Effect of Plant Growth Regulators on Growth Patterns and Enzymatic Antioxidant Activities in Hypericum calycinum Shoot Cultures

1 Sofia University “St. Kliment Ohridski”, Faculty of Biology, BG – 1164 Sofi a, Bulgaria
2 Zürcher Hochschule für angewandte Wissenschaften (ZHAW), Life Sciences und Facility Management, Institut für Biotechnologie, Wдdensvil, Switzerland
3 Bulgarian Academy of Sciences, Institute of Organic Chemistry with Centre of Phytochemistry, BG – 1113 Sofia, Bulgara


TRENEVA, G., Y. MARKOVSKA, E. WOLFRAM and K. DANOVA, 2014. Effect of plant growth regulators on growth patterns and enzymatic antioxidant activities in Hypericum calycinum shoot cultures. Bulg. J. Agric. Sci., Supplement 1: 46–50


Hypericum calycinum L. (section Ascyreia) is a species of the Hypericum genus, relative to the medicinal plant H.perforatum (St. Jonn’s worth). Unlike the widely studied H. perforatum, it is characterized by the lack of hypericins production. However, research has revealed its commensurable antidepressant activity, as compared with the latter species,
and shown the presence of polyphenolics with marked radical scavenging activity. In order to develop an in vitro system with the potential of a novel source of bioactive constituent’s characteristic for the Hypericum genus, we initiated in vitrocultures of H. calycinum. In the present work we studiy the effect of exogenous BA and IBA treatments on the developmental patterns, enzymatic and non-enzymatic antioxidant defence of hypericin non-producing Hypericum calycinumshoot cultures. It was shown that supplementation of PGR led to stimulation of phenylalanine ammonia-lyase and superoxide dismuthase, as well as non-enzymatic antioxidant glutathione. However, they inhibited glutathione reductase, as well as lowered the levels of fl avonoids, ascorbate and dehydroascorbate in comparison with plant growth regulators-free control. Further on, it was established that elevation of IBA concentration slightly stimulated axillary shoot formation and shoot length, but inhibited polyphenolic levels in vitro. These results are in agreement with our previous results of interrelations between biomass formation and polyphenolics production in other Hypericum species in vitro. An in vitroculture system optimization is in progress in order to increase biomass production and retain biosynthetic capacity of the species.

Key words: Hypericum calycinum, shoot culture, enzymatic antioxidant defense, polyphenolics in vitro
Abbreviations: BA – benzyl adenine, IBA – indole-3-butyric acid, PGR – plant growth regulators, DPPH - 2,2-diphenyl-1-picrylhydrazyl, NO – nitric oxide, BAS – Bulgarian Academy of Sciences, PAL – Phenylalanine ammonia-lyase, SOD – superoxide dismuthase, GR – glutathione reductase, APX – ascorbate peroxidase, CAT – catalase, AsA – ascorbate, DHA – dehydrosacorbate, GSSG – oxidized glutathione, GSH – reduced glutathione, NADPH – Reduced nicotinamide adenine dinucleotide phosphate, KH2PO4 – potassium phosphate monobasic, MgCl2 – magnesium chloride, EDTA – Ethylenediaminetetraacetic acid, NaAA – sodium ascorbate, H2O2 – hydrogen peroxide, DTNB – 5,50-dithiobis – (2-nitrobenzoic acid).


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