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Plant Cell Reports 1992-Mar

Genetic transformation of sweet potato by particle bombardment.

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C S Prakash
U Varadarajan

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概要

Transient and stable expression of foreign genes has been achieved in sweet potato using the particle bombardment system of gene delivery. Callus and root isolates of two genotypes (Jewel and TIS-70357) with positive signs of transformation have been recovered. Tungsten microcarriers coated with plasmid DNA (pBI 221 containing the gusA gene) were accelerated at high velocity using a biolistic device into sweet potato target tissues. Histochemical examination of bombarded leaf and petiole explants revealed that most had cells expressing the gusA gene. When explants were cultured, calli and roots developed in most bombarded tissues. Similar results but with a lower frequency of transformation were observed when the plasmid pBI 121 (with gusA and antibiotic resistance npt II genes) was employed and bombarded explants cultured on an antibiotic selection medium. Subcultured roots and calli were positive for gusA expression when tested even after one year of in vitro culture, and thus the expression of the foreign gene is fairly stable. The particle bombardment approach of gene delivery appears to have a potential for generating transgenic sweet potatoes with useful agronomic traits.

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