Table IV.

Effect of NAA on lateral root initiation in wild-type and lin1 roots

NAA4-aCollin1
LR no.4-bLength4-cLRLR no.4-bLength4-cLR
nm   cm   cm
013.4 ± 3.14.4 ± 0.393.018.7 ± 3.55.0 ± 0.213.7
1014.5 ± 3.23.7 ± 0.453.920.1 ± 2.84.4 ± 0.484.6
5036.7 ± 4.73.8 ± 0.309.738.7 ± 11.83.9 ± 0.549.9
10049.6 ± 6.22.8 ± 0.3217.760.4 ± 8.73.2 ± 0.3318.9
  • F4-a  Seedlings were grown for 5 d on standard Murashige and Skoog media (4.5/60). They were then transferred to the same media containing various concentrations of NAA as indicated, and the position of the root tip was marked. Seven days later, the region of new growth was excised, cleared, and analyzed.

  • F4-b  All lateral roots and microscopic root primordia were counted. Lateral root nos. after NAA treatment were sometimes difficult to assess accurately because many of the primordia become confluent. Means ± sd are given for 10 roots.

  • F4-c  Length of the newly grown region of the root was measured from the mark to the root tip. Means ±sd are given for 12 to 20 roots.