Microbial growth and carbon use efficiency in the rhizosphere and root-free soil
Plant-microbial interactions alter C and N balance in the rhizosphere and affect the microbial carbon use efficiency (CUE)-the fundamental characteristic of microbial metabolism. Estimation of CUE in microbial hotspots with high dynamics of activity and changes of microbial physiological state from...
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| Veröffentlicht in: | PloS one 2014-04, Vol.9 (4), p.e93282-e93282 |
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| creator | Blagodatskaya, Evgenia Blagodatsky, Sergey Anderson, Traute-Heidi Kuzyakov, Yakov |
| description | Plant-microbial interactions alter C and N balance in the rhizosphere and affect the microbial carbon use efficiency (CUE)-the fundamental characteristic of microbial metabolism. Estimation of CUE in microbial hotspots with high dynamics of activity and changes of microbial physiological state from dormancy to activity is a challenge in soil microbiology. We analyzed respiratory activity, microbial DNA content and CUE by manipulation the C and nutrients availability in the soil under Beta vulgaris. All measurements were done in root-free and rhizosphere soil under steady-state conditions and during microbial growth induced by addition of glucose. Microorganisms in the rhizosphere and root-free soil differed in their CUE dynamics due to varying time delays between respiration burst and DNA increase. Constant CUE in an exponentially-growing microbial community in rhizosphere demonstrated the balanced growth. In contrast, the CUE in the root-free soil increased more than three times at the end of exponential growth and was 1.5 times higher than in the rhizosphere. Plants alter the dynamics of microbial CUE by balancing the catabolic and anabolic processes, which were decoupled in the root-free soil. The effects of N and C availability on CUE in rhizosphere and root-free soil are discussed. |
| doi_str_mv | 10.1371/journal.pone.0093282 |
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Estimation of CUE in microbial hotspots with high dynamics of activity and changes of microbial physiological state from dormancy to activity is a challenge in soil microbiology. We analyzed respiratory activity, microbial DNA content and CUE by manipulation the C and nutrients availability in the soil under Beta vulgaris. All measurements were done in root-free and rhizosphere soil under steady-state conditions and during microbial growth induced by addition of glucose. Microorganisms in the rhizosphere and root-free soil differed in their CUE dynamics due to varying time delays between respiration burst and DNA increase. Constant CUE in an exponentially-growing microbial community in rhizosphere demonstrated the balanced growth. In contrast, the CUE in the root-free soil increased more than three times at the end of exponential growth and was 1.5 times higher than in the rhizosphere. Plants alter the dynamics of microbial CUE by balancing the catabolic and anabolic processes, which were decoupled in the root-free soil. 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This is an open-access article distributed under the terms of the Creative Commons Attribution License: http://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 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Estimation of CUE in microbial hotspots with high dynamics of activity and changes of microbial physiological state from dormancy to activity is a challenge in soil microbiology. We analyzed respiratory activity, microbial DNA content and CUE by manipulation the C and nutrients availability in the soil under Beta vulgaris. All measurements were done in root-free and rhizosphere soil under steady-state conditions and during microbial growth induced by addition of glucose. Microorganisms in the rhizosphere and root-free soil differed in their CUE dynamics due to varying time delays between respiration burst and DNA increase. Constant CUE in an exponentially-growing microbial community in rhizosphere demonstrated the balanced growth. In contrast, the CUE in the root-free soil increased more than three times at the end of exponential growth and was 1.5 times higher than in the rhizosphere. Plants alter the dynamics of microbial CUE by balancing the catabolic and anabolic processes, which were decoupled in the root-free soil. The effects of N and C availability on CUE in rhizosphere and root-free soil are discussed.