Figure 2.

Supernodulation phenotype of rdn1-1. Seedlings of the two genotypes were grown together in an aeroponic chamber containing nutrient solution lacking nitrogen (A) or supplemented with10 mm NH₄NO₃ (B) and were assayed after 14 d of growth (10 d post inoculation with S. medicae). Nodules per plant (means ± se) are shown (A, 40 to 45 plants of each genotype from three combined experimental replicates; B, 17 to 20 plants per genotype from two combined experimental replicates). Student’s t tests were used to determine significance of differences from wild type (*P < 0.0001).