Summer drought alters carbon allocation to roots and root respiration in mountain grassland
Drought affects the carbon (C) source and sink activities of plant organs, with potential consequences for belowground C allocation, a key process of the terrestrial C cycle. The responses of belowground C allocation dynamics to drought are so far poorly understood. We combined experimental rain exc...
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description | Drought affects the carbon (C) source and sink activities of plant organs, with potential consequences for belowground C allocation, a key process of the terrestrial C cycle. The responses of belowground C allocation dynamics to drought are so far poorly understood. We combined experimental rain exclusion with¹³C pulse labelling in a mountain meadow to analyse the effects of summer drought on the dynamics of belowground allocation of recently assimilated C and how it is partitioned among different carbohydrate pools and root respiration. Severe soil moisture deficit decreased the ecosystem C uptake and the amounts and velocity of C allocated from shoots to roots. However, the proportion of recently assimilated C translocated belowground remained unaffected by drought. Reduced root respiration, reflecting reduced C demand under drought, was increasingly sustained by C reserves, whilst recent assimilates were preferentially allocated to root storage and an enlarged pool of osmotically active compounds. Our results indicate that under drought conditions the usage of recent photosynthates is shifted from metabolic activity to osmotic adjustment and storage compounds. |
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The responses of belowground C allocation dynamics to drought are so far poorly understood. We combined experimental rain exclusion with¹³C pulse labelling in a mountain meadow to analyse the effects of summer drought on the dynamics of belowground allocation of recently assimilated C and how it is partitioned among different carbohydrate pools and root respiration. Severe soil moisture deficit decreased the ecosystem C uptake and the amounts and velocity of C allocated from shoots to roots. However, the proportion of recently assimilated C translocated belowground remained unaffected by drought. Reduced root respiration, reflecting reduced C demand under drought, was increasingly sustained by C reserves, whilst recent assimilates were preferentially allocated to root storage and an enlarged pool of osmotically active compounds. 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New Phytologist © 2014 New Phytologist Trust.</rights><rights>Copyright © 2015 New Phytologist Trust</rights><rights>2014. This article is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). 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The responses of belowground C allocation dynamics to drought are so far poorly understood. We combined experimental rain exclusion with¹³C pulse labelling in a mountain meadow to analyse the effects of summer drought on the dynamics of belowground allocation of recently assimilated C and how it is partitioned among different carbohydrate pools and root respiration. Severe soil moisture deficit decreased the ecosystem C uptake and the amounts and velocity of C allocated from shoots to roots. However, the proportion of recently assimilated C translocated belowground remained unaffected by drought. Reduced root respiration, reflecting reduced C demand under drought, was increasingly sustained by C reserves, whilst recent assimilates were preferentially allocated to root storage and an enlarged pool of osmotically active compounds. Our results indicate that under drought conditions the usage of recent photosynthates is shifted from metabolic activity to osmotic adjustment and storage compounds.