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American Chestnut [Castanea dentata (Marsh.) Borkh]. | LitMetric
The key to successful transformation of American chestnut is having the correct combination of explant tissue, selectable and scorable markers, and a reliable regeneration system. Rapidly dividing somatic embryos, growing as proembryogenic masses, are a suitable tissue; the bar gene is a suitable selectable marker in conjunction with 1.0 to 10 mg/L phosphirothricin (PPT); and the mgfp5-ER gene is an effective nondestructive scorable marker. We have also found that the more gently the somatic embryos are treated during the inoculation and co-cultivation steps, the higher the transformation efficiency. The average transformation efficiency that can be expected using the described protocol is approx 20 stable and embryogenic transformation events/g of somatic embryo tissue. Cell line and batch-to-batch deviations both upward and downward should be expected. Finally, somatic embryos can be induced to form shoots, which can then be micropropagated and acclimatized.
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