Evidence for a function of ATPC2 in development. ATPC2∷GUS staining in 10 d old seedlings in root system (A), hypocotyl-root junction (B), primary root (C), young leaves (D), and cotyledons (E). Representative photographs of root hairs of wild type (WT), two separate atpc2 lines, and gamera (F). Scale bars 1.00 mm. Root hair lengths measured in wild type, two atpc2 lines, and gamera (G) (n = 32–274).