title: Antioxidant capacity manipulation in transgenic potato tuber by changes in phenolic compounds content.
abstract: The main goal of this study was to generate potato tubers with increased levels of flavonoids and thus modified antioxidant capacities. To accomplish this, the vector carrying multigene construct was prepared and several transgenic plants were generated, all overexpressing key biosynthesis pathway enzymes. The single-gene overexpression or simultaneous expression of genes encoding chalcone synthase (CHS), chalcone isomerase (CHI), and dihydroflavonol reductase (DFR) resulted in a significant increase of measured phenolic acids and anthocyanins. The increase in phenolic compounds synthesis is accompanied by decreases in starch and glucose levels in transgenic plants. The flavonoids-enriched plants showed improved antioxidant capacity; however, there is a complex relationship between antioxidant capacity and flavonoids content, suggesting the great participation of other compounds in the antioxidant potential of the plants. These other compounds are not yet recognized.
authors.affiliation: Institute of Genetics and Microbiology and Institute of Biochemistry and Molecular Biology, Wroclaw University, Przybyszewskiego 63/77, 51-148 Wroclaw, Poland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Lukaszewicz
authors.forename: Iwona
authors.initials: I
authors.lastname: Matysiak-Kata
authors.forename: Jacek
authors.initials: J
authors.lastname: Skala
authors.forename: Izabela
authors.initials: I
authors.lastname: Fecka
authors.forename: Wojciech
authors.initials: W
authors.lastname: Cisowski
authors.forename: Jan
authors.initials: J
authors.lastname: Szopa
mesh_terms: D000217:Acyltransferases / Q000235:genetics; D000429:Alcohol Oxidoreductases / Q000235:genetics; D000872:Anthocyanins / Q000032:analysis; D000975:Antioxidants / Q000032:analysis*; D002109:Caffeic Acids / Q000032:analysis; D002726:Chlorogenic Acid / Q000032:analysis; D019753:Intramolecular Lyases / Q000235:genetics; D010636:Phenols / Q000032:analysis*; D030821:Plants, Genetically Modified; D011198:Solanum tuberosum / Q000737:chemistry* / Q000201:enzymology / Q000235:genetics*
chemical_list: D000872:Anthocyanins; D000975:Antioxidants; D002109:Caffeic Acids; D010636:Phenols; D002726:Chlorogenic Acid; D000429:Alcohol Oxidoreductases; C056570:dihydroflavanol 4-reductase; D000217:Acyltransferases; C020141:flavanone synthetase; D019753:Intramolecular Lyases; C019865:chalcone isomerase; C040048:caffeic acid