Detection of transgene in early developmental stage by GFP monitoring enhances the efficiency of genetic transformation of pepper |
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Authors: | Min Jung Sun Hee Shin Jeong Mi Park Sung Nam Lee Mi Yeon Lee Ki Hyun Ryu Kee Yoeup Paek Chee Hark Harn |
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Institution: | (1) Biotechnology Institute, Nongwoo Bio Co., Ltd, Yeoju, Gyeonggi, Korea;(2) Department of Environmental and Life Sciences, Seoul Women’s University, Seoul, Korea;(3) Department of Horticultural Science, Chungbuk University, Chungbuk, Korea; |
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Abstract: | In order to establish a reliable and highly efficient method for genetic transformation of pepper, a monitoring system featuring
GFP (green fluorescent protein) as a report marker was applied to Agrobacterium-mediated transformation. A callus-induced transformation (CIT) system was used to transform the GFP gene. GFP expression was observed in all tissues of T0, T1 and T2 peppers, constituting the first instance in which the whole pepper plant has exhibited GFP fluorescence. A total of 38 T0 peppers were obtained from 4,200 explants. The transformation rate ranged from 0.47 to 1.83% depending on the genotype, which
was higher than that obtained by CIT without the GFP monitoring system. This technique could enhance selection power by monitoring
GFP expression at the early stage of callus in vitro. The detection of GFP expression in the callus led to successful identification
of the shoot that contained the transgene. Thus, this technique saved lots of time and money for conducting the genetic transformation
process of pepper. In addition, a co-transformation technique was applied to the target transgene, CaCS (encoding capsaicinoid synthetase of Capsicum) along with GFP. Paprika varieties were transformed by the CaCS::GFP construct, and GFP expression in callus tissues of paprika was monitored to select the right transformant. |
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