PCA results for chemotypes and compound relationship of 19 salicinoids found in the foliage of <i>Populus tremula</i> from the SwAsp collection. a.

<p>Score scatter plot of the first two principle components for 319 individuals from 102 genotypes. Solid symbols = greenhouse grown trees, open symbols = field grown trees; circles = CN (2′-cinnamoyl), diamonds = AC (2′-acetyl), squares = CN-AC (2′-cinnamoyl/2′-acetyl), and triangles = TL (<i>tremuloides</i>-like) chemotypes. Percentages of clones of the different salicinoid chemotypes in parentheses. <b>b.</b> Loading scatter plot of the first two principle components for 19 salicinoids.