Fig. 3

Variation in total and selected flavonoid accumulation in leaves of Cyclocarya paliurus per plant among various treatments (mean ± SD, samples collected in October 20, 2011). Different lower case letters indicate significant differences among various treatments within the same flavonoid (p < 0.05 by Tukey’s test). A1, A2 and A3 represent no shading, shading with one-layer net, and shading with two-layer nets, respectively, whereas B1, B2 and B3 indicate different provenances Wufeng, Yuanling and Muchuan, respectively