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Root growth in rdn1 mutants compared to wild type (A17) and the sunn-4 supernodulation mutant. Root lengths of seedlings were measured after 14 d of growth in an aeroponic chamber containing nutrient solution supplemented with 5 mm NH4NO3 as a nitrogen source. Means ± se are shown. n = 8 plants per genotype. Student’s t tests were used to determine the significance of differences from wild type (*P < 0.001).
