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Growth, Morphological, and Physiological Responses to Drought Stress in Bothriochloa ischaemum
Water shortage in the arid-semiarid regions of China seriously hampers ecosystem construction. Therefore, elucidation of the mechanisms by which vegetation in that area responds to drought stress may enable us to improve utilization of limited water resources and thus contend with the problem of dro...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Frontiers Media S.A.
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5323425/ https://www.ncbi.nlm.nih.gov/pubmed/28286507 http://dx.doi.org/10.3389/fpls.2017.00230 |
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author | Liu, Ying Li, Peng Xu, Guo Ce Xiao, Lie Ren, Zong Ping Li, Zhan Bin |
author_facet | Liu, Ying Li, Peng Xu, Guo Ce Xiao, Lie Ren, Zong Ping Li, Zhan Bin |
author_sort | Liu, Ying |
collection | PubMed |
description | Water shortage in the arid-semiarid regions of China seriously hampers ecosystem construction. Therefore, elucidation of the mechanisms by which vegetation in that area responds to drought stress may enable us to improve utilization of limited water resources and thus contend with the problem of drought and water shortage. We studied Bothriochloa ischaemum, a native grass species, conducted potting control tests to compare several indicators of B. ischaemum grown under three different moisture conditions (80%, 60%, 40% Field capacity represent sufficient water supply, mild water stress, and serious water stress, respectively). Plant response parameters measured included biomass accumulation, root morphology, transient water use efficiency (WUE), stable carbon isotope ratio (δ(13)C), and stable carbon isotope discrimination (Δ(13)C) of various plant organs and their interrelationships. B. ischaemum had the greatest WUE under mild drought stress. However, serious drought stress resulted in considerable decline in overall biomass but substantial increase in root-to-shoot ratio and fine-root biomass. Coarse-root biomass dropped appreciably, indicating that serious drought stress leads to allocation non-uniformity of the carbon “sink.” δ(13)C and Δ(13)C of stem correlated considerably with root morphology, suggesting the feasibility of characterizing WUE, biomass, and root morphology of B. ischaemum via the stable carbon isotope approach. Our evaluation of 21 drought resistance indicators of B. ischaemum showed that under a given moisture treatment gradient one can isolate an optimal indicator to express growth, morphology, and physiology, to improve the accuracy of depicting plant drought resistance and simplify the drought resistance indicator system. This study elucidates the response mechanism of B. ischaemum to drought stress and provides theoretical support to screening of drought-resistant plants across the arid-semiarid regions of China. |
format | Online Article Text |
id | pubmed-5323425 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-53234252017-03-10 Growth, Morphological, and Physiological Responses to Drought Stress in Bothriochloa ischaemum Liu, Ying Li, Peng Xu, Guo Ce Xiao, Lie Ren, Zong Ping Li, Zhan Bin Front Plant Sci Plant Science Water shortage in the arid-semiarid regions of China seriously hampers ecosystem construction. Therefore, elucidation of the mechanisms by which vegetation in that area responds to drought stress may enable us to improve utilization of limited water resources and thus contend with the problem of drought and water shortage. We studied Bothriochloa ischaemum, a native grass species, conducted potting control tests to compare several indicators of B. ischaemum grown under three different moisture conditions (80%, 60%, 40% Field capacity represent sufficient water supply, mild water stress, and serious water stress, respectively). Plant response parameters measured included biomass accumulation, root morphology, transient water use efficiency (WUE), stable carbon isotope ratio (δ(13)C), and stable carbon isotope discrimination (Δ(13)C) of various plant organs and their interrelationships. B. ischaemum had the greatest WUE under mild drought stress. However, serious drought stress resulted in considerable decline in overall biomass but substantial increase in root-to-shoot ratio and fine-root biomass. Coarse-root biomass dropped appreciably, indicating that serious drought stress leads to allocation non-uniformity of the carbon “sink.” δ(13)C and Δ(13)C of stem correlated considerably with root morphology, suggesting the feasibility of characterizing WUE, biomass, and root morphology of B. ischaemum via the stable carbon isotope approach. Our evaluation of 21 drought resistance indicators of B. ischaemum showed that under a given moisture treatment gradient one can isolate an optimal indicator to express growth, morphology, and physiology, to improve the accuracy of depicting plant drought resistance and simplify the drought resistance indicator system. This study elucidates the response mechanism of B. ischaemum to drought stress and provides theoretical support to screening of drought-resistant plants across the arid-semiarid regions of China. Frontiers Media S.A. 2017-02-24 /pmc/articles/PMC5323425/ /pubmed/28286507 http://dx.doi.org/10.3389/fpls.2017.00230 Text en Copyright © 2017 Liu, Li, Xu, Xiao, Ren and Li. 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) or licensor 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 Liu, Ying Li, Peng Xu, Guo Ce Xiao, Lie Ren, Zong Ping Li, Zhan Bin Growth, Morphological, and Physiological Responses to Drought Stress in Bothriochloa ischaemum |
title | Growth, Morphological, and Physiological Responses to Drought Stress in Bothriochloa ischaemum |
title_full | Growth, Morphological, and Physiological Responses to Drought Stress in Bothriochloa ischaemum |
title_fullStr | Growth, Morphological, and Physiological Responses to Drought Stress in Bothriochloa ischaemum |
title_full_unstemmed | Growth, Morphological, and Physiological Responses to Drought Stress in Bothriochloa ischaemum |
title_short | Growth, Morphological, and Physiological Responses to Drought Stress in Bothriochloa ischaemum |
title_sort | growth, morphological, and physiological responses to drought stress in bothriochloa ischaemum |
topic | Plant Science |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5323425/ https://www.ncbi.nlm.nih.gov/pubmed/28286507 http://dx.doi.org/10.3389/fpls.2017.00230 |
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