Plasmid DNA pB1221 harboring beta-glucuronidase gene was delivered to synchronized cultured tobacco (Nicotiana tabacum L. cv Bright Yellow-2) cells of different cell cycle stages by a pneumatic particle gun. The cells bombarded at M and G(2) phases gave 4 to 6 times higher transformation efficiency than those bombarded at the S and G(1) phases.
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Iida et al. (1991) studied this question.
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