Gibberellin-sensitive Suspension Cultures

Abstract
Suspension cultures were incubated in the presence and absence of gibberellic acid (GA3) in an attempt to define a new experimental system for study of the molecular action of gibberellins upon growth. Unlike many suspension cultures, an auxin-independent green clone from spinach (Spinacia oleracea L.) and an auxin-dependent line of “Paul's Scarlet” rose (Rosa sp.) were promoted in expansion growth by GA3 at 10−11 to 10−6 molar. In Rosa the cells also elongated upon GA3 treatment whereas in Spinacia they remained isodiametric.