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Chiral monoterpenes reveal forest emission mechanisms and drought responses

Monoterpenes (C(10)H(16)) are emitted in large quantities by vegetation to the atmosphere (>100 TgC year(−1)), where they readily react with hydroxyl radicals and ozone to form new particles and, hence, clouds, affecting the Earth’s radiative budget and, thereby, climate change(1–3). Although mos...

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Autores principales: Byron, Joseph, Kreuzwieser, Juergen, Purser, Gemma, van Haren, Joost, Ladd, S. Nemiah, Meredith, Laura K., Werner, Christiane, Williams, Jonathan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9452298/
https://www.ncbi.nlm.nih.gov/pubmed/36071188
http://dx.doi.org/10.1038/s41586-022-05020-5
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author Byron, Joseph
Kreuzwieser, Juergen
Purser, Gemma
van Haren, Joost
Ladd, S. Nemiah
Meredith, Laura K.
Werner, Christiane
Williams, Jonathan
author_facet Byron, Joseph
Kreuzwieser, Juergen
Purser, Gemma
van Haren, Joost
Ladd, S. Nemiah
Meredith, Laura K.
Werner, Christiane
Williams, Jonathan
author_sort Byron, Joseph
collection PubMed
description Monoterpenes (C(10)H(16)) are emitted in large quantities by vegetation to the atmosphere (>100 TgC year(−1)), where they readily react with hydroxyl radicals and ozone to form new particles and, hence, clouds, affecting the Earth’s radiative budget and, thereby, climate change(1–3). Although most monoterpenes exist in two chiral mirror-image forms termed enantiomers, these (+) and (−) forms are rarely distinguished in measurement or modelling studies(4–6). Therefore, the individual formation pathways of monoterpene enantiomers in plants and their ecological functions are poorly understood. Here we present enantiomerically separated atmospheric monoterpene and isoprene data from an enclosed tropical rainforest ecosystem in the absence of ultraviolet light and atmospheric oxidation chemistry, during a four-month controlled drought and rewetting experiment(7). Surprisingly, the emitted enantiomers showed distinct diel emission peaks, which responded differently to progressive drying. Isotopic labelling established that vegetation emitted mainly de novo-synthesized (−)-α-pinene, whereas (+)-α-pinene was emitted from storage pools. As drought progressed, the source of (−)-α-pinene emissions shifted to storage pools, favouring cloud formation. Pre-drought mixing ratios of both α-pinene enantiomers correlated better with other monoterpenes than with each other, indicating different enzymatic controls. These results show that enantiomeric distribution is key to understanding the underlying processes driving monoterpene emissions from forest ecosystems and predicting atmospheric feedbacks in response to climate change.
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spelling pubmed-94522982022-09-09 Chiral monoterpenes reveal forest emission mechanisms and drought responses Byron, Joseph Kreuzwieser, Juergen Purser, Gemma van Haren, Joost Ladd, S. Nemiah Meredith, Laura K. Werner, Christiane Williams, Jonathan Nature Article Monoterpenes (C(10)H(16)) are emitted in large quantities by vegetation to the atmosphere (>100 TgC year(−1)), where they readily react with hydroxyl radicals and ozone to form new particles and, hence, clouds, affecting the Earth’s radiative budget and, thereby, climate change(1–3). Although most monoterpenes exist in two chiral mirror-image forms termed enantiomers, these (+) and (−) forms are rarely distinguished in measurement or modelling studies(4–6). Therefore, the individual formation pathways of monoterpene enantiomers in plants and their ecological functions are poorly understood. Here we present enantiomerically separated atmospheric monoterpene and isoprene data from an enclosed tropical rainforest ecosystem in the absence of ultraviolet light and atmospheric oxidation chemistry, during a four-month controlled drought and rewetting experiment(7). Surprisingly, the emitted enantiomers showed distinct diel emission peaks, which responded differently to progressive drying. Isotopic labelling established that vegetation emitted mainly de novo-synthesized (−)-α-pinene, whereas (+)-α-pinene was emitted from storage pools. As drought progressed, the source of (−)-α-pinene emissions shifted to storage pools, favouring cloud formation. Pre-drought mixing ratios of both α-pinene enantiomers correlated better with other monoterpenes than with each other, indicating different enzymatic controls. These results show that enantiomeric distribution is key to understanding the underlying processes driving monoterpene emissions from forest ecosystems and predicting atmospheric feedbacks in response to climate change. Nature Publishing Group UK 2022-09-07 2022 /pmc/articles/PMC9452298/ /pubmed/36071188 http://dx.doi.org/10.1038/s41586-022-05020-5 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Byron, Joseph
Kreuzwieser, Juergen
Purser, Gemma
van Haren, Joost
Ladd, S. Nemiah
Meredith, Laura K.
Werner, Christiane
Williams, Jonathan
Chiral monoterpenes reveal forest emission mechanisms and drought responses
title Chiral monoterpenes reveal forest emission mechanisms and drought responses
title_full Chiral monoterpenes reveal forest emission mechanisms and drought responses
title_fullStr Chiral monoterpenes reveal forest emission mechanisms and drought responses
title_full_unstemmed Chiral monoterpenes reveal forest emission mechanisms and drought responses
title_short Chiral monoterpenes reveal forest emission mechanisms and drought responses
title_sort chiral monoterpenes reveal forest emission mechanisms and drought responses
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9452298/
https://www.ncbi.nlm.nih.gov/pubmed/36071188
http://dx.doi.org/10.1038/s41586-022-05020-5
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