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Photosynthetic gas exchange responses of Swietenia macrophylla King and Melia azedarach L. plantations under drought conditions
BACKGROUND: The environmental stresses caused by climate change have become more severe in recent decades, affecting tree growth and physiology. Tropical forests have great potential for global carbon sequestration. However, they suffer from heavy rainfall and prolonged dry periods due to climate ch...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer Berlin Heidelberg
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5712295/ https://www.ncbi.nlm.nih.gov/pubmed/29198038 http://dx.doi.org/10.1186/s40529-017-0212-8 |
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author | Jhou, Hong-Chyi Wang, Ya-Nan Wu, Chung-Shien Yu, Jui-Chu Chen, Chung-I |
author_facet | Jhou, Hong-Chyi Wang, Ya-Nan Wu, Chung-Shien Yu, Jui-Chu Chen, Chung-I |
author_sort | Jhou, Hong-Chyi |
collection | PubMed |
description | BACKGROUND: The environmental stresses caused by climate change have become more severe in recent decades, affecting tree growth and physiology. Tropical forests have great potential for global carbon sequestration. However, they suffer from heavy rainfall and prolonged dry periods due to climate change. Swietenia macrophylla King and Melia azedarach L. are economically valuable trees that are widely planted in southern Taiwan. Plantations are exposed to either prolonged dry periods or heavy rainfall within the seasons of tropical monsoon areas. Photo-physiological comparisons may provide information that can improve management of S. macrophylla and M. azedarach plantations in tropical regions. RESULTS: Both species exhibited a midday depression in leaf photosynthesis regardless of the season. The net photosynthetic rate (P (N)), stomatal conductance (g (s)), and transpiration rate (E) in the dry season all significantly decreased in both tree species. In addition, M. azedarach used water more efficiently than did S. macrophylla during the dry season, but S. macrophylla had higher P (N) compared with that in M. azedarach during the wet season. Temperature and vapor pressure deficit influenced P (N) variation in S. macrophylla and M. azedarach, respectively. Our data suggested that the P (N) and g (s) of M. azedarach, but not of S. macrophylla, were linearly correlated during the dry season. The reduction of the leaf area was more sever in M. azedarach than in S. macrophylla, thus preventing water loss more efficiently. CONCLUSIONS: M. azedarach adapted to drought by reducing total leaf area and maintaining higher P (N), g (s), E, and WUE compared with those measured in S. macrophylla during the dry season. M. azedarach is more drought adaptation and more suitable for both humid and semi-humid areas than S. macrophylla, whereas the latter should be limited to more humid areas. |
format | Online Article Text |
id | pubmed-5712295 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Springer Berlin Heidelberg |
record_format | MEDLINE/PubMed |
spelling | pubmed-57122952017-12-07 Photosynthetic gas exchange responses of Swietenia macrophylla King and Melia azedarach L. plantations under drought conditions Jhou, Hong-Chyi Wang, Ya-Nan Wu, Chung-Shien Yu, Jui-Chu Chen, Chung-I Bot Stud Original Article BACKGROUND: The environmental stresses caused by climate change have become more severe in recent decades, affecting tree growth and physiology. Tropical forests have great potential for global carbon sequestration. However, they suffer from heavy rainfall and prolonged dry periods due to climate change. Swietenia macrophylla King and Melia azedarach L. are economically valuable trees that are widely planted in southern Taiwan. Plantations are exposed to either prolonged dry periods or heavy rainfall within the seasons of tropical monsoon areas. Photo-physiological comparisons may provide information that can improve management of S. macrophylla and M. azedarach plantations in tropical regions. RESULTS: Both species exhibited a midday depression in leaf photosynthesis regardless of the season. The net photosynthetic rate (P (N)), stomatal conductance (g (s)), and transpiration rate (E) in the dry season all significantly decreased in both tree species. In addition, M. azedarach used water more efficiently than did S. macrophylla during the dry season, but S. macrophylla had higher P (N) compared with that in M. azedarach during the wet season. Temperature and vapor pressure deficit influenced P (N) variation in S. macrophylla and M. azedarach, respectively. Our data suggested that the P (N) and g (s) of M. azedarach, but not of S. macrophylla, were linearly correlated during the dry season. The reduction of the leaf area was more sever in M. azedarach than in S. macrophylla, thus preventing water loss more efficiently. CONCLUSIONS: M. azedarach adapted to drought by reducing total leaf area and maintaining higher P (N), g (s), E, and WUE compared with those measured in S. macrophylla during the dry season. M. azedarach is more drought adaptation and more suitable for both humid and semi-humid areas than S. macrophylla, whereas the latter should be limited to more humid areas. Springer Berlin Heidelberg 2017-12-02 /pmc/articles/PMC5712295/ /pubmed/29198038 http://dx.doi.org/10.1186/s40529-017-0212-8 Text en © The Author(s) 2017 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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. |
spellingShingle | Original Article Jhou, Hong-Chyi Wang, Ya-Nan Wu, Chung-Shien Yu, Jui-Chu Chen, Chung-I Photosynthetic gas exchange responses of Swietenia macrophylla King and Melia azedarach L. plantations under drought conditions |
title | Photosynthetic gas exchange responses of Swietenia macrophylla King and Melia azedarach L. plantations under drought conditions |
title_full | Photosynthetic gas exchange responses of Swietenia macrophylla King and Melia azedarach L. plantations under drought conditions |
title_fullStr | Photosynthetic gas exchange responses of Swietenia macrophylla King and Melia azedarach L. plantations under drought conditions |
title_full_unstemmed | Photosynthetic gas exchange responses of Swietenia macrophylla King and Melia azedarach L. plantations under drought conditions |
title_short | Photosynthetic gas exchange responses of Swietenia macrophylla King and Melia azedarach L. plantations under drought conditions |
title_sort | photosynthetic gas exchange responses of swietenia macrophylla king and melia azedarach l. plantations under drought conditions |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5712295/ https://www.ncbi.nlm.nih.gov/pubmed/29198038 http://dx.doi.org/10.1186/s40529-017-0212-8 |
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