Changes in the contents of sugars and starch in seed (a) and podwall (b) and the activities of acid invertase, alkaline invertase and alpha-galactosidase in seeds (c) and podwall (d) during pod development. Suc, sucrose; Glc, glucose; Fru, fructose; Raf, raffinose; Stc, stachyose; ACI, acid invertase; AKI, alkaline invertase, AG, alpha-galactosidase, DAF, days after flowering. Values are the mean ± S. D. of three replicates. Values marked with different letter (s) indicate significant differences at different DAF as according to Tukey’s test (p < 0.05)