Cytochalasin-B-induced inhibition of root-hair growth in lettuce seedlings and its reversal by benzyladenine.

Cytochalasin-B (CB) inhibited root-hair growth in lettuce seedlings. This inhibition was partially overcome by benzyl-adenine (BA) and kinetin, but not by gibberellic acid, indole-3-acetic acid, abscisic acid, cyclic AMP or ethylene. BA, however, was unable to prevent the inhibition of cytoplasmic streaming induced by CB, a result indicating that cytoplasmic streaming is not necessary for root-hair growth.