Time course of lateral root initiation
The ®rst responsive tips (i.e. tips containing at least one
lateral meristem) appeared after 2 d (Fig. 3). The number of
responsive tips increased rapidly, representing 88% of the
root tips after 4 d, after which time they remained
unchanged. In contrast, only the apical meristem was
detectable in this area in control excised roots as well as in
intact roots of plantlets grown without auxin. After 4 d, an
average of 1±3 meristems were induced in root tips (Fig. 3).