Changes in the contents of main secondary metabolites in two Turkish Hypericum species during plant development.

Abstract:

CONTEXT:The genus Hypericum (Guttiferae) has received considerable scientific interest as a source of biologically active compounds. OBJECTIVE:The study determined the morphogenetic and ontogenetic variation in the main bioactive compounds of two Hypericum species, namely, Hypericum aviculariifolium subsp. depilatum var. depilatum (Freyn and Bornm.) Robson var. depilatum and Hypericum orientale L. through HPLC analyses of whole plants as well as individual plant parts (stems, leaves, and reproductive tissues). MATERIALS AND METHODS:The plant materials were harvested at five phenological stages: vegetative, floral budding, full flowering, fresh fruiting, and mature fruiting; dried at room temperature, then assayed for chemical content. RESULTS:In H. aviculariifolium, no kaempferol accumulation was observed and the highest level of hypericin, pseudohypericin, and quercitrin was reached at full flowering (0.71, 1.78, and 4.15 mg/g DW, respectively). Plants, harvested at floral budding produced the highest amount of rutin, hyperoside, and isoquercitrine (32.96, 2.42, 1.52 mg/g DW, respectively). H. orientale did not produce hypericin, pseudohypericin, or kaempferol. Rutin, hyperoside, and isoquercetine levels were the highest at floral development (1.76, 11.85, and 1.21 mg/g DW, respectively) and plants harvested at fresh fruiting produced the highest amount of quercitrine and quercetine (0.20 and 1.30 mg/g DW, respectively). DISCUSSION:For the first time, the chemical composition of the Turkish species of Hypericum was monitored during the course of ontogenesis to determine the ontogenetic and morphogenetic changes in chemical content. CONCLUSIONS:Plant material should be harvested during flower ontogenesis for medicinal purposes in which the content of many bioactive substances tested reached their highest level.

journal_name

Pharm Biol

journal_title

Pharmaceutical biology

authors

Cirak C,Radusiene J,Camas N,Caliskan O,Odabas MS

doi

10.3109/13880209.2012.733012

subject

Has Abstract

pub_date

2013-03-01 00:00:00

pages

391-9

issue

3

eissn

1388-0209

issn

1744-5116

journal_volume

51

pub_type

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