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Fig. 3. Principal component analysis (PCA) of fatty acid methyl esters (FAMEs) obtained from the rhizosphere soil of canola cultivars grown at Eyebrow and Melfort, Saskatchewan, in 1998. Each symbol is the average of four replicates at one field site (n = 4). Closed symbols represent conventional varieties: triangles, Excel replicates; squares, Fairview replicates; diamonds, Hyola replicates; circles, 45A71 replicates. Open symbols represent genetically modified varieties: triangles, Exceed replicates; squares, Innovator replicates; diamonds, Invigor replicates; circles, Quest replicates. Error bars represent the standard error of the mean. Percent variation and P values are marked in parentheses. Reproduced with permission from Dunfield and Germida (2001).
