Summary
Here we present a routine and efficient protocol for year-round production of fertile transgenic maize plants. Type II callus derived from maize Hi II immature zygotic embryos was transformed using the PDS 1000/He biolistic gun and selected on bialaphos. In an effort to improve the transformation protocol, the effects of gold particle size and callus morphology on transformation efficiency were investigated. Reducing gold particle size from 1.0 μm or 0.6 μm resulted in a significant increase in the rate of recovery of bialaphos-resistant clones from Type II callus. The average transformation efficiency of pre-embryogenic, early embryogenic and late embryogenic callus did not vary significantly. Rates of transformation, regeneration and fertility achieved for Type II callus are summarized and compared to those achieved for greenhouse- and field-derived immature zygotic embryos.
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Frame, B.R., Zhang, H., Cocciolone, S.M. et al. Production of transgenic maize from bombarded type II callus: Effect of gold particle size and callus morphology on transformation efficiency. In Vitro Cell.Dev.Biol.-Plant 36, 21–29 (2000). https://doi.org/10.1007/s11627-000-0007-5
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DOI: https://doi.org/10.1007/s11627-000-0007-5