Endogenous Cytokinins in Medicinal Basidiomycetes Mycelial Biomass
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Experimental articles UDK 606:615.322:631:871 doi: 10.15407/biotech9.01.055 ENDOGENOUS CYTOKININS IN MEDICINAL BASIDIOMYCETES MYCELIAL BIOMASS N. P. Vedenicheva G. A. Al-Maali N. Yu. Mytropolska Kholodny Institute of Botany of the National Academy O. B. Mykhaylova of Sciences of Ukraine, Kyiv N. A. Bisko I. V. Kosakivska E-mail: [email protected] Received 10.02.2016 The aim of the research was to study the cytokinins production by medicinal basidial mushrooms. Cytokinins were for the first time identified and quantified in mycelial biomass of six species (Ganoderma lucidum, Trametes versicolor, Fomitopsis officinalis, Pleurotus nebrodensis, Grifola frondosa, Sparassis crispa) using HPLC. Trans- and cis-zeatin, zeatin riboside, zeatin-O-glucoside, isopentenyladenosine, isopentenyladenine were found but only one species (G. lucidum, strain 1900) contained all these substances. The greatest total cytokinin quantity was detected in F. officinalis, strain 5004. S. crispa, strain 314, and F. officinalis, strain 5004, mycelial biomass was revealed to have the highest level of cytokinin riboside forms (zeatin riboside and isopentenyladenosine). The possible connection between medicinal properties of investigated basidiomycetes and of cytokinins is discussed. S. crispa, strain 314, and F. officinalis, strain 5004, are regarded as promising species for developing biotechnological techniques to produce biologically active drugs from their mycelial biomass. As one of the potential technological approaches there is proposed fungal material drying. Key words: medicinal mushrooms, mycelial biomass, cytokinins. Mushrooms form a special kingdom meristems initiation and activity, delay of living creature — Fungi. They possess leaves senescence, inhibit roots growth and both plant and animal features in their cell branching, control sink/source relationships, structure and metabolism. The most important seeds germination, nutrient uptake and regulation system of plants and animals is response to biotic and abiotic stresses [4, 5]. a hormonal one, all vital functions of these Naturally occurring cytokinins are adenine organisms are under hormonal control. derivatives which have the similar structure Hormones trigger all life programs without but not equivalent functions. Hormone exceptions and control their running during molecules with the side chain structure ontogenesis. The action of such system in fungi variations are likely to mediate different remains unknown. More than 35 fungi species biological signals. The participation of trans- are able to synthesize the phytohormones, but zeatin and isopentenyladenine in long-distance a functional significance of these substances signal transmission in acropetal and basipetal has not been investigated [1]. The main directions along plant stem correspondently is attention was concentrated on microscopic assumed [6]. phytopathogenic fungi causing an abnormal Phytopathogenic fungi are shown to growth of host plants tissues and tumours produce high concentrations of cytokinins in formation. One of the specific symptoms of culture [7, 8]. The incorporation of 14C-adenine fungal infection is a considerable cytokinins into cytokinins in Fusarium moniliforme levels increase in these tissues (several times confirmed the ability of this fungus to higher than those in healthy ones) [2, 3]. synthesize hormone de novo [9]. Biotrophic Cytokinins are polyfunctional fungus Claviceps purpurea produced phytohormones that are involved in plants substantial quantities of cytokinins in culture growth and development regulation. They and expressed the cytokinins biosynthesis stimulate cells division and shoot apical enzymes genes [2]. The general strategy of 55 BIOTECHNOLOGIA ACTA, V. 9, No 1, 2016 parasitic fungi is to use cytokinins for host Materials and Methods plant growth manipulations. They not only Biological material can apply hormones synthesized by themselves The following basidial macromycetes were but change cytokinins biosynthesis genes screened for cytokinins content: Pleurotus expression in occupied plant [10, 11]. nebrodensis (Inzenga) Quel. , Grifola frondosa Until now there are few data on the (Dicks: Fr.) S.F.Gray, Fomitopsis officinalis cytokinins occurrence and functioning in (Vill.) Bondartsev et Singer, Sparassis crispa basidial mushrooms. Cytokinins activity (Fr.) Fr., Ganoderma lucidum (Curtis) P. Karst was for the first time detected in their and Trametes versicolor (L.) Lloyd. All of fruit bodies by bioassays in the 70s of the them are the valuable fungi species with long XX century. Cytokinins activity corresponding history of applying in oriental medicine and to zeatin and zeatin riboside was detected in ethnoscience