Adaptation and coordinated evolution of plant hydraulic traits

Pablo Sanchez-Martinez*, Jordi Martínez-Vilalta, Kyle G. Dexter, Ricardo A. Segovia, Maurizio Mencuccini

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

22 Citations (Scopus)

Abstract

Hydraulic properties control plant responses to climate and are likely to be under strong selective pressure, but their macro-evolutionary history remains poorly characterised. To fill this gap, we compiled a global dataset of hydraulic traits describing xylem conductivity (Ks), xylem resistance to embolism (P50), sapwood allocation relative to leaf area (Hv) and drought exposure (ψmin), and matched it with global seed plant phylogenies. Individually, these traits present medium to high levels of phylogenetic signal, partly related to environmental selective pressures shaping lineage evolution. Most of these traits evolved independently of each other, being co-selected by the same environmental pressures. However, the evolutionary correlations between P50 and ψmin and between Ks and Hv show signs of deeper evolutionary integration because of functional, developmental or genetic constraints, conforming to evolutionary modules. We do not detect evolutionary integration between conductivity and resistance to embolism, rejecting a hardwired trade-off for this pair of traits.

Original languageEnglish
Pages (from-to)1599-1610
Number of pages12
JournalEcology Letters
Volume23
Issue number11
DOIs
Publication statusPublished - 1 Nov 2020

Keywords

  • Adaptation
  • evolution
  • evolutionary correlation
  • global
  • phylogenetic comparative methods
  • phylogenetic conservatism
  • phylogenetic mixed models
  • plant hydraulics

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