Transformation of sweet potato tissues with green-fluorescent protein gene |
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Authors: | Stacy Winfield Rodrick Lawton Henry Daniell Sarwan K Dhir |
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Institution: | (1) Plant Science, Fort Valley State University, 141 Stallworth Research Bldg., 31030-1017 Fort Valley, Georgia;(2) Department of Molecular Biology and Microbiology, University of Central Florida, 32816-2360 Orlando, Florida;(3) Present address: Department of Biochemistry, Purdue University, 47907 West Lafayette, IN;(4) Present address: Medical College of Georgia, 1120 15th Street, 30912 Augusta, GA |
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Abstract: | Summary The expression of the green-fluorescent protein (GFP) gene from Aequorea victoria (jellyfish) was analyzed by transient and stable expression in sweet potato Ipomoea batatas L. (Lam.) ev. Beauregard tissues by electroporation and particle bombardment. Leaf and petiole segments from in vitro-raised young plantlets were used for protoplast isolation and electroporation. Embyrogenic callus was also produced from
leaf segments for particle bombardment experiments. A buffer solution containing 1×106 protoplasts ml−1 was mixed with plasmid DNA containing the GFP gene, and electroporated at 375 V cm−1. Approximately 25–30% of electroporated mesophyll cell protoplasts subsequently cultured in KM8P medium regenerated cell
walls after 48 h. Of these, 3% emitted bright green fluorescence when exposed to UV-blue light at 395 nm. Transformed cells
continued to grow after embedding in KM8P medium solidifed with 1.2% SeaPlaque agarose. Stable expression of GFP was observed
after 4 wk of culture in approximately 1.0% of the initial GFP positive cells (27.5 GFP positive micro callases out of 3024
cells which transiently expressed GFP 48 h after electroporation). In a separate experiment, 600–700 bright green spots were
observed per plate 48 h after bombarding leaf segments or embryogenic cellus. In bombarded cultures, several stable GEP-expressing
sectors were observed in leafderived embryogenic callus grown without selection for 4 wk. These results show that GFP gene
expression can occur in various sweet potato tissues, and that it may be a useful sereenable marker to improve transformation
efficiency and obtain transgenic sweet potato plants. |
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Keywords: | sweet potato Ipomoea batatas L (Lam ) green-fluorescent protein electroporation particle bombardment protoplasts intact cells stable expression |
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