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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 ORCID: 0000-0002-9625-6750, Ruman, R and Eamus, D 2017 , 'Differences in osmotic adjustment, foliar abscisic acid dynamics, and stomatal regulation between an isohydric and anisohydric woody angiosperm during drought' , Plant, Cell and Environment, vol. 40, no. 12 , pp. 3122-3134 , doi: 10.1111/pce.13077.

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Abstract

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.

Item Type: Article
Authors/Creators:Nolan, RH and Tarin, T and Santini, NS and McAdam, SAM and Ruman, R and Eamus, D
Keywords: ABA, drought avoidant, drought tolerant, leaf shedding, storage carbohydrates, turgor loss point, water relations
Journal or Publication Title: Plant, Cell and Environment
Publisher: Blackwell Publishing Ltd
ISSN: 0140-7791
DOI / ID Number: 10.1111/pce.13077
Copyright Information:

Copyright 2017 John Wiley & Sons Ltd

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