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Effects of Elevated Ozone Levels on Photosynthesis, Biomass and Non-structural Carbohydrates of Phoebe bournei and Phoebe zhennan in Subtropical China

To assess the impacts of ozone (O(3)) on carbon metabolism of subtropical broadleaved tree species, seedlings of Phoebe bournei and Phoebe zhennan were exposed to elevated O(3) levels in open-top chambers (OTCs) from June to November 2014. Three treatments were conducted in nine total OTCs, includin...

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Autores principales: Chen, Zhan, Cao, Jixin, Yu, Hao, Shang, He
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6284062/
https://www.ncbi.nlm.nih.gov/pubmed/30555502
http://dx.doi.org/10.3389/fpls.2018.01764
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author Chen, Zhan
Cao, Jixin
Yu, Hao
Shang, He
author_facet Chen, Zhan
Cao, Jixin
Yu, Hao
Shang, He
author_sort Chen, Zhan
collection PubMed
description To assess the impacts of ozone (O(3)) on carbon metabolism of subtropical broadleaved tree species, seedlings of Phoebe bournei and Phoebe zhennan were exposed to elevated O(3) levels in open-top chambers (OTCs) from June to November 2014. Three treatments were conducted in nine total OTCs, including charcoal-filter air (CF) as a control treatment, low O(3) treatment ‘O3-1’ (∼100 nl l(-1)), and high O(3) treatment ‘O3-2’ (∼150 nl l(-1)). Our findings demonstrated that elevated O(3) levels significantly decreased the net photosynthesis rates (P(n)) and leaf, root, and total biomass of both species, while it did not significantly affect the root/shoot ratio in P. bournei and P. zhennan. O3-1 treatments significantly increased water soluble carbohydrates (WSC) in leaves of both tree species, while only increased the total non-structural carbohydrates (TNC) and starch in leaves of P. bournei; effects on P. zhennan were equivalent in comparison to the control treatment (CF). Likewise, there was no effect of treatment on the polysaccharide content of both tree species. The contents of polysaccharide, starch contents in fine roots of both species, and TNC in fine roots of P. bournei increased significantly in O3-1 compared to CF. O3-2 treatment significantly decreased starch and TNC in the fine roots of P. bournei, and significantly decreased polysaccharide, starch, WSC, and TNC in the fine roots of P. zhennan. Elevated O(3) had no effects on leaf polysaccharide in both species, but O3-1 significantly increased polysaccharide in the fine roots of both species, and O3-1 significantly increased WSC in the leaves while decreased that in the fine roots of both species. These results suggested that elevated O(3) levels have significant impacts on the carbon metabolism of both tree species in our study, with differential responses between tree species and among leaves and roots.
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spelling pubmed-62840622018-12-14 Effects of Elevated Ozone Levels on Photosynthesis, Biomass and Non-structural Carbohydrates of Phoebe bournei and Phoebe zhennan in Subtropical China Chen, Zhan Cao, Jixin Yu, Hao Shang, He Front Plant Sci Plant Science To assess the impacts of ozone (O(3)) on carbon metabolism of subtropical broadleaved tree species, seedlings of Phoebe bournei and Phoebe zhennan were exposed to elevated O(3) levels in open-top chambers (OTCs) from June to November 2014. Three treatments were conducted in nine total OTCs, including charcoal-filter air (CF) as a control treatment, low O(3) treatment ‘O3-1’ (∼100 nl l(-1)), and high O(3) treatment ‘O3-2’ (∼150 nl l(-1)). Our findings demonstrated that elevated O(3) levels significantly decreased the net photosynthesis rates (P(n)) and leaf, root, and total biomass of both species, while it did not significantly affect the root/shoot ratio in P. bournei and P. zhennan. O3-1 treatments significantly increased water soluble carbohydrates (WSC) in leaves of both tree species, while only increased the total non-structural carbohydrates (TNC) and starch in leaves of P. bournei; effects on P. zhennan were equivalent in comparison to the control treatment (CF). Likewise, there was no effect of treatment on the polysaccharide content of both tree species. The contents of polysaccharide, starch contents in fine roots of both species, and TNC in fine roots of P. bournei increased significantly in O3-1 compared to CF. O3-2 treatment significantly decreased starch and TNC in the fine roots of P. bournei, and significantly decreased polysaccharide, starch, WSC, and TNC in the fine roots of P. zhennan. Elevated O(3) had no effects on leaf polysaccharide in both species, but O3-1 significantly increased polysaccharide in the fine roots of both species, and O3-1 significantly increased WSC in the leaves while decreased that in the fine roots of both species. These results suggested that elevated O(3) levels have significant impacts on the carbon metabolism of both tree species in our study, with differential responses between tree species and among leaves and roots. Frontiers Media S.A. 2018-11-30 /pmc/articles/PMC6284062/ /pubmed/30555502 http://dx.doi.org/10.3389/fpls.2018.01764 Text en Copyright © 2018 Chen, Cao, Yu and Shang. http://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
Chen, Zhan
Cao, Jixin
Yu, Hao
Shang, He
Effects of Elevated Ozone Levels on Photosynthesis, Biomass and Non-structural Carbohydrates of Phoebe bournei and Phoebe zhennan in Subtropical China
title Effects of Elevated Ozone Levels on Photosynthesis, Biomass and Non-structural Carbohydrates of Phoebe bournei and Phoebe zhennan in Subtropical China
title_full Effects of Elevated Ozone Levels on Photosynthesis, Biomass and Non-structural Carbohydrates of Phoebe bournei and Phoebe zhennan in Subtropical China
title_fullStr Effects of Elevated Ozone Levels on Photosynthesis, Biomass and Non-structural Carbohydrates of Phoebe bournei and Phoebe zhennan in Subtropical China
title_full_unstemmed Effects of Elevated Ozone Levels on Photosynthesis, Biomass and Non-structural Carbohydrates of Phoebe bournei and Phoebe zhennan in Subtropical China
title_short Effects of Elevated Ozone Levels on Photosynthesis, Biomass and Non-structural Carbohydrates of Phoebe bournei and Phoebe zhennan in Subtropical China
title_sort effects of elevated ozone levels on photosynthesis, biomass and non-structural carbohydrates of phoebe bournei and phoebe zhennan in subtropical china
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6284062/
https://www.ncbi.nlm.nih.gov/pubmed/30555502
http://dx.doi.org/10.3389/fpls.2018.01764
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