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http://dx.doi.org/10.7783/KJMCS.2013.21.1.32

Overexpression of Farnesyl Diphosphate Synthase by Introducing CaFPS Gene in Panax ginseng C. A. Mey.  

Park, Hong Woo (Department of Herbal Crop Research, NIHHS, RDA)
Kim, Ok Tae (Department of Herbal Crop Research, NIHHS, RDA)
Hyun, Dong Yun (Department of Herbal Crop Research, NIHHS, RDA)
Kim, Yong Bum (Department of Herbal Crop Research, NIHHS, RDA)
Kim, Jang Uk (Department of Herbal Crop Research, NIHHS, RDA)
Kim, Young Chang (Department of Herbal Crop Research, NIHHS, RDA)
Bang, Kyong Hwan (Department of Herbal Crop Research, NIHHS, RDA)
Cha, Seon Woo (Department of Herbal Crop Research, NIHHS, RDA)
Choi, Jae Eul (College of Agriculture & Life Sciences, Chungnam National University)
Publication Information
Korean Journal of Medicinal Crop Science / v.21, no.1, 2013 , pp. 32-38 More about this Journal
Abstract
FPS (farnesyl diphosphate synthase) plays an essential role in organ development in plants. However, FPS has not previously been identified as a key regulatory enzyme in triterpene biosynthesis. In order to investigate the effect of FPS on ginsenosides biosynthesis, we over-expressed FPS of Centella asiatica (CaFPS) in Panax giseng adventitious roots. PCR analysis showed the integrations of the CaFPS and hygromycin phosphotransferase genes and we ultimately selected three lines. The result of Southern blot analysis demonstrated the introduction of the CaFPS gene into genome of ginseng. In addition, the results of RT-PCR analysis revealed that CaFPS gene overexpression induced an accumulation of its transcription in the ginseng adventitious roots. To determine whether or not the overexpression of the CaFPS gene contributes to the downstream gene expression associated with triterpene biosynthesis, the level of mRNAs was analyzed by real-time PCR. The result showed that no differences were detected in any expression of all genes. To determine quantitatively the content of ginsenosides in transgenic ginseng adventitious roots, HPLC analysis was conducted. The content of total 7 ginsenosides was increased to 1.8, 1.4, and 1.7 times than that of the controls, respectively. This indicated that the overexpression of CaFPS in ginseng adventitious roots causes an increase in ginsenoside content, although down stream genes of FPS gene were suppressed by CaFPS overexpression.
Keywords
Panax ginseng; CaFPS (Centella asiatica Farnesyl Diphosphate Synthase); Ginsenoside;
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Times Cited By KSCI : 4  (Citation Analysis)
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