased by addition of both, living and dead biomass of the strains, with the heavy metal resistant S. mirabilis P16B-1 showing considerably higher impact. Both strains could grow in control soil, while only S. mirabilis P16B-1 formed new tip growth in the metal contaminated soil. A plant growth promoting effect was visible for S. mirabilis P16B-1 in contaminated soil enhancing the dry weight of inoculated Sorghum plants. Thus, metal resistant strains like S. mirabilis P16B-1 are able to enhance phytoremediation of heavy metal contaminated soils.
Microbial Communication, Institute of Microbiology, Faculty of Biology and Pharmacy, Friedrich-Schiller-University, Jena, Germany.
Eileen
E
Schütze
Microbial Communication, Institute of Microbiology, Faculty of Biology and Pharmacy, Friedrich-Schiller-University, Jena, Germany.
Michael
M
Klose
Applied Geology, Institute of Geosciences, Faculty of Chemistry and Earth Sciences, Friedrich-Schiller-University, Jena, Germany.
Dirk
D
Merten
Centre for Electron Microscopy, Jena University Hospital, Jena, Germany.
Sandor
S
Nietzsche
Microbial Communication, Institute of Microbiology, Faculty of Biology and Pharmacy, Friedrich-Schiller-University, Jena, Germany.
Dominik
D
Senftleben
Bio Pilot Plant, Leibniz-Institute for Natural Product Research and Infection Biology - Hans-Knöll-Institute HKI, Jena, Germany.
Martin
M
Roth
Microbial Communication, Institute of Microbiology, Faculty of Biology and Pharmacy, Friedrich-Schiller-University, Jena, Germany. Electronic address: Erika.Kothe@uni-jena.de.
Erika
E
Kothe
D001673:Biodegradation, Environmental; D018533:Biomass; D002734:Chlorophyll / Q000737:chemistry / Q000378:metabolism; D004247:DNA / Q000737:chemistry / Q000235:genetics; D004785:Environmental Pollutants / Q000032:analysis / Q000633:toxicity; D005453:Fluorescence; D008670:Metals / Q000032:analysis / Q000633:toxicity; D008855:Microscopy, Electron, Scanning; D012988:Soil Microbiology; D045868:Sorghum / Q000235:genetics / Q000378:metabolism; D013302:Streptomyces / Q000254:growth & development* / Q000378:metabolism*
D004785:Environmental Pollutants; D008670:Metals; D002734:Chlorophyll; D004247:DNA
Bioremediation; Heavy metals; Phytoextraction; REE; Streptomycetes