Figure 4.

Comparison of spatial distributions of relative elongation rate (A) and relative widening rate (B) and of expressions of three expansin genes (C, D, and E for ZmEXPA4, ZmEXPA9, and ZmEXPB2, respectively) at the leaf base of well-watered plants of the F2 line when the leaf is rapidly elongating (25 d after leaf initiation, mean length = 300 mm; same data as in Fig. 2; black line) or in young leaves either 45-mm-long (▵, 17 d after leaf initiation) or 120-mm-long (light gray triangle, 19 d after leaf initiation). Maximal expression among the samples from the rapidly elongating leaf was set to 1. Error bars are omitted for better legibility.