for many diseases treatment and Agaricus bisporus (J. E. Lange) Imbach and prevention. We investigated the pure cultures Pleurotus sajor-caju (Fr.) Singer [12], in six of F. officinales 5004, S. crispa 314, G. lucidum species of genus Rhizopogon and twenty two 1900, T. versicolor 353, G. frondosa 976 and species of genus Hebeloma [13]. The content P. nebrodensis 2035 from the National of zeatin riboside in Pleurotus ostreatus Ukrainian Culture Collection of Mushrooms of (Jacq.) P. Kumm. basidiomes [14], zeatin — Kholodny Institute of Botany of the National in Lentinus tigrinus (Bull.) Fr. and Laetiporus Academy of Sciences of Ukraine. sulphurous (Bull.) Murrill [15], trans- zeatin — in eighteen macromycetes species, Mushrooms cultivation particularly in L. tigrinus, Boletus impolitus To obtain the mycelial biomass of above Fr., Ptychoverpa bohemica (Krombh.) Boud., mentioned strains we cultivated them in 250 ml Volvariella speciosa (Fr.) Singer, Amanita Erlenmeyer flasks with 50 ml liquid medium at gemmata (Fr.) Bertill. etc. was determined thermostat conditions (26 ± 1 C) in darkness by high performance liquid chromatography (Fig. 1). Inoculation with physiologically (HPLC) [16]. Recently, combination of HPLC active mycelium in proportion 10% to total with electrospray ionization tandem mass volume was carried out in accordance with spectrometry allowed to determine seven cytokinins in twenty species of forest fungi [3]. method developed for basidiomycetes [21]. Last years, a higher interest to growth Microbiological control of nutrient medium regulating substances in edible mushrooms and seeding material purity was fulfilled fruit bodies is connected with necessity to before inoculation. For cultivation of F. offi- produce ecologically pure protein products cinales 5004 and S. crispa 314 the following and to increase cultivated mushrooms yield. liquid nutrient medium was used (g/l): Additionally, almost all basidiomycetes possess glucose — 30,0; NH4 NO3 — 3,5; KCl — 0,5; the medicinal properties and that is why K2HPO4 — 1,0; MgSO4·7H2O — 0,5; beer wort medicinal mushrooms science devoted to study (15 in accordance with Baling method) — of these fungi characteristics is developing 115 ml; рН — 5,0. For cultivation of G. lucidum successfully in 21st century [17]. It is not yet 1900, T. versicolor 353, G. frondosa 976 and completely known what specific components P. nebrodensis 2035 such liquid nutrient medium of biochemical mushrooms composition are was used (g/l): glucose — 25,0; peptone — 3,0; effective therapeutic agents. At the same yeast extract — 3,0; KH2PO4 — 1,0; K2HPO4 — time, therapeutic properties of cytokinins, in 1,0l; MgSO4·7H2O — 0,25; рН — 6,5. Mediums particular, anticancer and immunomodulatory acidity was maintained at necessary pH levels action, have been proved now [18–20]. The by 1 N КОН and 1 N НСl solutions addition. question about possible interco nnection between medicinal mushrooms effects and Cytokinins analysis cytokinins synthesized in their cells arises. The cytokinins extraction and purification We have previously established that cytokinins from mushrooms mycelial biomass and final content in Lentinus edodes (Berk.) Singer determination in samples were based on the mycelium is by an order in magnitude higher methods described for plants [22] with some than that of fruit bodies (data not published). modifications. Choice and combination of Taking in consideration all above mentioned procedures and their adaptation to work with we aimed to study the cytokinin production mushrooms mycelial biomass were realized for by mycelial biomass of basidial mushrooms the first time. The sample (10 g of mycelial and to determine the species with the higher biomass) was homogenized in 80% ethanol productivity. solution. Homogenous material was mixed 56 Experimental articles Bio-Rad (USA) containing ionexchange resin A Dowex 50Wx8 (Serva, Germany) in H+ form. The column was rinsed with water, the sample was eluated by 0,1 N ammonia and eluate was evaporated under vacuum. Then, sample was purified by thin layer chromatography (TLC). The dry residue was dissolved in 1 ml of 96% ethanol and applied on TLC plates Silicagel 60 F254 (Merck, Germany) 2020 cm. The plates were run in solvent systems isopropanol:ammonia:water (10:1:1 by volume) and dried. Zones correspondent to the cytokinins standards were detected under UV 254 in chemoscope Desaga (Germany) and then eluated with 96% ethanol. The final cytokinins identification and determination were performed by HPLC (Agilent 1200 LC, USA) using Eclipse XDB-C 18 column (2,1150 mm), particles size 5 μм. Elution was carried out with solvents system methanol:water (37:63 B by volume). Data were analyzed and processed by software Chem Station, version В.03.01 on line. Standard solutions of trans- and cis- zeatin,