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Comparing Hydraulics Between Two Grapevine Cultivars Reveals Differences in Stomatal Regulation Under Water Stress and Exogenous ABA Applications

Hydraulics of plants that have different strategies of stomatal regulation under water stress are relatively poorly understood. We explore how root and shoot hydraulics, stomatal conductance (g(s)), leaf and root aquaporin (AQP) expression, and abscisic acid (ABA) concentration in leaf xylem sap ([A...

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Autores principales: Dayer, Silvina, Scharwies, Johannes D., Ramesh, Sunita A., Sullivan, Wendy, Doerflinger, Franziska C., Pagay, Vinay, Tyerman, Stephen D.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7316991/
https://www.ncbi.nlm.nih.gov/pubmed/32636852
http://dx.doi.org/10.3389/fpls.2020.00705
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author Dayer, Silvina
Scharwies, Johannes D.
Ramesh, Sunita A.
Sullivan, Wendy
Doerflinger, Franziska C.
Pagay, Vinay
Tyerman, Stephen D.
author_facet Dayer, Silvina
Scharwies, Johannes D.
Ramesh, Sunita A.
Sullivan, Wendy
Doerflinger, Franziska C.
Pagay, Vinay
Tyerman, Stephen D.
author_sort Dayer, Silvina
collection PubMed
description Hydraulics of plants that have different strategies of stomatal regulation under water stress are relatively poorly understood. We explore how root and shoot hydraulics, stomatal conductance (g(s)), leaf and root aquaporin (AQP) expression, and abscisic acid (ABA) concentration in leaf xylem sap ([ABA](xylemsap)) may be coordinated under mild water stress and exogenous ABA applications in two Vitis vinifera L. cultivars traditionally classified as near-isohydric (Grenache) and near-anisohydric (Syrah). Under water stress, Grenache exhibited stronger adjustments of plant and root hydraulic conductances and greater stomatal sensitivity to [ABA](xylemsap) than Syrah resulting in greater conservation of soil moisture but not necessarily more isohydric behavior. Correlations between leaf (Ψ(leaf)) and predawn (Ψ(PD)) water potentials between cultivars suggested a “hydrodynamic” behavior rather than a particular iso-anisohydric classification. A significant decrease of Ψ(leaf) in well-watered ABA-fed vines supported a role of ABA in the soil-leaf hydraulic pathway to regulate g(s). Correlations between leaf and root AQPs expression levels under water deficit could explain the response of leaf (K(leaf)) and root (Lp(r)) hydraulic conductances in both cultivars. Additional studies under a wider range of soil water deficits are required to explore the possible differential regulation of g(s) and plant hydraulics in different cultivars and experimental conditions.
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spelling pubmed-73169912020-07-06 Comparing Hydraulics Between Two Grapevine Cultivars Reveals Differences in Stomatal Regulation Under Water Stress and Exogenous ABA Applications Dayer, Silvina Scharwies, Johannes D. Ramesh, Sunita A. Sullivan, Wendy Doerflinger, Franziska C. Pagay, Vinay Tyerman, Stephen D. Front Plant Sci Plant Science Hydraulics of plants that have different strategies of stomatal regulation under water stress are relatively poorly understood. We explore how root and shoot hydraulics, stomatal conductance (g(s)), leaf and root aquaporin (AQP) expression, and abscisic acid (ABA) concentration in leaf xylem sap ([ABA](xylemsap)) may be coordinated under mild water stress and exogenous ABA applications in two Vitis vinifera L. cultivars traditionally classified as near-isohydric (Grenache) and near-anisohydric (Syrah). Under water stress, Grenache exhibited stronger adjustments of plant and root hydraulic conductances and greater stomatal sensitivity to [ABA](xylemsap) than Syrah resulting in greater conservation of soil moisture but not necessarily more isohydric behavior. Correlations between leaf (Ψ(leaf)) and predawn (Ψ(PD)) water potentials between cultivars suggested a “hydrodynamic” behavior rather than a particular iso-anisohydric classification. A significant decrease of Ψ(leaf) in well-watered ABA-fed vines supported a role of ABA in the soil-leaf hydraulic pathway to regulate g(s). Correlations between leaf and root AQPs expression levels under water deficit could explain the response of leaf (K(leaf)) and root (Lp(r)) hydraulic conductances in both cultivars. Additional studies under a wider range of soil water deficits are required to explore the possible differential regulation of g(s) and plant hydraulics in different cultivars and experimental conditions. Frontiers Media S.A. 2020-06-19 /pmc/articles/PMC7316991/ /pubmed/32636852 http://dx.doi.org/10.3389/fpls.2020.00705 Text en Copyright © 2020 Dayer, Scharwies, Ramesh, Sullivan, Doerflinger, Pagay and Tyerman. 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
Dayer, Silvina
Scharwies, Johannes D.
Ramesh, Sunita A.
Sullivan, Wendy
Doerflinger, Franziska C.
Pagay, Vinay
Tyerman, Stephen D.
Comparing Hydraulics Between Two Grapevine Cultivars Reveals Differences in Stomatal Regulation Under Water Stress and Exogenous ABA Applications
title Comparing Hydraulics Between Two Grapevine Cultivars Reveals Differences in Stomatal Regulation Under Water Stress and Exogenous ABA Applications
title_full Comparing Hydraulics Between Two Grapevine Cultivars Reveals Differences in Stomatal Regulation Under Water Stress and Exogenous ABA Applications
title_fullStr Comparing Hydraulics Between Two Grapevine Cultivars Reveals Differences in Stomatal Regulation Under Water Stress and Exogenous ABA Applications
title_full_unstemmed Comparing Hydraulics Between Two Grapevine Cultivars Reveals Differences in Stomatal Regulation Under Water Stress and Exogenous ABA Applications
title_short Comparing Hydraulics Between Two Grapevine Cultivars Reveals Differences in Stomatal Regulation Under Water Stress and Exogenous ABA Applications
title_sort comparing hydraulics between two grapevine cultivars reveals differences in stomatal regulation under water stress and exogenous aba applications
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7316991/
https://www.ncbi.nlm.nih.gov/pubmed/32636852
http://dx.doi.org/10.3389/fpls.2020.00705
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