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http://dx.doi.org/10.5352/JLS.2010.20.2.292

Functional Analysis of a Grapevine UDP-Glucose Flavonoid Glucosyl Transferase (UFGT) Gene in Transgenic Tobacco Plants  

Park, Ji-Yeon (Department of Molecular Biology, BK21 Graduate Program for RNA Biology and Institute of Nanosensor and Biotechnology, Dankook University)
Park, Sung-Chool (Department of Molecular Biology, BK21 Graduate Program for RNA Biology and Institute of Nanosensor and Biotechnology, Dankook University)
Pyee, Jae-Ho (Department of Molecular Biology, BK21 Graduate Program for RNA Biology and Institute of Nanosensor and Biotechnology, Dankook University)
Publication Information
Journal of Life Science / v.20, no.2, 2010 , pp. 292-297 More about this Journal
Abstract
Anthocyanin, a phenolic compound, is a pigment that shows blue or red color in the fruit, petal and other tissues. It is an important factor in grape berry skin pigment and accumulates only in the skin. This skin-specific accumulation of anthocyanin has been reported to be regulated by the ufgt gene which encodes UDP-glucose: flavonoid 3-O-glucosyltransferase that participates in the biosynthesis of anthocyanin. The ufgt gene is expressed only in berry skin, while the other genes involved in the biosynthetic pathway are expressed in both skin and flesh tissues. In order to determine whether anthocyanin accumulation is primarily regulated by compartment of UFGT, a ufgt cDNA clone was isolated from grape berry, its open reading frame was ligated in pBI121 vector in either a sense or an antisense orientation under the control of the CaMV35S promoter and the recombinant constructs were incorporated into tobacco plants. Several transgenic lines were selected and characterized to determine the level of expression of the grapevine ufgt transcript and endogenous homologs of tobacco. Compared to the wild-type, the amount of anthocyanins in sense transgenic plants increased by 44%, while the amount of anthocyanins in antisense transgenic plants decreased by 88%. In addition, the color of flowers became intense in the sense transgenic plants. These results suggest that over-expression or repression of the ufgt gene affected the accumulation of anthocyanin in flowers of tobacco.
Keywords
Anthocyanin; ufgt gene; grapevine; tobacco;
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