Figure 2.
Examples of simultaneous measurements of 14C activity in leaf 2 of wheat (A and C, expressed as a percentage of activity in leaf 2 at the end of the pulse feed) and in the 30-min fractions of hydroponic solution (B and D, expressed in radiation counter units) after a 30-min pulse feed to leaf 2 on 15- and 16-d-old plants. This compares a control plant (A and B) with one partially defoliated 5 h before the end of the pulse-feed (C and D). The fitted line (y = ae–bt + ce–dt) has the following values for the constants: (A) a = 66.4 ± 1.3, b = 1.24 ± 0.05, c = 33.7 ± 0.8, d = 0.037 ± 0.003 (r2 > 0.99); (C) a = 63.4 ± 0.7, b = 0.75 ± 0.02, c = 36.6 ± 0.7, d = 0.043 ± 0.002 (r2 > 0.99). The traces shown are representative of at least three independently replicated experiments.