Figure 1From: Analysis of the leaf methylomes of parents and their hybrids provides new insight into hybrid vigor in Populus deltoidesGrowth traits of the parents and their F1 hybrids. Tree height (A) and DBH (B) were measured during five successive years. Means are given with ± SE. Different lower case letters indicate significant differences (P < 0.05) among the lines in trees of the same age. Identical letter indicate the absence of a significant difference and different letter indicate significant difference.Back to article page