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\begin{document}

\title{Hydroscapes, hydroscape plasticity, and relationships to plant
functional traits and mesophyll photosynthetic sensitivity in Eucalyptus
species}



\author[1]{Amanda Salvi}%
\author[1]{Sophia Gosetti}%
\author[1]{Duncan Smith}%
\author[2]{Mark Adams}%
\author[1]{Thomas J. Givnish}%
\author[1]{Katherine McCulloh}%
\affil[1]{University of Wisconsin-Madison Department of Botany}%
\affil[2]{Swinburne University of Technology}%


\vspace{-1em}



  
  \date{May 17, 2024}


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\selectlanguage{english}
\begin{abstract}
The isohydric-anisohydric continuum describes the relative stringency of
stomatal control of leaf water potential ( \selectlanguage{greek}\emph{ψ\textsubscript{leaf}}\selectlanguage{english})
during drought. Hydroscape area ( \emph{HA}) -- the water potential
landscape over which stomata regulate \selectlanguage{greek}\emph{ψ\textsubscript{leaf}}\selectlanguage{english} --
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 \emph{HA} focused on broad
ecological patterns involving several plant clades. Here we investigate
relationships of \emph{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 (
\emph{P/E\textsubscript{p}}), \emph{HA} decreased with
\emph{P/E\textsubscript{p}} for ten \emph{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
\selectlanguage{greek}\emph{ψ\textsubscript{leaf}}\selectlanguage{english}, 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 \emph{P/E\textsubscript{p}} of native habitats. These
findings strengthen the case that \emph{HA} is a useful metric for
characterizing drought tolerance and water-status regulation.%
\end{abstract}%



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\textbf{Hosted file}

\verb`Salvi et al_Main Document_PCE_with markup.docx`  available at \url{https://authorea.com/users/464228/articles/559186-hydroscapes-hydroscape-plasticity-and-relationships-to-plant-functional-traits-and-mesophyll-photosynthetic-sensitivity-in-eucalyptus-species}

\textbf{Hosted file}

\verb`Salvi et al_Figures_PCE.docx`  available at \url{https://authorea.com/users/464228/articles/559186-hydroscapes-hydroscape-plasticity-and-relationships-to-plant-functional-traits-and-mesophyll-photosynthetic-sensitivity-in-eucalyptus-species}

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