Abstract
Key message
A rapid and efficient Agrobacterium -mediated transformation system in sorghum has been developed employing standard binary vectors and bar gene as a selectable marker.
Abstract
Sorghum (Sorghum bicolor) is an important food and biofuel crop worldwide, for which improvements in genetic transformation are needed to study its biology and facilitate agronomic and commercial improvement. Here, we report optimization of regeneration and transformation of public sorghum genotype P898012 using standard binary vectors and bar gene as a selectable marker. The tissue culture regeneration time frame has been reduced to 7–12 weeks with a yield of over 18 plants per callus, and the optimized transformation system employing Agrobacterium tumefaciens strain AGL1 and the bar with a MAS promoter achieved an average frequency over 14 %. Of randomly analyzed independent transgenic events, 40–50 % carry single copy of integrated T-DNA. Some independent transgenic events were derived from the same embryogenic callus lines, but a 3:1 Mendelian segregation ratio was found in all transgenic events with single copy as estimated by Southern blots. The system described here should facilitate studies of sorghum biology and agronomic improvement.
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Acknowledgments
The authors thank Dr. Yinghua Huang (USDA-ARS, OK) for providing sorghum genotypes, Dr. Lu Lu for informative suggestions and Drs. David Braun, David Mendoza and Xi Xiong for helpful discussions. Thanks are also extended to Neng Wan for his help with greenhouse work and Cuong X. Nguyen for help with GUS assay. This research was supported by Vietnam Educational Foundation (VIED) (awarded to P.T. Do). The authors have no conflict of interest to declare.
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Communicated by B. Li.
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299_2016_2019_MOESM1_ESM.pdf
Fig. S1 Sorghum root formation. a Sorghum root quality in different rooting media. b Root induction frequency for given timelines (PDF 23 kb)
299_2016_2019_MOESM2_ESM.tif
Fig. S2 Phenolic release of infected immature embryos on co-cultivation medium. a Filter paper treatment. b No filter paper treatments (TIFF 352 kb)
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Do, P.T., Lee, H., Mookkan, M. et al. Rapid and efficient Agrobacterium-mediated transformation of sorghum (Sorghum bicolor) employing standard binary vectors and bar gene as a selectable marker. Plant Cell Rep 35, 2065–2076 (2016). https://doi.org/10.1007/s00299-016-2019-6
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DOI: https://doi.org/10.1007/s00299-016-2019-6