Differences in osmotic adjustment, foliar abscisic acid dynamics, and stomatal regulation between an isohydric and anisohydric woody angiosperm during drought

Nolan, RH; Tarin, T; Santini, NS; McAdam, SAM; Ruman, R; Eamus, D

Differences in osmotic adjustment, foliar abscisic acid dynamics, and stomatal regulation between an isohydric and anisohydric woody angiosperm during drought

Nolan, RH

Tarin, T Santini, NS

McAdam, SAM Ruman, R Eamus, D

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Publication Type:: Journal Article
Citation:: Plant Cell and Environment, 2017, 40 (12), pp. 3122 - 3134
Issue Date:: 2017-12-01

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Field	Value	Language
dc.contributor.author	Nolan, RH https://orcid.org/0000-0001-9277-5142	en_US
dc.contributor.author	Tarin, T	en_US
dc.contributor.author	Santini, NS https://orcid.org/0000-0002-8319-8862	en_US
dc.contributor.author	McAdam, SAM	en_US
dc.contributor.author	Ruman, R	en_US
dc.contributor.author	Eamus, D https://orcid.org/0000-0003-2765-8040	en_US
dc.date.available	2017-09-20	en_US
dc.date.issued	2017-12-01	en_US
dc.identifier.citation	Plant Cell and Environment, 2017, 40 (12), pp. 3122 - 3134	en_US
dc.identifier.issn	0140-7791	en_US
dc.identifier.uri	http://hdl.handle.net/10453/120457
dc.description.abstract	© 2017 John Wiley & Sons Ltd Species are often classified along a continuum from isohydric to anisohydric, with isohydric species exhibiting tighter regulation of leaf water potential through stomatal closure in response to drought. We investigated plasticity in stomatal regulation in an isohydric (Eucalyptus camaldulensis) and an anisohydric (Acacia aptaneura) angiosperm species subject to repeated drying cycles. We also assessed foliar abscisic acid (ABA) content dynamics, aboveground/belowground biomass allocation and nonstructural carbohydrates. The anisohydric species exhibited large plasticity in the turgor loss point (ΨTLP), with plants subject to repeated drying exhibiting lower ΨTLP and correspondingly larger stomatal conductance at low water potential, compared to plants not previously exposed to drought. The anisohydric species exhibited a switch from ABA to water potential-driven stomatal closure during drought, a response previously only reported for anisohydric gymnosperms. The isohydric species showed little osmotic adjustment, with no evidence of switching to water potential-driven stomatal closure, but did exhibit increased root:shoot ratios. There were no differences in carbohydrate depletion between species. We conclude that a large range in ΨTLP and biphasic ABA dynamics are indicative of anisohydric species, and these traits are associated with exposure to low minimum foliar water potential, dense sapwood and large resistance to xylem embolism.	en_US
dc.relation	http://purl.org/au-research/grants/arc/DP140101150
dc.relation.ispartof	Plant Cell and Environment	en_US
dc.relation.isbasedon	10.1111/pce.13077	en_US
dc.subject.classification	Plant Biology & Botany	en_US
dc.subject.mesh	Acacia	en_US
dc.subject.mesh	Eucalyptus	en_US
dc.subject.mesh	Seeds	en_US
dc.subject.mesh	Plant Leaves	en_US
dc.subject.mesh	Water	en_US
dc.subject.mesh	Abscisic Acid	en_US
dc.subject.mesh	Desiccation	en_US
dc.subject.mesh	Environment	en_US
dc.subject.mesh	Biomass	en_US
dc.subject.mesh	Plant Transpiration	en_US
dc.subject.mesh	Osmosis	en_US
dc.subject.mesh	Plant Stomata	en_US
dc.subject.mesh	Droughts	en_US
dc.subject.mesh	Magnoliopsida	en_US
dc.title	Differences in osmotic adjustment, foliar abscisic acid dynamics, and stomatal regulation between an isohydric and anisohydric woody angiosperm during drought	en_US
dc.type	Journal Article
utslib.citation.volume	12	en_US
utslib.citation.volume	40	en_US
utslib.for	0601 Biochemistry and Cell Biology	en_US
utslib.for	0701 Agriculture, Land and Farm Management	en_US
utslib.for	06 Biological Sciences	en_US
utslib.for	07 Agricultural and Veterinary Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	closed_access
pubs.issue	12	en_US
pubs.publication-status	Published	en_US
pubs.volume	40	en_US

Abstract:

© 2017 John Wiley & Sons Ltd Species are often classified along a continuum from isohydric to anisohydric, with isohydric species exhibiting tighter regulation of leaf water potential through stomatal closure in response to drought. We investigated plasticity in stomatal regulation in an isohydric (Eucalyptus camaldulensis) and an anisohydric (Acacia aptaneura) angiosperm species subject to repeated drying cycles. We also assessed foliar abscisic acid (ABA) content dynamics, aboveground/belowground biomass allocation and nonstructural carbohydrates. The anisohydric species exhibited large plasticity in the turgor loss point (ΨTLP), with plants subject to repeated drying exhibiting lower ΨTLP and correspondingly larger stomatal conductance at low water potential, compared to plants not previously exposed to drought. The anisohydric species exhibited a switch from ABA to water potential-driven stomatal closure during drought, a response previously only reported for anisohydric gymnosperms. The isohydric species showed little osmotic adjustment, with no evidence of switching to water potential-driven stomatal closure, but did exhibit increased root:shoot ratios. There were no differences in carbohydrate depletion between species. We conclude that a large range in ΨTLP and biphasic ABA dynamics are indicative of anisohydric species, and these traits are associated with exposure to low minimum foliar water potential, dense sapwood and large resistance to xylem embolism.

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http://hdl.handle.net/10453/120457