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Effect of nitrate availability in the growth medium on root system architecture of wild-type (wt) and arm plants. Seedlings were grown vertically on Murashige and Skoog medium with increasing nitrate (KNO3) supply for 13 d. A, PR length. B, LR (>1 mm) number; n = 8 ± se. Black symbols, wild type; white symbols, arm mutant. C, Picture of root tip. Bar = 0.5 mm.