</description><subject>Analysis</subject><subject>Beta vulgaris - metabolism</subject><subject>Biochemistry</subject><subject>Biology and Life Sciences</subject><subject>Biomass</subject><subject>Carbon</subject><subject>Carbon - metabolism</subject><subject>Carbon Dioxide - chemistry</subject><subject>Deoxyribonucleic acid</subject><subject>DNA</subject><subject>DNA, Bacterial - genetics</subject><subject>Dormancy</subject><subject>Earth Sciences</subject><subject>Ecology and Environmental Sciences</subject><subject>Ecosystem</subject><subject>Ecosystem biology</subject><subject>Ecosystems</subject><subject>Efficiency</subject><subject>Famine</subject><subject>Glucose</subject><subject>Glucose - chemistry</subject><subject>Glucose metabolism</subject><subject>Growth rate</subject><subject>Habitats</subject><subject>Metabolism</subject><subject>Microbial Interactions</subject><subject>Microbiology</subject><subject>Microorganisms</subject><subject>Mineralization</subject><subject>Nitrogen - 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Academic</collection><collection>PubMed Central (Full Participant titles)</collection><collection>DOAJ Directory of Open Access Journals</collection><jtitle>PloS one</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Blagodatskaya, Evgenia</au><au>Blagodatsky, Sergey</au><au>Anderson, Traute-Heidi</au><au>Kuzyakov, Yakov</au><au>Blanchard, Jeffrey L.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Microbial growth and carbon use efficiency in the rhizosphere and root-free soil</atitle><jtitle>PloS one</jtitle><addtitle>PLoS One</addtitle><date>2014-04-01</date><risdate>2014</risdate><volume>9</volume><issue>4</issue><spage>e93282</spage><epage>e93282</epage><pages>e93282-e93282</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>Plant-microbial interactions alter C and N balance in the rhizosphere and affect the microbial carbon use efficiency (CUE)-the fundamental characteristic of microbial metabolism. Estimation of CUE in microbial hotspots with high dynamics of activity and changes of microbial physiological state from dormancy to activity is a challenge in soil microbiology. We analyzed respiratory activity, microbial DNA content and CUE by manipulation the C and nutrients availability in the soil under Beta vulgaris. All measurements were done in root-free and rhizosphere soil under steady-state conditions and during microbial growth induced by addition of glucose. Microorganisms in the rhizosphere and root-free soil differed in their CUE dynamics due to varying time delays between respiration burst and DNA increase. Constant CUE in an exponentially-growing microbial community in rhizosphere demonstrated the balanced growth. In contrast, the CUE in the root-free soil increased more than three times at the end of exponential growth and was 1.5 times higher than in the rhizosphere. Plants alter the dynamics of microbial CUE by balancing the catabolic and anabolic processes, which were decoupled in the root-free soil. The effects of N and C availability on CUE in rhizosphere and root-free soil are discussed.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>24722409</pmid><doi>10.1371/journal.pone.0093282</doi><oa>free_for_read</oa></addata></record> |
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| source | MEDLINE; DOAJ Directory of Open Access Journals; Public Library of Science (PLoS); EZB-FREE-00999 freely available EZB journals; PubMed Central; Free Full-Text Journals in Chemistry |
| subjects | Analysis Beta vulgaris - metabolism Biochemistry Biology and Life Sciences Biomass Carbon Carbon - metabolism Carbon Dioxide - chemistry Deoxyribonucleic acid DNA DNA, Bacterial - genetics Dormancy Earth Sciences Ecology and Environmental Sciences Ecosystem Ecosystem biology Ecosystems Efficiency Famine Glucose Glucose - chemistry Glucose metabolism Growth rate Habitats Metabolism Microbial Interactions Microbiology Microorganisms Mineralization Nitrogen - chemistry Nutrients Nutrients in soil Physical Sciences Physiology Plant Roots - metabolism Respiration Rhizosphere Rhizosphere microorganisms Science Soil - chemistry Soil analysis Soil conditions Soil dynamics Soil Microbiology Soil nutrients Soil sciences Soils Time Factors Timing |
| title | Microbial growth and carbon use efficiency in the rhizosphere and root-free soil |
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