Figure 2. The AGPase activity in leaves (a), stems (b) and roots (c); and the starch synthase activity (d) and amylase activity (e) in roots of cassava cultivars H14 and F01.

Plants of the same size were chosen. Leaf tissue samples (not including petioles) from the sixth leaf down from the top of each plant were used. The roots were fibrous roots at the first two growth stages of ‘seedling’ and formation of root system, and the storage roots at the other two growth stages of root bulking and starch maturity. For analysis, root tissues were taken from whole fibrous roots or from the middle sections of the storage roots. Each datum was the mean ± SD from the data of three individual plants. Different letters on the columns indicate the statistic difference at a level of p < 0.05. F01, cassava cultivar Fuxuan 01. H124, cassava cultivar Huanan 124.