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

Citation

Nolan, RH and Tarin, T and Santini, NS and McAdam, SAM and Ruman, R and Eamus, D, Differences in osmotic adjustment, foliar abscisic acid dynamics, and stomatal regulation between an isohydric and anisohydric woody angiosperm during drought, Plant, Cell and Environment, 40, (12) pp. 3122-3134. ISSN 0140-7791 (2017) [Refereed Article]

Copyright Statement

Copyright 2017 John Wiley & Sons Ltd

DOI: doi:10.1111/pce.13077

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 Details

Item Type:Refereed Article
Keywords:ABA, drought avoidant, drought tolerant, leaf shedding, storage carbohydrates, turgor loss point, water relations
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Physiology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Flora, Fauna and Biodiversity of environments not elsewhere classified
Author:McAdam, SAM (Dr Scott McAdam)
ID Code:125824
Year Published:2017
Web of Science® Times Cited:4
Deposited By:Plant Science
Deposited On:2018-05-08
Last Modified:2018-07-31
Downloads:0

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