Table I.

Lateral root initiation in response to varying Suc to nitrogen ratios

% Suc[N]1-aLateral Roots1-bLength1-cLateral Roots
mm cm
4.50.021.0 ± 0.63.04 ± 0.390.33
4.560.01-d 16.6 ± 4.24.46 ± 0.563.72
0.50.0219.7 ± 5.13.82 ± 0.405.16
  • F1-a  The sole nitrogen source in the media is NH4NO3. NH4NO3 (0.01 mm) is referred to as 0.02 mmN.

  • F1-b  Lateral roots, including both microscopic lateral root primordia and emerged lateral roots, were counted on 13-d-old seedlings. Means ± sd are given for 10 to 14 roots.

  • F1-c  Root length was measured from hypocotyl/root junction. Means ± sd are given for 25 to 30 roots.

  • F1-d  Standard Murashige and Skoog media (Gibco-BRL, Grand Island, NY), which contains 20 mm NH4NO3 and 20 mmKN03 for a total of 60 mm N.