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1

Benzopyrans in Hypericum polyanthemum Klotzsch ex Reichardt cultured in vitro

100%
Bernardi A. P. M., Maurmann N., Rech S. B., Von Poser G.
Acta Physiologiae Plantarum
|
2007
|
tom 29
|
nr 2
Hypericum polyanthemum Klotzsch ex Reichardt, an endemic species of Southern Brazil, was micropropagated on MS medium supplemented with 1.78 µM BAP. Shoot proliferation and rooting was achieved on hormone-free medium and plantlets survived acclimatization. The bioactive compounds: 6-isobutyryl-5,7-dimethoxy-2,2-dimethylbenzopyran (HP1), 7-hydroxy-6-isobutyryl-5-methoxy2,2-dimethyl-benzopyran (HP2) and 5-hydroxy-6-isobutyryl-7-methoxy-2,2-dimethyl-benzopyran (HP3) were quantified in the leaves, stems and roots of propagated and acclimatized plantlets and compared with the field-grown plants. The HPLC analysis revealed that the three benzopyrans are accumulated in the aerial parts and the concentration varied with the age of the plant whereas the roots were capable of accumulating only HP3. Greatest yield of HP1 (7.12 mg/g DW) was quantified in the leaves of the acclimatized plantlets, whereas the flowers of the plants from natural habitat displayed higher amounts of HP2 (11.04 mg/g DW) and HP3 (13.99 mg/g DW).
2

Phenolic compounds accumulation in Hypericum ternum propagated in vitro and during plant development acclimatization

76%
Pinhatti A. V., Nunes J. d. M., Maurmann N., Rosa L. M. G., Poser G. L., Rech S. B.
Acta Physiologiae Plantarum
|
2010
|
tom 32
|
nr 4
The phenolic compound content of Hypericum ternum was investigated after micropropagation establishment and during acclimatization over the phenological development of the plant. Plantlets cultured in vitro on full Murashige and Skoog medium without growth regulators displayed higher phenolic compound yields, were acclimatized, and field grown. Production of total phenolic compounds as well as hyperoside, chlorogenic acid, quercitrin, guaijaverin, isoquercitrin, and uliginosin B were quantified at vegetative, flowering and fructification stages, and different plant organs (roots, stems, leaves and reproductive parts) showing that reproductive parts at flowering stage and the leaves at fructification stage were the main repository site of secondary metabolites, except for uliginosin B. The stems were the least accumulative organ, while the roots accumulated only hyperoside and uliginosin B. Moreover, the accumulation of most of the flavonoids and uliginosin B in acclimatized plants surpassed the levels found in the wild plant, warranting further research with the species.
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