Mapping ‘hydroscapes’ along the iso‐ to anisohydric continuum of stomatal regulation of plant water status |
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| Authors: | Frederick C. Meinzer David R. Woodruff Danielle E. Marias Duncan D. Smith Katherine A. McCulloh Ava R. Howard Alicia L. Magedman |
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| Affiliation: | 1. USDA Forest Service, Pacific Northwest Research Station, Corvallis, OR, USA;2. Department of Forest Ecosystems and Society, Oregon State University, Corvallis, OR, USA;3. Department of Botany, University of Wisconsin‐Madison, Madison, WI, USA;4. Department of Biology, Western Oregon University, Monmouth, OR, USA |
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| Abstract: | 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. Additionally, most approaches to quantifying iso/anisohydry require labour‐intensive measurements during prolonged drought. We evaluated new and previously developed metrics of stringency of stomatal regulation of ψ during soil drying in eight woody species and determined whether easily‐determined leaf pressure–volume traits could serve as proxies for their degree of iso‐ vs. anisohydry. Two metrics of stringency of stomatal control of ψ, (1) a ‘hydroscape’ incorporating the landscape of ψ over which stomata control ψ, and (2) the slope of the daily range of ψ as pre‐dawn ψ declined, were strongly correlated with each other and with the leaf osmotic potential at full and zero turgor derived from pressure–volume curves. |
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| Keywords: | Anisohydry drought resistance isohydry leaf osmotic potential leaf turgor plant traits plant water potential stomata |
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