FIGURE 4.

Comparison of rotundone production in non-grape materials and berries at a specific vineyard location in the 2013–2014 growing season. (A) Concentration of rotundone among different non-grape materials and berries at veraison and harvest, where a, b, c, d and A, B, were used to label significant differences (p < 0.05) among grapevine materials, while α, β, γ were used to label significant differences (p < 0.05) between veraison and harvest. Standard deviation of each measurement was labeled on each bar. (B) Comparison of total rotundone content in individual vine shoot between veraison and harvest, where a, b were used to label the significant differences (p < 0.05) between veraison and harvest, A, B were used to label the significant differences (p < 0.05) between total rotundone content in leaves, petiole, and peduncles/rachises and that of berries. Standard deviations of total rotundone content at veraison and harvest were labeled on each bar.