</description><subject>13C pulse labelling</subject><subject>Altitude</subject><subject>Austria</subject><subject>belowground carbon allocation</subject><subject>Body organs</subject><subject>carbohydrate pools</subject><subject>Carbohydrates</subject><subject>Carbohydrates - analysis</subject><subject>Carbon</subject><subject>Carbon - metabolism</subject><subject>Carbon dioxide</subject><subject>Carbon Dioxide - metabolism</subject><subject>Carbon Isotopes</subject><subject>Cell Respiration</subject><subject>Drought</subject><subject>Droughts</subject><subject>Dynamics</subject><subject>ecosystems</subject><subject>Grassland</subject><subject>Grassland soils</subject><subject>Grasslands</subject><subject>Labeling</subject><subject>meadows</subject><subject>Microclimate</subject><subject>Mountains</subject><subject>Organs</subject><subject>osmotic adjustment</subject><subject>Photosynthates</subject><subject>Plant organs</subject><subject>Plant roots</subject><subject>Plant Roots - metabolism</subject><subject>Plant Shoots - metabolism</subject><subject>Plants</subject><subject>Rain</subject><subject>Respiration</subject><subject>root respiration</subject><subject>Roots</subject><subject>Seasons</subject><subject>Shoots</subject><subject>Soil</subject><subject>Soil moisture</subject><subject>Soil respiration</subject><subject>soil water deficit</subject><subject>Starches</subject><subject>Storage</subject><subject>Summer</subject><subject>Temperature</subject><subject>Terrestrial environments</subject><subject>Time Factors</subject><subject>Tracer bullets</subject><subject>Uptake</subject><issn>0028-646X</issn><issn>1469-8137</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><sourceid>24P</sourceid><sourceid>EIF</sourceid><recordid>eNqNkl1rFDEUhoModlu98A_ogDf1YrY5-ZrMjSBFrVBUqAXBi5DJZnazzEzGJGPZf2-60y4qFMxFckKe9-Wck4PQC8BLyOtsGDdLoMDEI7TIe11KoNVjtMCYyFIw8f0IHce4xRjXXJCn6IhwKjmRbIF-XE19b0OxCn5ab1Khu2RDLIwOjR_yrfNGJ5fD5IvgfYqFHlb7qAg2ji7Mr24oej8NSedgHXSMXcaeoSet7qJ9fneeoOsP77-dX5SXXz5-On93WRpBqSh5xQ203GhTA5aVrCxlBnRtLK3blmmQQgCsGGuobXAlcduYlpBGtryStub0BL2dfcep6e3K2CEF3akxuF6HnfLaqb9fBrdRa_9LMYppLWk2OL0zCP7nZGNSvYvGdrkI66eoQNSMY-CU_QfKSfZkAjL6-h9066cw5E4owoFKKfE--QcpEIyxCoMgmXozUyb4GINtD9UBVrczoPIMqP0MZPbln-04kPefnoGzGbhxnd097KQ-f724t1zOim1MPhwUg70ZN7vkO792OXGCuaK3HlUWvJoFrfZKr4OL6vqK5BZiDLIiEtPfUNHVTQ</recordid><startdate>201502</startdate><enddate>201502</enddate><creator>Hasibeder, Roland</creator><creator>Fuchslueger, Lucia</creator><creator>Richter, Andreas</creator><creator>Bahn, Michael</creator><general>Academic Press</general><general>New Phytologist Trust</general><general>Wiley Subscription Services, Inc</general><general>BlackWell Publishing Ltd</general><scope>FBQ</scope><scope>24P</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QO</scope><scope>7SN</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>H95</scope><scope>L.G</scope><scope>M7N</scope><scope>P64</scope><scope>RC3</scope><scope>7X8</scope><scope>7S9</scope><scope>L.6</scope><scope>5PM</scope></search><sort><creationdate>201502</creationdate><title>Summer drought alters carbon allocation to roots and root respiration in mountain grassland</title><author>Hasibeder, Roland ; Fuchslueger, Lucia ; Richter, Andreas ; Bahn, Michael</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c6336-575c1f5cac9108787e34c1a9ce39ff4a186611d44b3eb0780fbcf22b8f578e953</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>13C pulse labelling</topic><topic>Altitude</topic><topic>Austria</topic><topic>belowground carbon allocation</topic><topic>Body organs</topic><topic>carbohydrate pools</topic><topic>Carbohydrates</topic><topic>Carbohydrates - analysis</topic><topic>Carbon</topic><topic>Carbon - metabolism</topic><topic>Carbon dioxide</topic><topic>Carbon Dioxide - metabolism</topic><topic>Carbon Isotopes</topic><topic>Cell Respiration</topic><topic>Drought</topic><topic>Droughts</topic><topic>Dynamics</topic><topic>ecosystems</topic><topic>Grassland</topic><topic>Grassland soils</topic><topic>Grasslands</topic><topic>Labeling</topic><topic>meadows</topic><topic>Microclimate</topic><topic>Mountains</topic><topic>Organs</topic><topic>osmotic adjustment</topic><topic>Photosynthates</topic><topic>Plant organs</topic><topic>Plant