Influence of Aminotriazol on the Biosynthesis of Chlorophyll and Phytol

Abstract Treatment of wheat caryops with 3-amino-1,2,4-triazol followed by dark germination leads to phytol deficiency (based on the chlorophyll content) during the subsequent greening process in the light. The analysis of the pigment fraction reveales the presence of chlorophyll esterified with geranylgeraniol and dihydrogeranylgeraniol in agreement with earlier results [5]. Chlorophyll esterified with geranylgeraniol is shown in vivo and in vitro to be the precursor of phytylated chlorophyll. Aminotriazol presumably inhibits the hydrogenation of geranylgeraniol to phytol in the pigment.