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Possibilities of affecting secondary metabolites production in "in vitro" cultures of medicinal plants
Sojková, Kristýna ; Tůmová, Lenka (advisor) ; Martin, Jan (referee)
1 ABSTRACT Possibilities of affecting secondary metabolites production in in vitro cultures of medicinal plants Elicitation is one of the methods used for increasing the production of secondary metabolites.The aim of this work was to affect the flavonoid production in callus and suspension cultures of St. John's Wort (Hypericum perforatum L.). Abiotic elicitor selendioxide in various concentrations (9.012.10-3 mol/l; 9.012.10-4 mol/l; 9.012.10-5 mol/l) was added in in vitro culture. The content of flavonoids was determinated by high performance liquid chromatography (HPLC). The samples were taken after 6, 12, 24, 48, 72, 168 hours after elicitor treatment. Selendioxide raised the production of hyperoside and quercitrin. The highest content of hyperoside (0.2 %) was detected after selendioxide (in concentration of 9.012.10-3 mol/l) treatment and 168 hours sampling in suspension culture. The highest production of quercitrin (0.37 %) was reached after selendioxide treatment (in concentration of 9.012.10-3 mol/l) and 6 hours sampling also in suspension culture. Production of flavonoids in callus cultures wasn't so much affected in comparison with suspension cultures after elicitor treatment. Flavonoid releasing into nutrient medium was also studied. The highest content of hyperosid (1.02 mg/100ml) was found in...
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The effect of elicitors on the secondary metabolites production in vitro cultures -I.
Damaskinos, Antonios ; Tůmová, Lenka (advisor) ; Martin, Jan (referee)
Active compounds have been always originated from plants. Plants though, were able to produce only very low amounts of them and that was the reason for trying many alternative ways of production, one of them being plant tissue culture cultivation. This method is any fragment of living tissue or organ taken from an intact plant or an already existing explant culture, with the intention of growing an artificial growth medium. Even this method though, is not able to produce large amounts compared to extraction from field plants. Elicitation is considered a possible way to increase the production of secondary metabolites. This method used the plant's own defense system, in order to increase the production of secondary metabolites in vitro. The compound which is used to produce the effect is called elicitor. During our experimental work I used as an elicitor the compound Ethephon (2-Chloroethylphosphonic acid) upon callus and suspension cultures of Hypericum perforatum, with intention to observe its effect on flavonoid production. This experiment was based on three different concentrations and six different withdrawal times, being 6, 12, 24, 72, 168 hours. The maximum effect of elicitor was reached with concentration c1 (1mg/100ml) after 12 hours and with concentration c3 (100mg/100ml) after 72 hours.
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Possibilities of affecting secondary metabolites production in "in vitro" cultures of medicinal plants
Sojková, Kristýna ; Tůmová, Lenka (advisor) ; Martin, Jan (referee)
1 ABSTRACT Possibilities of affecting secondary metabolites production in in vitro cultures of medicinal plants Elicitation is one of the methods used for increasing the production of secondary metabolites.The aim of this work was to affect the flavonoid production in callus and suspension cultures of St. John's Wort (Hypericum perforatum L.). Abiotic elicitor selendioxide in various concentrations (9.012.10-3 mol/l; 9.012.10-4 mol/l; 9.012.10-5 mol/l) was added in in vitro culture. The content of flavonoids was determinated by high performance liquid chromatography (HPLC). The samples were taken after 6, 12, 24, 48, 72, 168 hours after elicitor treatment. Selendioxide raised the production of hyperoside and quercitrin. The highest content of hyperoside (0.2 %) was detected after selendioxide (in concentration of 9.012.10-3 mol/l) treatment and 168 hours sampling in suspension culture. The highest production of quercitrin (0.37 %) was reached after selendioxide treatment (in concentration of 9.012.10-3 mol/l) and 6 hours sampling also in suspension culture. Production of flavonoids in callus cultures wasn't so much affected in comparison with suspension cultures after elicitor treatment. Flavonoid releasing into nutrient medium was also studied. The highest content of hyperosid (1.02 mg/100ml) was found in...
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The effect of elicitors on the secondary metabolites production in vitro cultures -I.
Damaskinos, Antonios ; Tůmová, Lenka (advisor) ; Martin, Jan (referee)
Active compounds have been always originated from plants. Plants though, were able to produce only very low amounts of them and that was the reason for trying many alternative ways of production, one of them being plant tissue culture cultivation. This method is any fragment of living tissue or organ taken from an intact plant or an already existing explant culture, with the intention of growing an artificial growth medium. Even this method though, is not able to produce large amounts compared to extraction from field plants. Elicitation is considered a possible way to increase the production of secondary metabolites. This method used the plant's own defense system, in order to increase the production of secondary metabolites in vitro. The compound which is used to produce the effect is called elicitor. During our experimental work I used as an elicitor the compound Ethephon (2-Chloroethylphosphonic acid) upon callus and suspension cultures of Hypericum perforatum, with intention to observe its effect on flavonoid production. This experiment was based on three different concentrations and six different withdrawal times, being 6, 12, 24, 72, 168 hours. The maximum effect of elicitor was reached with concentration c1 (1mg/100ml) after 12 hours and with concentration c3 (100mg/100ml) after 72 hours.
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