roots</topic><topic>Plant Roots - metabolism</topic><topic>Plant Shoots - metabolism</topic><topic>Plants</topic><topic>Rain</topic><topic>Respiration</topic><topic>root respiration</topic><topic>Roots</topic><topic>Seasons</topic><topic>Shoots</topic><topic>Soil</topic><topic>Soil moisture</topic><topic>Soil respiration</topic><topic>soil water deficit</topic><topic>Starches</topic><topic>Storage</topic><topic>Summer</topic><topic>Temperature</topic><topic>Terrestrial environments</topic><topic>Time Factors</topic><topic>Tracer bullets</topic><topic>Uptake</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hasibeder, Roland</creatorcontrib><creatorcontrib>Fuchslueger, Lucia</creatorcontrib><creatorcontrib>Richter, Andreas</creatorcontrib><creatorcontrib>Bahn, Michael</creatorcontrib><collection>AGRIS</collection><collection>Wiley Online Library Open Access</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Biotechnology Research Abstracts</collection><collection>Ecology Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Genetics Abstracts</collection><collection>MEDLINE - Academic</collection><collection>AGRICOLA</collection><collection>AGRICOLA - Academic</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>The New phytologist</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hasibeder, Roland</au><au>Fuchslueger, Lucia</au><au>Richter, Andreas</au><au>Bahn, Michael</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Summer drought alters carbon allocation to roots and root respiration in mountain grassland</atitle><jtitle>The New phytologist</jtitle><addtitle>New Phytol</addtitle><date>2015-02</date><risdate>2015</risdate><volume>205</volume><issue>3</issue><spage>1117</spage><epage>1127</epage><pages>1117-1127</pages><issn>0028-646X</issn><eissn>1469-8137</eissn><abstract>Drought affects the carbon (C) source and sink activities of plant organs, with potential consequences for belowground C allocation, a key process of the terrestrial C cycle. The responses of belowground C allocation dynamics to drought are so far poorly understood. We combined experimental rain exclusion with¹³C pulse labelling in a mountain meadow to analyse the effects of summer drought on the dynamics of belowground allocation of recently assimilated C and how it is partitioned among different carbohydrate pools and root respiration. Severe soil moisture deficit decreased the ecosystem C uptake and the amounts and velocity of C allocated from shoots to roots. However, the proportion of recently assimilated C translocated belowground remained unaffected by drought. Reduced root respiration, reflecting reduced C demand under drought, was increasingly sustained by C reserves, whilst recent assimilates were preferentially allocated to root storage and an enlarged pool of osmotically active compounds. Our results indicate that under drought conditions the usage of recent photosynthates is shifted from metabolic activity to osmotic adjustment and storage compounds.</abstract><cop>England</cop><pub>Academic Press</pub><pmid>25385284</pmid><doi>10.1111/nph.13146</doi><tpages>11</tpages><oa>free_for_read</oa></addata></record> |
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subjects | 13C pulse labelling Altitude Austria belowground carbon allocation Body organs carbohydrate pools Carbohydrates Carbohydrates - analysis Carbon Carbon - metabolism Carbon dioxide Carbon Dioxide - metabolism Carbon Isotopes Cell Respiration Drought Droughts Dynamics ecosystems Grassland Grassland soils Grasslands Labeling meadows Microclimate Mountains Organs osmotic adjustment Photosynthates Plant organs Plant roots Plant Roots - metabolism Plant Shoots - metabolism Plants Rain Respiration root respiration Roots Seasons Shoots Soil Soil moisture Soil respiration soil water deficit Starches Storage Summer Temperature Terrestrial environments Time Factors Tracer bullets Uptake |
title | Summer drought alters carbon allocation to roots and root respiration in mountain grassland |
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