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Response of Pisum sativum L. to Gibberellic Acid Seed Treatment¹

Gibberellic acid (GA) was applied to seed of Alaska peas to determine effects on rate of emergence, stem elongation, flowering, and yield. The effect of GA on the rate of emergence was dependent upon the temperature of the environment. Emergence of GA treated seedlings was 4 to 6 days earlier than non-treated seedlings under cool conditions. At high temperatures, GA treated seedlings emerged one day earlier than the control, but emerged plants were susceptible to heat damage. Stem elongation was directly related to GA concentration and appeared to be inversely related to development of the root system. Date of blooming and maturity were not enhanced by GA treatment, but GA increased the number of flowers in the May 1 planting. Dry weight at maturity and seed yield were significantly lowered by seed application of GA.

Key Words: High temperature • Seed yield • Seedling emergence

² Associate Professor of Agronomy, Kansas State University; Professor of Agronomy, Washington State University; Research Agronomist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Pullman, Washington 99163.

Received for publication September 23, 1969.