Gibberellins (GA) - Leaf yellowing has been delayed on intact and excised foliage of
several crops. GA4+7 sprays have been shown to delay yellowing of Easter lily (Lilium
longiflorum Thumb.) foliage on intact plants (7, S). In addition, GA3 pulses have been shown
to effectively delay chlorosis of cut Alstroemeria hybrida L. (9) Narcissus tazetta L. stems (10)
and Hosta plantaginea (Lam.) Asch. andZantedeschia aethiopica (L.) Spreng. leaves (14). GA3
sprays have been effective in reducing yellowing of excised Easter lily leaves (4, 6). Like BA,
the beneficial effects of gibberellins are reportedly due to their suppression of respiration.