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Gibberellins enhance plant growth and ginsenoside content in Panax ginseng
J Plant Biotechnol 2021;48:186-192
Published online September 30, 2021
© 2021 The Korean Society for Plant Biotechnology.

Chang Pyo Hong ・Gwi Yeong Jang ・Hojin Ryu

Theragen Bio Co., Ltd, Suwon 16229, Republic of Korea
Department of Herbal Crop Research, NIHHS, RDA, Eumseong 27709, Republic of Korea
Department of Biology, Chungbuk National University, Cheongju 28644, Republic of Korea
Department of Biological Sciences and Biotechnology, Chungbuk National University, Cheongju 28644, Republic of Korea
Correspondence to: e-mail: hjryu96@chungbuk.ac.kr
These authors contributed equally to this work as the first authors
Received September 4, 2021; Revised September 23, 2021; Accepted September 23, 2021.
cc This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The roots of Korean ginseng (Panax ginseng) have a long history of usage as a medicinal drug. Ginsenosides, a group of triterpenioid saponins in ginseng, have been reported to show important pharmacological effects. Many studies have attempted to identify the ginsenoside synthesis pathways of P. ginseng and to increase crop productivity. Recent studies have shown that exogenous gibberellin (GA) treatments promote storage root secondary growth by integration of the modulating cambium stem cell homeostasis with a secondary cell wall-related gene network. However, the dynamic regulation of ginsenoside synthesis related genes and their contents by external signaling cues has been rarely evaluated. In this study, we confirmed that GA treatment not only enhanced the secondary growth of P. ginseng storage roots, but also significantly enriched the terpenoid biosynthesis process in RNA-seq analysis. Consistently, we also found that the expression of most genes involved in the ginsenoside synthesis pathways, including those encoding methylerythritol-4-phosphate (MEP) and mevalonate (MVA), and the saponin content in both leaves and roots was increased by exogenous GA application. These results can be used in future development of biotechnology for ginseng breeding and enhancement of saponin content.
Keywords : Panax ginseng, GA, Hormone, Ginsenoside, Terpenoid biosynthesis


September 2021, 48 (3)
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