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NO is necessary for normal primary root elongation. A, Growth rate (from 0–13 d after sowing) of primary root of Col-0, noa1, nia1 nia2, and nia1 nia2 noa1 seedlings grown vertically under standard conditions. Error bars represent se; n > 40. B, Growth rate (from 0–13 d after sowing) of primary root of Col-0 seedlings grown vertically in the presence of 0, 10, 20, and 50 µm L-NMMA (+dimethyl sulfoxide). Error bars represent se; n > 40.
