The promotion of isocitrate lyase activity in hazel cotyledons by exogenous gibberellin.

Treatment of intact dormant hazel seeds with gibberellin for 96 hours, after an initial 24 hour immersion in sterile distilled water, resulted in a substantially greater increase in the specific activity of isocitrate lyase than that observed in the corresponding water controls. The fresh weights of embryonic axes increased over the same period, but were not appreciably greater after exposure to gibberellin than after sterile distilled water treatment.