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Dynamics of Foliar Responses to O(3) Stress as a Function of Phytotoxic O(3) Dose in Hybrid Poplar

With background concentrations having reached phytotoxic levels during the last century, tropospheric ozone (O(3)) has become a key climate change agent, counteracting carbon sequestration by forest ecosystems. One of the main knowledge gaps for implementing the recent O(3) flux-based critical level...

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Autores principales: Turc, Benjamin, Vollenweider, Pierre, Le Thiec, Didier, Gandin, Anthony, Schaub, Marcus, Cabané, Mireille, Jolivet, Yves
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8273248/
https://www.ncbi.nlm.nih.gov/pubmed/34262582
http://dx.doi.org/10.3389/fpls.2021.679852
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author Turc, Benjamin
Vollenweider, Pierre
Le Thiec, Didier
Gandin, Anthony
Schaub, Marcus
Cabané, Mireille
Jolivet, Yves
author_facet Turc, Benjamin
Vollenweider, Pierre
Le Thiec, Didier
Gandin, Anthony
Schaub, Marcus
Cabané, Mireille
Jolivet, Yves
author_sort Turc, Benjamin
collection PubMed
description With background concentrations having reached phytotoxic levels during the last century, tropospheric ozone (O(3)) has become a key climate change agent, counteracting carbon sequestration by forest ecosystems. One of the main knowledge gaps for implementing the recent O(3) flux-based critical levels (CLs) concerns the assessment of effective O(3) dose leading to adverse effects in plants. In this study, we investigate the dynamics of physiological, structural, and morphological responses induced by two levels of O(3) exposure (80 and 100 ppb) in the foliage of hybrid poplar, as a function of phytotoxic O(3) dose (POD(0)) and foliar developmental stage. After a latency period driven by foliar ontological development, the gas exchanges and chlorophyll content decreased with higher POD(0) monotonically. Hypersensitive response-like lesions appeared early during exposure and showed sigmoidal-like dynamics, varying according to leaf age. At current POD(1_SPEC) CL, notwithstanding the aforementioned reactions and initial visible injury to foliage, the treated poplars had still not shown any growth or biomass reduction. Hence, this study demonstrates the development of a complex syndrome of early reactions below the flux-based CL, with response dynamics closely determined by the foliar ontological stage and environmental conditions. General agreement with patterns observed in the field appears indicative of early O(3) impacts on processes relevant, e.g., biodiversity ecosystem services before those of economic significance – i.e., wood production, as targeted by flux-based CL.
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spelling pubmed-82732482021-07-13 Dynamics of Foliar Responses to O(3) Stress as a Function of Phytotoxic O(3) Dose in Hybrid Poplar Turc, Benjamin Vollenweider, Pierre Le Thiec, Didier Gandin, Anthony Schaub, Marcus Cabané, Mireille Jolivet, Yves Front Plant Sci Plant Science With background concentrations having reached phytotoxic levels during the last century, tropospheric ozone (O(3)) has become a key climate change agent, counteracting carbon sequestration by forest ecosystems. One of the main knowledge gaps for implementing the recent O(3) flux-based critical levels (CLs) concerns the assessment of effective O(3) dose leading to adverse effects in plants. In this study, we investigate the dynamics of physiological, structural, and morphological responses induced by two levels of O(3) exposure (80 and 100 ppb) in the foliage of hybrid poplar, as a function of phytotoxic O(3) dose (POD(0)) and foliar developmental stage. After a latency period driven by foliar ontological development, the gas exchanges and chlorophyll content decreased with higher POD(0) monotonically. Hypersensitive response-like lesions appeared early during exposure and showed sigmoidal-like dynamics, varying according to leaf age. At current POD(1_SPEC) CL, notwithstanding the aforementioned reactions and initial visible injury to foliage, the treated poplars had still not shown any growth or biomass reduction. Hence, this study demonstrates the development of a complex syndrome of early reactions below the flux-based CL, with response dynamics closely determined by the foliar ontological stage and environmental conditions. General agreement with patterns observed in the field appears indicative of early O(3) impacts on processes relevant, e.g., biodiversity ecosystem services before those of economic significance – i.e., wood production, as targeted by flux-based CL. Frontiers Media S.A. 2021-06-28 /pmc/articles/PMC8273248/ /pubmed/34262582 http://dx.doi.org/10.3389/fpls.2021.679852 Text en Copyright © 2021 Turc, Vollenweider, Le Thiec, Gandin, Schaub, Cabané and Jolivet. 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
Turc, Benjamin
Vollenweider, Pierre
Le Thiec, Didier
Gandin, Anthony
Schaub, Marcus
Cabané, Mireille
Jolivet, Yves
Dynamics of Foliar Responses to O(3) Stress as a Function of Phytotoxic O(3) Dose in Hybrid Poplar
title Dynamics of Foliar Responses to O(3) Stress as a Function of Phytotoxic O(3) Dose in Hybrid Poplar
title_full Dynamics of Foliar Responses to O(3) Stress as a Function of Phytotoxic O(3) Dose in Hybrid Poplar
title_fullStr Dynamics of Foliar Responses to O(3) Stress as a Function of Phytotoxic O(3) Dose in Hybrid Poplar
title_full_unstemmed Dynamics of Foliar Responses to O(3) Stress as a Function of Phytotoxic O(3) Dose in Hybrid Poplar
title_short Dynamics of Foliar Responses to O(3) Stress as a Function of Phytotoxic O(3) Dose in Hybrid Poplar
title_sort dynamics of foliar responses to o(3) stress as a function of phytotoxic o(3) dose in hybrid poplar
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8273248/
https://www.ncbi.nlm.nih.gov/pubmed/34262582
http://dx.doi.org/10.3389/fpls.2021.679852
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