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Drought Responses of Foliar Metabolites in Three Maize Hybrids Differing in Water Stress Tolerance

Maize (Zea mays L.) hybrids varying in drought tolerance were treated with water stress in controlled environments. Experiments were performed during vegetative growth and water was withheld for 19 days beginning 17 days after sowing. Genotypic comparisons used measured changes of leaf water potenti...

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Autores principales: Barnaby, Jinyoung Y., Kim, Moon, Bauchan, Gary, Bunce, James, Reddy, Vangimalla, Sicher, Richard Charles
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3797120/
https://www.ncbi.nlm.nih.gov/pubmed/24143208
http://dx.doi.org/10.1371/journal.pone.0077145
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author Barnaby, Jinyoung Y.
Kim, Moon
Bauchan, Gary
Bunce, James
Reddy, Vangimalla
Sicher, Richard Charles
author_facet Barnaby, Jinyoung Y.
Kim, Moon
Bauchan, Gary
Bunce, James
Reddy, Vangimalla
Sicher, Richard Charles
author_sort Barnaby, Jinyoung Y.
collection PubMed
description Maize (Zea mays L.) hybrids varying in drought tolerance were treated with water stress in controlled environments. Experiments were performed during vegetative growth and water was withheld for 19 days beginning 17 days after sowing. Genotypic comparisons used measured changes of leaf water potential or results were expressed by time of treatment. Total dry matter of the drought tolerant hybrid on the final harvest was 53% less than that of the intermediate and susceptible maize hybrids when plants were water sufficient. This showed that maize hybrids selected for extreme drought tolerance possessed a dwarf phenotype that affected soil water contents and leaf water potentials. Changes of shoot and root growth, leaf water potential, net photosynthesis and stomatal conductance in response to the time of water stress treatment were diminished when comparing the drought tolerant to the intermediate or susceptible maize hybrids. Genotypic differences were observed in 26 of 40 total foliar metabolites during water stress treatments. Hierarchical clustering revealed that the tolerant maize hybrid initiated the accumulation of stress related metabolites at higher leaf water potentials than either the susceptible or intermediate hybrids. Opposite results occurred when changes of metabolites in maize leaves were expressed temporally. The above results demonstrated that genotypic differences were readily observed by comparing maize hybrids differing in drought tolerance based on either time of treatment or measured leaf water potential. Current findings provided new and potentially important insights into the mechanisms of drought tolerance in maize.
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spelling pubmed-37971202013-10-18 Drought Responses of Foliar Metabolites in Three Maize Hybrids Differing in Water Stress Tolerance Barnaby, Jinyoung Y. Kim, Moon Bauchan, Gary Bunce, James Reddy, Vangimalla Sicher, Richard Charles PLoS One Research Article Maize (Zea mays L.) hybrids varying in drought tolerance were treated with water stress in controlled environments. Experiments were performed during vegetative growth and water was withheld for 19 days beginning 17 days after sowing. Genotypic comparisons used measured changes of leaf water potential or results were expressed by time of treatment. Total dry matter of the drought tolerant hybrid on the final harvest was 53% less than that of the intermediate and susceptible maize hybrids when plants were water sufficient. This showed that maize hybrids selected for extreme drought tolerance possessed a dwarf phenotype that affected soil water contents and leaf water potentials. Changes of shoot and root growth, leaf water potential, net photosynthesis and stomatal conductance in response to the time of water stress treatment were diminished when comparing the drought tolerant to the intermediate or susceptible maize hybrids. Genotypic differences were observed in 26 of 40 total foliar metabolites during water stress treatments. Hierarchical clustering revealed that the tolerant maize hybrid initiated the accumulation of stress related metabolites at higher leaf water potentials than either the susceptible or intermediate hybrids. Opposite results occurred when changes of metabolites in maize leaves were expressed temporally. The above results demonstrated that genotypic differences were readily observed by comparing maize hybrids differing in drought tolerance based on either time of treatment or measured leaf water potential. Current findings provided new and potentially important insights into the mechanisms of drought tolerance in maize. Public Library of Science 2013-10-15 /pmc/articles/PMC3797120/ /pubmed/24143208 http://dx.doi.org/10.1371/journal.pone.0077145 Text en https://creativecommons.org/publicdomain/zero/1.0/ This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.
spellingShingle Research Article
Barnaby, Jinyoung Y.
Kim, Moon
Bauchan, Gary
Bunce, James
Reddy, Vangimalla
Sicher, Richard Charles
Drought Responses of Foliar Metabolites in Three Maize Hybrids Differing in Water Stress Tolerance
title Drought Responses of Foliar Metabolites in Three Maize Hybrids Differing in Water Stress Tolerance
title_full Drought Responses of Foliar Metabolites in Three Maize Hybrids Differing in Water Stress Tolerance
title_fullStr Drought Responses of Foliar Metabolites in Three Maize Hybrids Differing in Water Stress Tolerance
title_full_unstemmed Drought Responses of Foliar Metabolites in Three Maize Hybrids Differing in Water Stress Tolerance
title_short Drought Responses of Foliar Metabolites in Three Maize Hybrids Differing in Water Stress Tolerance
title_sort drought responses of foliar metabolites in three maize hybrids differing in water stress tolerance
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3797120/
https://www.ncbi.nlm.nih.gov/pubmed/24143208
http://dx.doi.org/10.1371/journal.pone.0077145
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