Root architecture. (A) Morphology of the embryonic root system of seedling cv Nipponbare, 1 week after germination. (B) Morphology of the rice root system 40 days after germination. (C) Detail of a crown root 40 days after germination. ra, radicle; ecr, embryonic crown root; cr, crown root; llr, large lateral root; slr, small lateral root; scale bars (A) 1 cm, (B) 5 cm, (C) 1 cm.