Carboxypeptidases of germinating triticale grains

Presence of five carboxypeptidases was found in endosperm of germinating triticale grains, while two of them in scutellum. Changes of their activities during four days of germination suggest that carboxypeptidase II plays an important role at initial stage of germination, while carboxypeptidases I and III - at subsequent stages of the process. High activity of carboxyt peptidase II both in scutellum and endosperm of dry grains accompanied by its decrease during germination, and on the other hand, the appearance of carboxypeptidases I and III activities at the 2nd and 3rd day of the process seems to confirm such functions of these enzymes. Experiments with GA3 indicated that carboxypeptidase I was synthesized in scutellum, and carboxypeptidase III - in aleurone layer. Carboxypeptidases I and II cleave N-CBZ-Phe-Ala, and carboxypeptidase III - N-CBZ-Ala-Met and N-CBZ-Ala-Phe as substrates with the highest rate.