Fig. 9. The differential expression of genes involved in lignin biosynthesis in ‘Golden Delicious’ treated with 0.5 mmol L−1 of exogenous CA. (A)–(C) represent the geneexpressions of CAD, POD and PPO, the upper is RT-PCR photos, and the lower is gray analysis of relative expression of genes. The bars in the curve graphs are standard errors.