JBB Vol. 112 表紙画像

Plants produce a wide variety of isoprenoid compounds. Sesquiterpenes, triterpenes, and sterols are biosynthesized via the mevalonate (MVA) pathway. The enzyme 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR) catalyzes the first rate-limiting step in the MVA pathway. The model plant Arabidopsis thaliana contains two differentially expressed HMGR genes, HMG1 and HMG2. Histochemical GUS staining of transgenic plants carrying promoter::GUS reporter fusions showed that HMG1 is expressed mainly in veins, but HMG2 is expressed exclusively in three-branched trichomes (picture) that differentiate from single epidermal cells on the leaves.

The image was provided by Dr. Hikaru Seki at Plant Metabolism and Cell Technology Laboratory, Department of Biotechnology, Graduate School of Engineering, Osaka University.

 

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