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Belowground carbon allocation, root trait plasticity, and productivity during drought and warming in a pasture grass
Sustaining grassland production in a changing climate requires an understanding of plant adaptation strategies, including trait plasticity under warmer and drier conditions. However, our knowledge to date disproportionately relies on aboveground responses, despite the importance of belowground trait...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Oxford University Press
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10084810/ https://www.ncbi.nlm.nih.gov/pubmed/36640126 http://dx.doi.org/10.1093/jxb/erad021 |
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author | Chandregowda, Manjunatha H Tjoelker, Mark G Pendall, Elise Zhang, Haiyang Churchill, Amber C Power, Sally A |
author_facet | Chandregowda, Manjunatha H Tjoelker, Mark G Pendall, Elise Zhang, Haiyang Churchill, Amber C Power, Sally A |
author_sort | Chandregowda, Manjunatha H |
collection | PubMed |
description | Sustaining grassland production in a changing climate requires an understanding of plant adaptation strategies, including trait plasticity under warmer and drier conditions. However, our knowledge to date disproportionately relies on aboveground responses, despite the importance of belowground traits in maintaining aboveground growth, especially in grazed systems. We subjected a perennial pasture grass, Festuca arundinacea, to year-round warming (+3 °C) and cool-season drought (60% rainfall reduction) in a factorial field experiment to test the hypotheses that: (i) drought and warming increase carbon allocation belowground and shift root traits towards greater resource acquisition and (ii) increased belowground carbon reserves support post-drought aboveground recovery. Drought and warming reduced plant production and biomass allocation belowground. Drought increased specific root length and reduced root diameter in warmed plots but increased root starch concentrations under ambient temperature. Higher diameter and soluble sugar concentrations of roots and starch storage in crowns explained aboveground production under climate extremes. However, the lack of association between post-drought aboveground biomass and belowground carbon and nitrogen reserves contrasted with our predictions. These findings demonstrate that root trait plasticity and belowground carbon reserves play a key role in aboveground production during climate stress, helping predict pasture responses and inform management decisions under future climates. |
format | Online Article Text |
id | pubmed-10084810 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Oxford University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-100848102023-04-11 Belowground carbon allocation, root trait plasticity, and productivity during drought and warming in a pasture grass Chandregowda, Manjunatha H Tjoelker, Mark G Pendall, Elise Zhang, Haiyang Churchill, Amber C Power, Sally A J Exp Bot Research Papers Sustaining grassland production in a changing climate requires an understanding of plant adaptation strategies, including trait plasticity under warmer and drier conditions. However, our knowledge to date disproportionately relies on aboveground responses, despite the importance of belowground traits in maintaining aboveground growth, especially in grazed systems. We subjected a perennial pasture grass, Festuca arundinacea, to year-round warming (+3 °C) and cool-season drought (60% rainfall reduction) in a factorial field experiment to test the hypotheses that: (i) drought and warming increase carbon allocation belowground and shift root traits towards greater resource acquisition and (ii) increased belowground carbon reserves support post-drought aboveground recovery. Drought and warming reduced plant production and biomass allocation belowground. Drought increased specific root length and reduced root diameter in warmed plots but increased root starch concentrations under ambient temperature. Higher diameter and soluble sugar concentrations of roots and starch storage in crowns explained aboveground production under climate extremes. However, the lack of association between post-drought aboveground biomass and belowground carbon and nitrogen reserves contrasted with our predictions. These findings demonstrate that root trait plasticity and belowground carbon reserves play a key role in aboveground production during climate stress, helping predict pasture responses and inform management decisions under future climates. Oxford University Press 2023-01-14 /pmc/articles/PMC10084810/ /pubmed/36640126 http://dx.doi.org/10.1093/jxb/erad021 Text en © The Author(s) 2023. Published by Oxford University Press on behalf of the Society for Experimental Biology. https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Papers Chandregowda, Manjunatha H Tjoelker, Mark G Pendall, Elise Zhang, Haiyang Churchill, Amber C Power, Sally A Belowground carbon allocation, root trait plasticity, and productivity during drought and warming in a pasture grass |
title | Belowground carbon allocation, root trait plasticity, and productivity during drought and warming in a pasture grass |
title_full | Belowground carbon allocation, root trait plasticity, and productivity during drought and warming in a pasture grass |
title_fullStr | Belowground carbon allocation, root trait plasticity, and productivity during drought and warming in a pasture grass |
title_full_unstemmed | Belowground carbon allocation, root trait plasticity, and productivity during drought and warming in a pasture grass |
title_short | Belowground carbon allocation, root trait plasticity, and productivity during drought and warming in a pasture grass |
title_sort | belowground carbon allocation, root trait plasticity, and productivity during drought and warming in a pasture grass |
topic | Research Papers |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10084810/ https://www.ncbi.nlm.nih.gov/pubmed/36640126 http://dx.doi.org/10.1093/jxb/erad021 |
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