Changes in gelatinisation of tuber starch granules from transgenic potato lines. (A) Effect of GBSS knockdown (1041–3) or SBEII overexpression (1047–17) on starch granule swelling in 4 M urea. (B) Comparison of swelling of starch granules in a range of urea concentrations. Gelatinisation was assessed by measuring the volume of the swollen starch pellet. Data are mean pellet volumes ± SD (n = 4 biological replicates).