Figure 1. Phylogenetic tree of cloned and sequenced PCR products (individual clones labeled a-e) spanning two introns of the EPSPS gene in three glyphosate-resistant (R) and three susceptible (S) A. palmeri individuals supports the existence of two EPSPS loci in A. palmeri, and the amplification of one EPSPS locus in R genomes.

Scale bar represents the number of nucleotide substitutions per site.