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| DOI: | 10.1016/j.soilbio.2004.10.020 |
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| Web URL(s): | http://www.sciencedirect.com/science/article/pii/S003807170400416X
Last checked: 03/27/2012
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| Publication Type:
| Refereed |
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| Author(s): | Shaw, Liz J.;
Burns, Richard G. |
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| Author Affiliation: | Shaw: Imperial College London, Wye Campus, Department of Agricultural Sciences, Wye, Kent, UK; Burns: School of Land and Food Sciences, The University of Queensland, Brisbane, Queensland, Australia |
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| Title: | Rhizodeposits of Trifolium pratense and Lolium perenne: Their comparative effects on 2,4-D mineralization in two contrasting soils |
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| Source: | Soil Biology & Biochemistry. Vol. 37, No. 5, May 2005, p. 995-1002. |
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| Publishing Information: | Oxford, United Kingdom: Pergamon Press |
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| # of Pages: | 8 |
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| Keywords: | TIC Keywords: 2,4-D; Comparisons; Lolium perenne; Mineralization; Rhizodeposition; Trifolium pratense
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| Abstract/Contents: | "Rhizosphere enhanced biodegradation of organic pollutants has been reported frequently and a stimulatory role for specific components of rhizodeposits postulated. As rhizodeposit composition is a function of plant species and soil type, we compared the effect of Lolium perenne and Trifolium pratense grown in two different soils (a sandy silt loam: pH 4, 2.8% OC, no previous 2,4-D exposure and a silt loam: pH 6.5, 4.3% OC, previous 2,4-D exposure) on the mineralization of the herbicide 2,4-D (2,4-dichlorophenoxyacetic acid). We investigated the relationship of mineralization kinetics to dehydrogenase activity, most probable number of 2,4-D degraders (MPN2,4-D) and 2,4-D degrader composition (using sequence analysis of the gene encoding α-ketoglutarate/2,4-D dioxygenase (tfdA)). There were significant (P<0.01) plant-soil interaction effects on MPN2,4-D and 2,4-D mineralization kinetics (e.g. T. pratense rhizodeposits enhanced the maximum mineralization rate by 30% in the acid sandy silt loam soil, but not in the neutral silt loam soil). Differences in mineralization kinetics could not be ascribed to 2,4-D degrader composition as both soils had tfdA sequences which clustered with tfdAs representative of two distinct classes of 2,4-D degrader: canonical R. eutropha JMP134-like and oligotrophic α-proteobacterial-like. Other explanations for the differential rhizodeposit effect between soils and plants (e.g. nutrient competition effects) are discussed. Our findings stress that complexity of soil-plant-microbe interactions in the rhizosphere make the occurrence and extent of rhizosphere-enhanced xenobiotic degradation difficult to predict." |
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| Language: | English |
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| References: | 36 |
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| Note: | Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Shaw, L. J., and R. G. Burns. 2005. Rhizodeposits of Trifolium pratense and Lolium perenne: Their comparative effects on 2,4-D mineralization in two contrasting soils. Soil Biol. Biochem. 37(5):p. 995-1002. |
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| DOI: 10.1016/j.soilbio.2004.10.020 |
| Web URL(s):
http://www.sciencedirect.com/science/article/pii/S003807170400416X
Last checked: 03/27/2012
Access conditions: Item is within a limited-access website
http://pdn.sciencedirect.com/science?_ob=MiamiImageURL&cid=271195&_user=1111158&_pii=S003807170400416X&_check=y&_origin=browse&_zone=rslt_list_item&_coverDate=2005-05-31&wchp=dGLzVBA-zSkWA&md5=f9fdde78786072771-s2.0-S003807170400416X-main.pdf
Last checked: 03/27/2012
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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