DOI: 10.5061/dryad.5p2b1
title: Data from: The genetics of intra- and interspecific competitive response and effect in a local population of an annual plant species

description: While competition is recognized as a major factor responsible for plant
 community dynamics, the genetics of intra- and interspecific competitive
 ability of a target species (i.e. level of intra-population genetic
 variation, identity of phenotypic traits under selection and genetic
 bases) still deserves a deeper investigation at the local spatial scale by
 considering both numerous genotypes and several interacting species In
 this study, we tested whether the genetics of competitive response and
 effect in Arabidopsis thaliana was dependent on the competitive
 environment at both the intraspecific and interspecific levels. We used a
 mapping population of 48 accessions (i) that maximize the genetic
 diversity of a local population of A. thaliana and (ii) that have been
 genotyped for 168 503 Single Nucleotide Polymorphisms In a common garden
 experiment, those 48 accessions were grown in six competitive
 environments: absence of competition, intraspecific competition and
 interspecific competition with four species frequently associated with A.
 thaliana in natural plant communities (i.e. Poa annua, Stellaria media,
 Trifolium repens and Veronica arvensis). A suite of nine phenotypic
 traits, including a proxy of fitness, were scored on each target A.
 thaliana plant and the above-ground dry biomass of its corresponding
 competitor was estimated We first showed that crossing reaction norms of
 competitive response (A. thaliana performance) and effect (competitor
 biomass) might promote maintenance of genetic variation in a local
 population of A. thaliana and species co-existence at a fine spatial
 scale. By estimating genotypic gradients of selection, we then
 demonstrated that the optimal phenotypic strategies in response to
 competition depend on the identity of the competitor species. Finally, a
 Genome-Wide Association mapping approach highlighted that genomic regions
 associated with direct genetic effects were (i) dependent on the
 competitor species and (ii) different from genomic regions associated with
 interspecific indirect genetic effects While a first step, this study
 highlighted the power of adding ecology to genomics in A. thaliana to
 identify genetic bases underlying micro-geographic adaptation to
 competition. Next-generation sequencing technologies will undoubtedly
 facilitate the discovery of molecular and genetic mechanisms underlying
 competitive ability in other plant species, and thereby the prediction of
 evolutionary trajectories of plant communities
description: Genotypic values of the
 48 accessions in response to six competition treatments.'Treatment':
 A,C, P, S, T and V stand for intraspecific competition, absence of
 competition and interspecific competition with four species frequently
 associated with A. thaliana in natural plant communities (i.e. Poa annua,
 Stellaria media, Trifolium repens and Veronica arvensis).
 'Accession': name of the 48 TOU-A1 accessions used in this
 study. 'ecotype_id' stands for the identity of the 48 accessions
 for running GWA mapping (see Horton et al. Nature Genetics 2012). FITTOT,
 BT, INT, RP, FT_diam, H1S, HD, RAMBB, RAMPB_S and COMP have been described
 in the main text.data_dryad_n2.txt