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Lack of hydraulic recovery as a cause of post‐drought foliage reduction and canopy decline in European beech

European beech (Fagus sylvatica) was among the most affected tree species during the severe 2018 European drought. It not only suffered from instant physiological stress but also showed severe symptoms of defoliation and canopy decline in the following year. To explore the underlying mechanisms, we...

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Autores principales: Arend, Matthias, Link, Roman Mathias, Zahnd, Cedric, Hoch, Günter, Schuldt, Bernhard, Kahmen, Ansgar
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9310744/
https://www.ncbi.nlm.nih.gov/pubmed/35238410
http://dx.doi.org/10.1111/nph.18065
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author Arend, Matthias
Link, Roman Mathias
Zahnd, Cedric
Hoch, Günter
Schuldt, Bernhard
Kahmen, Ansgar
author_facet Arend, Matthias
Link, Roman Mathias
Zahnd, Cedric
Hoch, Günter
Schuldt, Bernhard
Kahmen, Ansgar
author_sort Arend, Matthias
collection PubMed
description European beech (Fagus sylvatica) was among the most affected tree species during the severe 2018 European drought. It not only suffered from instant physiological stress but also showed severe symptoms of defoliation and canopy decline in the following year. To explore the underlying mechanisms, we used the Swiss‐Canopy‐Crane II site and studied in branches of healthy and symptomatic trees the repair of hydraulic function and concentration of carbohydrates during the 2018 drought and in 2019. We found loss of hydraulic conductance in 2018, which did not recover in 2019 in trees that developed defoliation symptoms in the year after drought. Reduced branch foliation in symptomatic trees was associated with a gradual decline in wood starch concentration throughout summer 2019. Visualization of water transport in healthy and symptomatic branches in the year after the drought confirmed the close relationship between xylem functionality and supported branch leaf area. Our findings showed that embolized xylem does not regain function in the season following a drought and that sustained branch hydraulic dysfunction is counterbalanced by the reduction in supported leaf area. It suggests acclimation of leaf development after drought to mitigate disturbances in canopy hydraulic function.
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spelling pubmed-93107442022-07-29 Lack of hydraulic recovery as a cause of post‐drought foliage reduction and canopy decline in European beech Arend, Matthias Link, Roman Mathias Zahnd, Cedric Hoch, Günter Schuldt, Bernhard Kahmen, Ansgar New Phytol Research European beech (Fagus sylvatica) was among the most affected tree species during the severe 2018 European drought. It not only suffered from instant physiological stress but also showed severe symptoms of defoliation and canopy decline in the following year. To explore the underlying mechanisms, we used the Swiss‐Canopy‐Crane II site and studied in branches of healthy and symptomatic trees the repair of hydraulic function and concentration of carbohydrates during the 2018 drought and in 2019. We found loss of hydraulic conductance in 2018, which did not recover in 2019 in trees that developed defoliation symptoms in the year after drought. Reduced branch foliation in symptomatic trees was associated with a gradual decline in wood starch concentration throughout summer 2019. Visualization of water transport in healthy and symptomatic branches in the year after the drought confirmed the close relationship between xylem functionality and supported branch leaf area. Our findings showed that embolized xylem does not regain function in the season following a drought and that sustained branch hydraulic dysfunction is counterbalanced by the reduction in supported leaf area. It suggests acclimation of leaf development after drought to mitigate disturbances in canopy hydraulic function. John Wiley and Sons Inc. 2022-03-23 2022-05 /pmc/articles/PMC9310744/ /pubmed/35238410 http://dx.doi.org/10.1111/nph.18065 Text en © 2022 The Authors. New Phytologist © 2022 New Phytologist Foundation https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research
Arend, Matthias
Link, Roman Mathias
Zahnd, Cedric
Hoch, Günter
Schuldt, Bernhard
Kahmen, Ansgar
Lack of hydraulic recovery as a cause of post‐drought foliage reduction and canopy decline in European beech
title Lack of hydraulic recovery as a cause of post‐drought foliage reduction and canopy decline in European beech
title_full Lack of hydraulic recovery as a cause of post‐drought foliage reduction and canopy decline in European beech
title_fullStr Lack of hydraulic recovery as a cause of post‐drought foliage reduction and canopy decline in European beech
title_full_unstemmed Lack of hydraulic recovery as a cause of post‐drought foliage reduction and canopy decline in European beech
title_short Lack of hydraulic recovery as a cause of post‐drought foliage reduction and canopy decline in European beech
title_sort lack of hydraulic recovery as a cause of post‐drought foliage reduction and canopy decline in european beech
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9310744/
https://www.ncbi.nlm.nih.gov/pubmed/35238410
http://dx.doi.org/10.1111/nph.18065
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