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Hydroscapes, hydroscape plasticity, and relationships to plant functional traits and mesophyll photosynthetic sensitivity in Eucalyptus species
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  • Amanda Salvi,
  • Sophia Gosetti,
  • Duncan Smith,
  • Mark Adams,
  • Thomas J. Givnish,
  • Katherine McCulloh
Amanda Salvi
University of Wisconsin-Madison Department of Botany

Corresponding Author:asalvi@wisc.edu

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Sophia Gosetti
University of Wisconsin-Madison Department of Botany
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Duncan Smith
University of Wisconsin-Madison Department of Botany
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Mark Adams
Swinburne University of Technology
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Thomas J. Givnish
University of Wisconsin-Madison Department of Botany
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Katherine McCulloh
University of Wisconsin-Madison Department of Botany
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Abstract

The isohydric-anisohydric continuum describes the relative stringency of stomatal control of leaf water potential ( ψleaf) during drought. Hydroscape area ( HA) – the water potential landscape over which stomata regulate ψleaf – has emerged as a useful metric of the iso/anisohydric continuum because it is strongly linked to several hydraulic, photosynthetic, and structural traits. Previous research on HA focused on broad ecological patterns involving several plant clades. Here we investigate relationships of HA to climatic conditions and functional traits across ecologically diverse but closely related species while accounting for phylogeny. Across a macroclimatic moisture gradient, defined by the ratio of mean annual precipitation to mean annual pan evaporation ( P/Ep), HA decreased with P/Ep for ten Eucalyptus species. Greater anisohydry reflects lower turgor loss points and greater hydraulic safety, mirroring global patterns. More isohydric species have mesophyll photosynthetic capacity that is more sensitive to ψleaf, consistent with an earlier model for optimal stomatal behavior. Hydroscapes exhibit little plasticity in response to variation in water supply, and the extent of plasticity does not vary with P/Ep of native habitats. These findings strengthen the case that HA is a useful metric for characterizing drought tolerance and water-status regulation.
08 Mar 2022Submitted to Plant, Cell & Environment
08 Mar 2022Submission Checks Completed
08 Mar 2022Assigned to Editor
08 Mar 2022Reviewer(s) Assigned
05 Apr 2022Review(s) Completed, Editorial Evaluation Pending
06 Apr 2022Editorial Decision: Revise Minor
04 May 20221st Revision Received
04 May 2022Submission Checks Completed
04 May 2022Assigned to Editor
10 May 2022Review(s) Completed, Editorial Evaluation Pending
10 May 2022Editorial Decision: Revise Minor
28 May 20222nd Revision Received
01 Jun 2022Submission Checks Completed
01 Jun 2022Assigned to Editor
06 Jun 2022Review(s) Completed, Editorial Evaluation Pending
06 Jun 2022Editorial Decision: Revise Minor
07 Jun 20223rd Revision Received
07 Jun 2022Submission Checks Completed
07 Jun 2022Assigned to Editor
14 Jun 2022Review(s) Completed, Editorial Evaluation Pending
14 Jun 2022Editorial Decision: Accept