Physiological Effects of Gibberellic Acid. VI. Other Gibberellins in Three Test Systems

Abstract
The activities of gibberellins 1, 3, 4, 5, 6, 8 and 9 and allogibberic acid in promoting sugar and N release from barley endosperm, hypocotyl and radicle extension in lettuce seedlings, and berry enlargement in Currant grapes were tested. The relative activities of the gibberellins in these various tests were similar to those reported by other workers, except that allogibberic acid exhibited biological effectiveness in promoting sugar and N release and radicle elongation. It is concluded that a re-evaluation of the biological necessity for the lactone structure in gibberellin-like compounds is required.