Characterization of a Unique Pair of Ferredoxin and Ferredoxin NADP Reductase Isoforms That Operates in Non-Photosynthetic Glandular Trichomes.

Our recent investigations indicated that isoforms of ferredoxin (Fd) and ferredoxin NADP reductase (FNR) play essential roles for the reductive steps of the 2-methyl-D-erythritol 4-phosphate (MEP) pathway of terpenoid biosynthesis in peppermint glandular trichomes (GTs). Based on an analysis of several transcriptome data sets, we demonstrated the presence of transcripts for a leaf-type FNR (), a leaf-type Fd (), a root-type FNR (), and two root-type Fds ( and ) in several members of the mint family (Lamiaceae). The present study reports on the biochemical characterization of all Fd and FNR isoforms of peppermint ( × L.