Fig. 1

Morphology of red maple leaves and pigment accumulation in different colored leaves. a Different leaf colors of red maple. b Anthocyanin composition obtained by HPLC from green, red, and yellow leaves of red maple. c Chlorophyll-a, chlorophyll-b and carotenoid content of green, red, and yellow leaves of red maple. Error bars show standard error (SE) of the mean. GL, green leaves; RL, red leaves; YL, yellow leaves. Different lowercase letters above the error bars indicate significant difference of correlation at 0.05 level (One way ANOVA, p-value < 0.05); Different capital letters above the error bars indicate significant difference of correlation at 0.01 level (One way ANOVA, p-value < 0.01)