Generation of low copy number and stably expressing transgenic creeping bentgrass plants using minimal gene cassette bombardment |
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Authors: | J Jayaraj G H Liang S Muthukrishnan Z K Punja |
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Institution: | (1) Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada;(2) Department of Agronomy, Kansas State University, Manhattan, KS 66506, USA;(3) Department of Biochemistry, Kansas State University, Manhattan, KS 66506, USA |
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Abstract: | A minimal gene cassette comprised of the ubiquitin (Ubi) promoter + green fluorescent protein (Gfp) gene + Nos terminator DNA sequences, derived from the plasmid vector pPZP201-Gfp was utilized for transformation of creeping bentgrass using particle bombardment. Bentgrass calli bombarded individually
with equivalent amounts of the cassette or whole plasmid DNA were compared for Gfp expression and the GFP-positive calli were subsequently regenerated into plants. Percentage of GFP expressing calli and the
number of GFP spots/calli were significantly higher in calli that were bombarded with the minimal gene cassette when compared
to the whole plasmid. The Gfp expression was stable up to the T2 generation in minimal gene cassette transformants and there was a lower degree of gene silencing. Southern blot analysis
of transgenic plants derived from minimum gene cassette bombardment revealed the presence of single or few copy of the transgene
and fairly simple integration patterns. In comparison, whole plasmid transformants had multiple copies and complex integration
patterns of the transgene. These results illustrate the advantages of using simple gene cassette for stable plant transformation
in bentgrass with possible applications to other plant species. |
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Keywords: | Additional" target="_blank">Additional gene integration green fluorescent protein expression plant transformation |
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