Genetic variation in tolerance of competition and neighbour suppression in Arabidopsis thaliana

C. G. Willis, M. T. Brock, C. Weinig

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Intraspecific competitive interactions can profoundly influence phenotypic evolution. However, prior studies have rarely evaluated the evolutionary potential of the two components of competitive ability, tolerance of competition and suppression of neighbours. Here, we grow a set of 20 Arabidopsis thaliana recombinant inbred lines in three competitive treatments (noncompetitive, intra-genotypic competition and inter-genotypic competition) to examine if there is genetic variation for the components of competitive ability and whether neighbour relatedness has an effect on fitness. We find evidence for genetic variation in tolerance of competition and neighbour suppression and that these two competitive strategies are correlated, such that genotypes that tolerate competition will also strongly suppress neighbours. We further observe that the effect of neighbour relatedness on fitness of target individuals depends on neighbour identity, i.e. whether target individuals perform better when competing against self vs. nonself individuals depends on the genotypic identity of the nonself neighbour. The results are particularly relevant to evolutionary responses under multi-level selection.

Original languageEnglish (US)
Pages (from-to)1412-1424
Number of pages13
JournalJournal of evolutionary biology
Volume23
Issue number7
DOIs
StatePublished - Jul 1 2010

Keywords

  • Arabidopsis thaliana
  • Competitive effect
  • Competitive response
  • Multi-level selection
  • Sibling competition

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