Dependence of functional traits related to growth rates and their CO2 response on multiple habitat climate factors across Arabidopsis thaliana populations

Hiroshi Ozaki, Riichi Oguchi, Kouki Hikosaka

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The values of many plant traits are often different even within a species as a result of local adaptation. Here, we studied how multiple climate variables influence trait values in Arabidopsis thaliana grown under common conditions. We examined 9 climate variables and 29 traits related to vegetative growth rate in 44 global A. thaliana accessions grown at ambient or elevated CO2 concentration ([CO2]) and applied a multiple regression analysis. We found that genetic variations in the traits related to growth rates were associated with various climate variables. At ambient [CO2], plant size was positively correlated with precipitation in the original habitat. This may be a result of larger biomass investment in roots at the initial stage in plants adapting to a lower precipitation. Stomatal conductance and photosynthetic nitrogen use efficiency were negatively correlated with vapor pressure deficit, probably as a result of the trade-off between photosynthetic water- and nitrogen-use efficiency. These results suggest that precipitation and air humidity influence belowground and aboveground traits, respectively. Elevated [CO2] altered climate dependences in some of the studied traits. The CO2 response of relative growth rate was negatively correlated with altitude, indicating that plants inhabiting a higher altitude have less plasticity to changing [CO2]. These results are useful not only for understanding evolutionary process but also to predict the plant species that are favored under future global change.

Original languageEnglish
Pages (from-to)987-999
Number of pages13
JournalJournal of Plant Research
Volume131
Issue number6
DOIs
Publication statusPublished - 2018 Nov 1

Keywords

  • Ecotype
  • Functional traits
  • Global change
  • Growth analysis
  • Habitat filtering
  • Local adaptation

ASJC Scopus subject areas

  • Plant Science

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