Abstract
Repeated spraying of gebberellin solution promoted the initiation of spikelet primordia in cold requiring wheats under the condition of high temperature which was unfavorable for the progress of vernalization. It proves that gibberellin can replace the vernalization by low temperature. In such cases, the primordium differentiation in shoot apex was stimulated by the chemical before the initiation of spikes. There were, moreover, some indications that the spikelet production in a young ear might be enhanced. No discernible elongation of internodes was seen before spikelet initiation in all gibberellin-treated plants.
