The iso/anisohydry concept characterizes plants according to their water status regulation. Coexisting definitions and misconceptions have recently led to considerable criticism. We discuss here reasons for the misconceptions, and propose a robust definition of iso/anisohydry using the leaf turgor loss point to integrate the complex interplay of plant hydraulic traits.
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Stomatal regulation and water potential variation in European beech: challenging the iso/anisohydry concept.
Tree Physiol
February 2022
Plant Ecology, University of Goettingen, 37073 Göttingen, Germany.
The iso/anisohydric continuum has been used to classify tree species' drought response strategies. The range over which stomata are regulating leaf water potential (ψl) before turgor loss occurs can be described with metrics such as the dependence of ψl on soil water potential (ψsoil) and the size of 'hydroscape area' (HA), but corresponding field data from adult trees are scarce. We examined the stomatal conductance (gs)-ψl relationship in its temporal (diurnal vs seasonal and interannual) and spatial (within-crown vs between-site) variation in European beech, using extensive ψl and gs measurements in the canopy of four beech stands across a precipitation gradient, and complemented the data set by published ψl and gs measurements in further Central European beech stands (including the extreme 2018 drought) in order to cover the full water potential operation space of the species.
View Article and Find Full Text PDFIso/Anisohydry: Still a Useful Concept.
Trends Plant Sci
March 2019
Freie Universität Berlin, Institute of Biology, 14195 Berlin, Germany; Freie Universität Berlin, Dahlem Centre of Plant Sciences, 14195 Berlin, Germany; Berlin Brandenburg Institute of Advanced Biodiversity Research (BBIB), 14195 Berlin, Germany.
The iso/anisohydry concept characterizes plants according to their water status regulation. Coexisting definitions and misconceptions have recently led to considerable criticism. We discuss here reasons for the misconceptions, and propose a robust definition of iso/anisohydry using the leaf turgor loss point to integrate the complex interplay of plant hydraulic traits.
View Article and Find Full Text PDFWater potential regulation, stomatal behaviour and hydraulic transport under drought: deconstructing the iso/anisohydric concept.
Plant Cell Environ
June 2017
CREAF, Cerdanyola del Vallès, Barcelona, E-08193, Spain.
In this review, we address the relationship between stomatal behaviour, water potential regulation and hydraulic transport in plants, focusing on the implications for the iso/anisohydric classification of plant drought responses at seasonal timescales. We first revise the history of the isohydric concept and its possible definitions. Then, we use published data to answer two main questions: (1) is greater stomatal control in response to decreasing water availability associated with a tighter regulation of leaf water potential (Ψ ) across species? and (2) is there an association between tighter Ψ regulation (~isohydric behaviour) and lower leaf conductance over time during a drought event? These two questions are addressed at two levels: across species growing in different sites and comparing only species coexisting at a given site.
View Article and Find Full Text PDFMapping 'hydroscapes' along the iso- to anisohydric continuum of stomatal regulation of plant water status.
Ecol Lett
November 2016
Department of Forest Ecosystems and Society, Oregon State University, Corvallis, OR, 97331, USA.
The concept of iso- vs. anisohydry has been used to describe the stringency of stomatal regulation of plant water potential (ψ). However, metrics that accurately and consistently quantify species' operating ranges along a continuum of iso- to anisohydry have been elusive.
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