Figure 2.

Scatterplots depicting pairwise correlations between cell-wall-bound p-hydroxybenzoate and total lignin content (A), syringyl content (B), cellulose content (C), xylan content (D), stem volume (E), and wood density (F) in a collection of 316 9-year-old unrelated genotypes of Populus trichocarpa grown in a common garden. The r values provided above each plot are Pearson’s correlation coefficients. The blue lines depict reduced major axis regressions. Syringyl content, cellulose content, xylan content, stem volume, and wood density were normally distributed, whereas the datasets for cell-wall-bound pHB and total lignin content were transformed to meet the conditions of normality.