This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Heller, W. Articles by Hahlbrock, K. Search for Related Content PubMed PubMed Citation Articles by Heller, W. Articles by Hahlbrock, K. Agricola Articles by Heller, W. Articles by Hahlbrock, K.

Articles

Enzymes of General Phenylpropanoid Metabolism and of Flavonoid Glycoside Biosynthesis in Parsley

Differential Inducibility by Light during the Growth of Cell Suspension Cultures ¹

^a Biologisches Institut II der Universität, Schänzlestrasse 1, D-7800 Freiburg, West Germany

Several enzymes of phenylpropanoid metabolism showed large changes in their inducibility by light during the growth cycle of cell suspension cultures from parsley (Petroselinum hortense Hoffm.). Two of the three enzymes of general phenylpropanoid metabolism (group I) and six of the approximately 13 enzymes of the flavone and flavonol glycoside pathways (group II) were investigated. Both enzymes of group I (phenylalanine ammonia-lyase and 4-coumarate:coenzyme A ligase) were most efficiently induced at two different stages: first, soon after starting a new culture, and second, near the beginning of the stationary phase. In contrast, the enzymes of group II (acetyl-coenzyme A carboxylase, flavanone synthase, chalcone isomerase, UDP-apiose synthase, and at least one of two malonyltransferases) were maximally induced during exponential growth of the culture. This result supports the conclusions drawn from previous data that the two groups are regulated differentially and that the enzymes within each group are regulated in a coordinated manner.