Systems approaches to unraveling plant metabolism: identifying biosynthetic genes of secondary metabolic pathways.

The diversity of useful compounds produced by plant secondary metabolism has stimulated broad systems biology approaches to identify the genes involved in their biosynthesis. Systems biology studies in non-model plants pose interesting but addressable challenges, and have been greatly facilitated by the ability to grow and maintain plants, develop laboratory culture systems, and profile key metabolites in order to identify critical genes involved their biosynthesis. In this chapter we describe a suite of approaches that have been useful in Actaea racemosa (L.; syn. Cimicifuga racemosa, Nutt., black coshosh), a non-model medicinal plant with no genome sequence and little horticultural information available, that have led to the development of initial gene-metabolite relationships for the production of several bioactive metabolites in this multicomponent botanical therapeutic, and that can be readily applied to a wide variety of under-characterized medicinal plants.