Figure 1.

Auxin influx transport inhibitor 1-NOA negatively affects nodulation in D. trinervis. Percentage of plants showing nodules after inoculation with Frankia in the presence of 1-NOA from before inoculation (black line/solid box), from the moment of inoculation (dark gray line/solid squares) or without inhibitor (gray line/empty squares). Nodulation was not observed in non-inoculated control plants (empty diamonds). Letters indicate statistically different groups based on the Tukey-Kramer multiple comparison procedure (P < 0.01).