A and B, Root growth phenotypes. Seven-day-old wild-type (A) and NB208 mutant (B) seedlings grown in rice nutrient solution at 25°C. C and D, Seven-day-old wild type (C) and NB208 mutant (D) seedlings grown in rice nutrient solution at 32°C. E, NB208 mutant seedling grown for 35 d in rice nutrient solution at 25°C; F, NB208 mutant seedlings grown for 25 d in rice nutrient solution at 25°C and then at 32°C for an additional 10 d. G and H, Lateral roots and root hairs on primary roots of wild-type (G) and NB208 mutant (H) seedlings grown for 5 d in rice nutrient solution at 25°C. Bars = 2 cm (A–F) and 200 μm (G and H).