Correlation of plastic traits with environmental variables.

<p><i>r</i> values (Pearson) representing correlations between the shade avoidance response in A) Sum Length and (Sum Area)^1/2 of accessions with latitude, longitude, altitude, mean annual temperature, mean annual precipitation, and NDVI. Note that the plastic responses of Sum Length and (Sum Area)^1/2 to simulated shade correlate with NDVI inversely, whereas both positively correlate with NDVI when only the simulated sun or shade treatment is considered (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0029570#pone-0029570-g002" target="_blank"><b>Fig. 2</b></a>). Scatter plots showing that the shade avoidance response for Sum Length (B) is negatively correlated with NDVI, whereas shade avoidance in (Sum Area)^1/2 (C) is positively correlated with NDVI. Significance of <i>r</i> values deviating from 0 is denoted by solid (p<0.05) and gray (p>0.05) fill. <i>S. arcanum</i>, and <i>S. habrochaites</i>, and <i>S. pimpinellifolium</i> accessions are represented by gold, magenta, and navy, respectively.