Fig. 1.

Phenotype of the fewer roots (fwr) mutant plants. (A) Ten-day-old wild-type (Col) and fwr mutant seedlings. Scale bar = 10 mm. (B–D) Primary root (PR) length (B), emerged lateral root (LR) number (C), total number of emerged LRs and LR primordia of 10-day-old wild-type (Col) and fwr mutant seedlings (D). The error bars represent the SEM (n = 25). Asterisks indicate a statistical difference (*P < 0.01, Student’s t-test). (E) Percentage of LR primordia at given developmental stages in 8-day-old wild-type (Col) and fwr mutant seedlings. Stage classification of LR primordia is based on Malamy and Benfey (1997). Total numbers of LR primordia are 105 in 14 Col seedlings and 28 in 31 fwr mutant seedlings, respectively.