Figure 5.

Susceptibility of Arabidopsis petioles to a crude expansin extract. Petioles from Col-0 plants grown under low R/FR (A) and green shade (B) for 8 and 24 h were tested for their susceptibility to equal amounts of a crude cell wall expansin extract (CCWE) in an extensometer relative to white light control petioles. Data points represent means ± se (n = 5). Similar letters above the bars indicate nonsignificant differences (P < 0.05, Tukey’s b test).