title: Herbal drug quality and phytochemical composition of Hypericum perforatum L. affected by ash yellows phytoplasma infection.
abstract: Qualitative/quantitative phytochemical variations were observed in dried flowering tops of cultivated Hypericum perforatum L. cv. Zorzi infected by phytoplasmas of the "ash yellows" class, identified by direct and nested polymerase chain reaction (PCR); this is the first report of ribosomial group 16SrVII phytoplasmas in St. John's Wort. Methanolic extracts of healthy and infected plants were separated by reversed phase high-performance liquid chromatography to quantify naphthodianthrones and flavonoids, while essential oils were analyzed by means of gas chromatography (GC)-GC/MS. The affected plants exhibited decreased amounts of rutin (1.96 +/- 0.23 vs 4.96 +/- 0.02 mg/g), hyperoside (2.38 +/- 0.21 vs 3.04 +/- 0.05 mg/g), isoquercitrin (1.47 +/- 0.04 vs 3.50 +/- 0.08 mg/g), amentoflavone (0.12 +/- 0.01 vs 0.39 +/- 0.02 mg/g), and pseudohypericin (1.41 +/- 0.23 vs 2.29 +/- 0.07 mg/g), whereas the chlorogenic acid content was doubled (1.56 +/- 0.11 vs 0.77 +/- 0.02 mg/g). Hypericin, quercitrin, and quercetin contents were not severely affected. The essential oil yield was drastically reduced in infected material (0.11 vs 0.75% in healthy material) and revealed an increased abundance of sesquiterpenes (beta-caryophyllene, delta-elemene, and germacrene D, in particular) and a matching decrease in monoterpene hydrocarbons and aliphatics. The consequences that the phytopathological condition of cultivated H. perforatum plants has on the commercial quality, market value, and therapeutic efficacy are outlined.
authors.affiliation: Dipartimento di Biologia Evolutiva e Funzionale, Sez. Biologia Vegetale e Orto Botanico, Università degli Studi di Parma, Parco Area delle Scienze 11A, 43100 Parma, Italy. bruni@biol.unipr.it
authors.forename: Renato
authors.initials: R
authors.lastname: Bruni
authors.forename: Federica
authors.initials: F
authors.lastname: Pellati
authors.forename: Maria Grazia
authors.initials: MG
authors.lastname: Bellardi
authors.forename: Stefania
authors.initials: S
authors.lastname: Benvenuti
authors.forename: Samanta
authors.initials: S
authors.lastname: Paltrinieri
authors.forename: Assunta
authors.initials: A
authors.lastname: Bertaccini
authors.forename: Alberto
authors.initials: A
authors.lastname: Bianchi
mesh_terms: D002851:Chromatography, High Pressure Liquid; D020902:Hypericum / Q000737:chemistry* / Q000382:microbiology*; D009822:Oils, Volatile / Q000032:analysis; D045582:Phytoplasma; D010935:Plant Diseases / Q000382:microbiology*; D010936:Plant Extracts / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D011786:Quality Control
chemical_list: D009822:Oils, Volatile; D010936:Plant Extracts