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Elevated CO(2) enhanced water use efficiency of wheat to progressive drought stress but not on maize

Global rising atmospheric CO(2) concentration ([CO(2)]) and drought stress exert profound influences on crop growth and yield. The objective of the present study was to investigate the responses of leaf gas exchange and plant water use efficiency (WUE) of wheat (C3) and maize (C4) plants to progress...

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Autores principales: Cao, Qingjun, Li, Gang, Liu, Fulai
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9714360/
https://www.ncbi.nlm.nih.gov/pubmed/36466229
http://dx.doi.org/10.3389/fpls.2022.953712
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author Cao, Qingjun
Li, Gang
Liu, Fulai
author_facet Cao, Qingjun
Li, Gang
Liu, Fulai
author_sort Cao, Qingjun
collection PubMed
description Global rising atmospheric CO(2) concentration ([CO(2)]) and drought stress exert profound influences on crop growth and yield. The objective of the present study was to investigate the responses of leaf gas exchange and plant water use efficiency (WUE) of wheat (C3) and maize (C4) plants to progressive drought stress under ambient (a[CO(2)], 400 ppm) and elevated (e[CO(2)], 800 ppm) atmospheric CO(2) concentrations. The fraction of transpirable soil water (FTSW) was used to evaluate soil water status in the pots. Under non-drought stress, e[CO(2)] increased the net photosynthetic rate (A(n)) solely in wheat, and dry matter accumulation (DMA), whereas it decreased stomatal conductance (g (s)) and water consumption (WC), resulting in enhanced WUE by 27.82% for maize and 49.86% for wheat. After onset of progressive soil drying, maize plants in e[CO(2)] showed lower FTSW thresholds than wheat, at which e.g. g(s) (0.31 vs 0.40) and leaf relative water content (0.21 vs 0.43) starts to decrease, indicating e[CO(2)] conferred a greater drought resistance in maize. Under the combination of e[CO(2)] and drought stress, enhanced WUE was solely found in wheat, which is mainly associated with increased DMA and unaffected WC. These varied responses of leaf gas exchange and WUE between the two species to combined drought and e[CO(2)] suggest that specific water management strategies should be developed to optimize crop WUE for different species in a future drier and CO(2)-enriched environment.
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spelling pubmed-97143602022-12-02 Elevated CO(2) enhanced water use efficiency of wheat to progressive drought stress but not on maize Cao, Qingjun Li, Gang Liu, Fulai Front Plant Sci Plant Science Global rising atmospheric CO(2) concentration ([CO(2)]) and drought stress exert profound influences on crop growth and yield. The objective of the present study was to investigate the responses of leaf gas exchange and plant water use efficiency (WUE) of wheat (C3) and maize (C4) plants to progressive drought stress under ambient (a[CO(2)], 400 ppm) and elevated (e[CO(2)], 800 ppm) atmospheric CO(2) concentrations. The fraction of transpirable soil water (FTSW) was used to evaluate soil water status in the pots. Under non-drought stress, e[CO(2)] increased the net photosynthetic rate (A(n)) solely in wheat, and dry matter accumulation (DMA), whereas it decreased stomatal conductance (g (s)) and water consumption (WC), resulting in enhanced WUE by 27.82% for maize and 49.86% for wheat. After onset of progressive soil drying, maize plants in e[CO(2)] showed lower FTSW thresholds than wheat, at which e.g. g(s) (0.31 vs 0.40) and leaf relative water content (0.21 vs 0.43) starts to decrease, indicating e[CO(2)] conferred a greater drought resistance in maize. Under the combination of e[CO(2)] and drought stress, enhanced WUE was solely found in wheat, which is mainly associated with increased DMA and unaffected WC. These varied responses of leaf gas exchange and WUE between the two species to combined drought and e[CO(2)] suggest that specific water management strategies should be developed to optimize crop WUE for different species in a future drier and CO(2)-enriched environment. Frontiers Media S.A. 2022-11-17 /pmc/articles/PMC9714360/ /pubmed/36466229 http://dx.doi.org/10.3389/fpls.2022.953712 Text en Copyright © 2022 Cao, Li and Liu https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Plant Science
Cao, Qingjun
Li, Gang
Liu, Fulai
Elevated CO(2) enhanced water use efficiency of wheat to progressive drought stress but not on maize
title Elevated CO(2) enhanced water use efficiency of wheat to progressive drought stress but not on maize
title_full Elevated CO(2) enhanced water use efficiency of wheat to progressive drought stress but not on maize
title_fullStr Elevated CO(2) enhanced water use efficiency of wheat to progressive drought stress but not on maize
title_full_unstemmed Elevated CO(2) enhanced water use efficiency of wheat to progressive drought stress but not on maize
title_short Elevated CO(2) enhanced water use efficiency of wheat to progressive drought stress but not on maize
title_sort elevated co(2) enhanced water use efficiency of wheat to progressive drought stress but not on maize
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9714360/
https://www.ncbi.nlm.nih.gov/pubmed/36466229
http://dx.doi.org/10.3389/fpls.2022.953712
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