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ABSTRACT
Peroxidase activity was monitored during somatic embryogenesis of white fir (Abies concolor Gord. et Glend) starting from a non-embryogenic callus. Results revealed profound differences between non-embryogenic and embryogenic calli with an elevated level of enzyme activity in non-embryogenic ones. Precotyledonary, early cotyledonary and late cotyledonary stages of somatic embryogenesis were characterized by a substantially reduced peroxidase activity compared to callus tissues and regenerated plantlets. Changes in peroxidase activity are as a rule paralleled by variation in isoenzyme composition. The utility of the enzyme in the induction stage of somatic embryogenesis in white fir is proposed.