Fig. S1 A graphical representation of the GA1 locus of Arabidopsis thaliana and a Bayesian phylogram of full-length GA1 sequences including both exon and intron regions from 32 accessions of A. thaliana rooted by A.  lyrata.

Fig. S2 Cumulative distribution of P-values using the 149 background SNPs to test for associations with the floral first principal component.

Table S1 List of 32 Arabidopsis thaliana accessions, location of origin (including latitude and longitude), and GenBank number for the GA1 sequence utilized in exploring levels polymorphisms and estimating GA1 genealogical trees

Table S2 Primer sequences for four SNPs identified in GA1 and enzymes for associated restriction digests

Table S3 List of 133 Arabidopsis thaliana accessions used in candidate gene association analyses between floral morphology and GA1

Table S4 Mixed-model ANOVA of floral morphological traits measured from 133 Arabidopsis thaliana accessions

Table S5 Principal component analysis of all measured floral traits in (a) an association mapping panel of Arabidopsis thaliana, (b) the Arabidopsis MAGIC segregating progeny, and (c) the Bay-0 × Sha recombinant inbred lines

Table S6 Average likelihood values and standard deviation from 20 runs of STRUCTURE (K = 1–15) examining population structure in 133 Arabidopsis thaliana accessions genotyped at 149 SNPs

Table S7 Linkage disequilibrium among four SNPs genotyped at the GA1 locus in 133 accessions of Arabidopsis thaliana

Table S8 ANOVA of floral morphological traits measured from the Arabidopsis MAGIC segregating progeny

Table S9 Mixed-model ANOVA of floral morphological traits measured from the Arabidopsis thaliana Bay-0 × Sha recombinant inbred lines

Table S10 Association analyses between 77 SNPs (plus the GA1 haplotype described in the Materials and Methods section) within the 40 kb region centered on GA1 and the first floral principal component

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