Abstract
ABSTRACT Over 15 genetically distinct populations and 10 cultivars of St. John's wort (Hypericum perforatum) from Armenia and North America were surveyed to identify superior plant germplasm as sources of the secondary metabolites hypericin, pseudohypericin, and hyperforin. Remarkably high concentrations (over 15% of dry weight) of the antide-pressive metabolite, hyperforin was detected in a population of H. perforatum collected in Armenia, while North American samples and cultivars had relatively high levels of hypericins (to 0.23 percent of dry weight). In vitro studies indicated that shoot cultures are excellent sources for both hypericins and hyperforin. Concentrations of hypericins in shoot cultures reached six times (1.4% of dry weight) that of wild-collected or greenhouse-grown plants, while the concentrations of hyperforin were lower.
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