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Ecology Letters - 2023 - Franklin - Optimal balancing of xylem efficiency and safety explains plant vulnerability to.pdf

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/101884 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/101884 http://eprints.org/relation/issmallThumbnailVersionOf https://pure.iiasa.ac.at/id/document/101884 archive 353 disk0/00/01/88/55 2023-06-19 07:31:34 2024-04-15 14:09:07 2023-06-19 07:31:34 article show 1 Franklin O. 1791 0000-0002-0376-4140 Fransson P. Hofhansl F. 2222 0000-0003-0073-0946 Jansen S. Joshi J. 8895 pub ASA EM BNR AFE BEC conductivity; embolism; functional traits; optimality; tracheids; trees; vessels; vulnerability; xylem In vast areas of the world, forests and vegetation are water limited and plant survival depends on the ability to avoid catastrophic hydraulic failure. Therefore, it is remarkable that plants take hydraulic risks by operating at water potentials (ψ) that induce partial failure of the water conduits (xylem). Here we present an eco-evolutionary optimality principle for xylem conduit design that explains this phenomenon based on the hypothesis that conductive efficiency and safety are optimally co-adapted to the environment. The model explains the relationship between the tolerance to negative water potential (ψ50) and the environmentally dependent minimum ψ (ψmin) across a large number of species, and along the xylem pathway within individuals of two species studied. The wider hydraulic safety margin in gymnosperms compared to angiosperms can be explained as an adaptation to a higher susceptibility to accumulation of embolism. The model provides a novel optimality-based perspective on the relationship between xylem safety and efficiency. 2023-06-17 published Wiley-Blackwell doi:10.1111/ele.14270 95 3022 3189 public Ecology Letters 26 1485-1496 TRUE 1461-0248 Resilience of Ecosystem Services provided by Intact and Sustainably managed Terrestrial ecosystems (RESIST) info:eu-repo/semantics/article