Water potential regulation, stomatal behaviour and hydraulic transport under drought: deconstructing the iso/anisohydric concept

Abstract 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 L ) across species? and (2) is there an association between tighter Ψ L regulation (~isohydric behaviour) and lower leaf conductance over time during a drought event? These…

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  Institució Catalana de Recerca i Estudis Avançats