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Stomatal regulation, leaf water relations, and leaf phenology are coordinated in tree species from the Sonoran Desert.
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To cope with heat and water stress, evergreen and deciduous species from hot and arid deserts should adjust their stomatal conductance ( ) and leaf water potential (Ψ) regulation in response to changes in soil water availability, high temperatures, and vapour pressure deficits (VPDs). To test whether phenology induces changes in -Ψ coordination, we tested for associations between 14 leaf traits involved in leaf economics, hydraulics, and stomatal regulation, including minimum seasonal water potential (Ψ) and maximum ( ), turgor loss point (Ψ), osmotic potential (Ψ), leaf area (LA), and specific leaf area (SLA), across 12 tree species from the Sonoran Desert with contrasting phenology. We found that foliar phenology, leaf hydraulics, and leaf economic traits are coordinated across species and organized along the axis of physiological efficiency and safety in response to temperature and VPD.
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