FIG. 2. Response of different maize roots to application of a DC electric field of 1 V cm21 over 3 h. The root on the left was photographed 3 h after
beginning the field application (A) and that on the right 24 h after disconnecting the field (B). The root in B has just started growing downward
again. The extent of root growth deviation from the vertical course, caused by the field, is indicated by the angle drawn on the photograph on the left.
which is normally observed only in the derivatives of the
initials. Again, all these changes were absent in roots
from a control experiment.