| induction of hypericins and hyperforins in hypericum perforatum in response to damage by herbivores. | plants respond to herbivore and pathogen attack by a variety of direct and indirect mechanisms that include the induction of secondary metabolites. the phytomedicinal plant hypericum perforatum l. produces two different classes of secondary metabolites: hyperforins, a family of antimicrobial acylphloroglucinols; and hypericins, a family of phototoxic anthraquinones exhibiting antimicrobial, antiviral, and antiherbivore properties in vitro. to determine whether these compounds are part of the her ... | 2003 | 14969354 |
| spillover of a biological control agent (chrysolina quadrigemina) onto native st. johnswort (hypericum punctatum). | biological control agents may have unintended effects on native biota, particularly species that are closely related to the target invader. here, we explored how chrysolina quadrigemina, a beetle introduced to control the invasive weed hypericum perforatum, impacts native h. punctatum in tompkins county, new york, usa. using a suite of complementary field surveys and experimental manipulations, we examined beetle preference for native and exotic hypericum species and whether beetle herbivory inf ... | 2016 | 27069816 |