307415.fig.001
Figure 1: Average IAA concentration at 24, 48, and 72 h by cultivable soil bacteria from soil without macroorganisms (S), with the plant Arabidopsis thaliana (P), with the earthworm Aporrectodea caliginosa (E) and with both plant and earthworms (PE). Means ± s.e., n = 17, different letters indicate a significant difference, Tukey HSD, P < 0.05.