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Coordination between leaf, stem, and root hydraulics and gas exchange in three arid‐zone angiosperms during severe drought and recovery

Citation

Creek, D and Blackman, CJ and Brodribb, TJ and Choat, B and Tissue, DT, Coordination between leaf, stem, and root hydraulics and gas exchange in three arid‐zone angiosperms during severe drought and recovery, Plant, Cell and Environment, 41, (12) pp. 2869-2881. ISSN 0140-7791 (2018) [Refereed Article]

Copyright Statement

Copyright 2018 John Wiley & Sons Ltd.

DOI: doi:10.1111/pce.13418

Abstract

The ability to resist hydraulic dysfunction in leaves, stems, and roots strongly influences whether plants survive and recover from drought. However, the coordination of hydraulic function among different organs within species and their links to gas exchange during drought and recovery remains understudied. Here, we examine the interaction between gas exchange and hydraulic function in the leaves, stems, and roots of three semiarid evergreen species exposed to a cycle of severe water stress (associated with substantial cavitation) and recovery. In all species, stomatal closure occurred at water potentials well before 50% loss of stem hydraulic conductance, while in two species, leaves and/or roots were more vulnerable than stems. Following soil rewetting, leaf‐level photosynthesis (Anet) returned to prestress levels within 2–4 weeks, whereas stomatal conductance and canopy transpiration were slower to recover. The recovery of Anet was decoupled from the recovery of leaf, stem, and root hydraulics, which remained impaired throughout the recovery period. Our results suggest that in addition to high embolism resistance, early stomatal closure and hydraulic vulnerability segmentation confers drought tolerance in these arid zone species. The lack of substantial embolism refilling within all major organs suggests that vulnerability of the vascular system to drought‐induced dysfunction is a defining trait for predicting postdrought recovery.

Item Details

Item Type:Refereed Article
Keywords:cavitation, drought, gas exchange, hydraulics, recovery, stomatal closure, vulnerabilitysegmentation, water relation
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Physiology
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate Change Adaptation Measures
UTAS Author:Brodribb, TJ (Professor Tim Brodribb)
ID Code:128905
Year Published:2018
Funding Support:Australian Research Council (DP170100761)
Web of Science® Times Cited:16
Deposited By:Plant Science
Deposited On:2018-10-23
Last Modified:2019-03-27
Downloads:0

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