Figure 3. Activity of key enzymes in high (¡) and low (l) commercial cane sugar (CCS) clones from introgression population, IJ76-514 x Q165. Measurements performed in the first series (a–c); measurements performed in the second series (d–f). Panels a and d are sucrose-phosphate synthase; b and e, neutral invertase; and c and f, soluble acid invertase. The units of activity are µg sucrose formed mg ^–1 protein min^–1 in a and d; µg sucrose cleaved mg ^–1 protein min^–1 in b, c, e, and f. Each point is the mean ± SE of six measurements.