The llg1-3 plants show normal growth phenotypes. (A) Four-week-old, short-day-grown plants of Col-0, llg1-2, llg1-3, and llg1-2 llg1-3 F1 and a representative LLG1 llg1-2 complementation line. (B) Root hairs from 5-d-old Col-0, llg1-2, llg1-3, fer-4, fer-4 llg1-2, and fer-4 llg1-3 seedlings. (Scale bars, 100 μm.) The experiment was repeated three times with similar results. (C) Root hair length from 5-d-old seedlings. Error bars represent SD of three independent experiments (n = 50). Lowercase letters represent significant differences (P < 0.05, nested ANOVA). (D) Root hair growth after auxin treatment. Five-day-old Arabidopsis seedlings treated with 0 or 200 nM NAA are shown. (Scale bars, 0.2 cm.) The experiment was repeated three times with similar results. (E) Root hair length from 5-d-old seedlings treated with 0 or 200 nM NAA. Error bars represent SD of three independent experiments (n = 50). Asterisks represent significant differences (P < 0.01) using Student’s t test.