Abscisic acid mediates a divergence in the drought response of two conifers

Plant Physiology
Timothy J Brodribb, Scott A M McAdam

Abstract

During water stress, stomatal closure occurs as water tension and levels of abscisic acid (ABA) increase in the leaf, but the interaction between these two drivers of stomatal aperture is poorly understood. We investigate the dynamics of water potential, ABA, and stomatal conductance during the imposition of water stress on two drought-tolerant conifer species with contrasting stomatal behavior. Rapid rehydration of excised shoots was used as a means of differentiating the direct influences of ABA and water potential on stomatal closure. Pinus radiata (Pinaceae) was found to exhibit ABA-driven stomatal closure during water stress, resulting in strongly isohydric regulation of water loss. By contrast, stomatal closure in Callitris rhomboidea (Cupressaceae) was initiated by elevated foliar ABA, but sustained water stress saw a marked decline in ABA levels and a shift to water potential-driven stomatal closure. The transition from ABA to water potential as the primary driver of stomatal aperture allowed C. rhomboidea to rapidly recover gas exchange after water-stressed plants were rewatered, and was associated with a strongly anisohydric regulation of water loss. These two contrasting mechanisms of stomatal regulation function in ...Continue Reading

References

Feb 4, 2014·Tree Physiology·Elisabetta OddoAndrea Nardini
Nov 28, 2015·Tree Physiology·Heidi C ZimmerPatrick J Baker
Sep 24, 2014·Proceedings of the National Academy of Sciences of the United States of America·Timothy J BrodribbSamuel C V Martins
Jun 5, 2015·Tree Physiology·Timothy J Brodribb, Scott A M McAdam
Jun 4, 2016·Plant, Cell & Environment·Celia M Rodriguez-DominguezAntonio Diaz-Espejo
Aug 18, 2016·Plant, Cell & Environment·Timothy J BrodribbMadeline R Carins Murphy
Jan 4, 2017·Physiologia Plantarum·Hanan El Aou-OuadJosefina Bota
Jan 18, 2017·Journal of Integrative Plant Biology·Frances C SussmilchScott A M McAdam
Nov 28, 2017·Tree Physiology·Hagar FoxRakefet David-Schwartz
Nov 26, 2016·Tree Physiology·N Garcia-FornerJ Martínez-Vilalta
Jul 6, 2014·Plant, Cell & Environment·Scott A M McAdam, Timothy J Brodribb
Sep 1, 2019·Plant, Cell & Environment·Hans AmmitzbollJules S Freeman
Aug 24, 2018·Tree Physiology·Cecilia BrunettiMassimiliano Tattini
Jun 1, 2015·Functional Plant Biology : FPB·Abraham Blum
Feb 12, 2020·Functional Plant Biology : FPB·Jaymee R EncaboIl-Ryong Choi
Apr 1, 2015·Functional Plant Biology : FPB·Uri HochbergShimon Rachmilevitch
Apr 12, 2017·Tree Physiology·Patrick J MitchellTimothy J Brodribb

Citations

Jan 15, 2002·Plant Physiology·Hervé CochardThierry Améglio
Aug 17, 2005·The New Phytologist·M Rob G Roelfsema, Rainer Hedrich
Oct 13, 2005·The New Phytologist·Thomas N Buckley
Nov 23, 2006·Plant Physiology·Peter J Franks, Graham D Farquhar
Nov 18, 2008·Plant Physiology·Tim J Brodribb, Hervé Cochard
Jun 16, 2010·Plant, Cell & Environment·Gaëlle DamourLaurent Urban
Dec 18, 2010·Science·Tim J Brodribb, Scott A M McAdam
Apr 21, 2012·The Plant Cell·Scott A M McAdam, Timothy J Brodribb
Feb 21, 2013·The New Phytologist·Scott A M McAdam, Timothy J Brodribb

Related Concepts

Picea excelsa
Plant Stomata
Cupressaceae
Stomatal Closure
Calocedrus
Cardamine bulbosa
Contrast Used
Coniferophyta
Droughts
Abscisic Acid

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