Evidence for adaptive evolution of low-temperature stress response genes in a Pooideae grass ancestor.

The New Phytologist
Magnus D VigelandSimen R Sandve

Abstract

Adaptation to temperate environments is common in the grass subfamily Pooideae, suggesting an ancestral origin of cold climate adaptation. Here, we investigated substitution rates of genes involved in low-temperature-induced (LTI) stress responses to test the hypothesis that adaptive molecular evolution of LTI pathway genes was important for Pooideae evolution. Substitution rates and signatures of positive selection were analyzed using 4330 gene trees including three warm climate-adapted species (maize (Zea mays), sorghum (Sorghum bicolor), and rice (Oryza sativa)) and five temperate Pooideae species (Brachypodium distachyon, wheat (Triticum aestivum), barley (Hordeum vulgare), Lolium perenne and Festuca pratensis). Nonsynonymous substitution rate differences between Pooideae and warm habitat-adapted species were elevated in LTI trees compared with all trees. Furthermore, signatures of positive selection were significantly stronger in LTI trees after the rice and Pooideae split but before the Brachypodium divergence (P < 0.05). Genome-wide heterogeneity in substitution rates was also observed, reflecting divergent genome evolution processes within these grasses. Our results provide evidence for a link between adaptation to cold...Continue Reading

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Citations

Jul 19, 2014·Science·Thomas MarcussenOdd-Arne Olsen
Sep 24, 2015·Annual Review of Genetics·Elizabeth A Kellogg
Dec 4, 2014·PloS One·Karen B StrierAnthony R Ives
Jan 11, 2018·Ecology Letters·Teera WatcharamongkolColin P Osborne
Dec 13, 2017·Biological Reviews of the Cambridge Philosophical Society·H P LinderDavid M Richardson

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Datasets Mentioned

BETA
SRX248128
SRX248126

Methods Mentioned

BETA
RNAseq
environmental stress

Software Mentioned

OrfPredictor
BLASTX
R package phangorn
GOstats R package
paml
R R Development Core Team
BLASTP
house
Bioconductor
seqinr

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