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The codon-modified  cryV-Bt  gene ( cryV-Bt ) from  Bacillus thuringiensis  subsp . kurstaki  Berliner, which is specifically toxic to Lepidoptera and Coleoptera insects, and a potato virus Y o  coat protein gene ( PVY o cp ), in which the aphid transmission site was inactivated, were cotransformed into potato ( Solanum tuberosum  L.) `Spunta' via  Agrobacterium tumefaciens  Conn. We demonstrated the integration and expression of both genes by molecular analysis and bioassays. All  cryV-Bt / PVY o cp -transgenic lines were more resistant to potato tuber moth ( Phthorimaea operculella  Zeller) and PVY o  infection than nontransgenic `Spunta'. Four  cryV-Bt / PVY o cp  transgenic lines were equal in potato tuber moth mortality to a  cryV-Bt  transgenic line, but of these four only two lines were equivalent in PVY o  titer levels to a  PVY o cp -transgenic line. We identified two transgenic lines, 6a-3 and 6a-5, which showed greater resistance to potato tuber moth and PVY o  than the other  cryV-Bt / PVY o cp  transgenic lines. This study indicated that multiple genes, conferring insect pest resistance and virus resistance, could be engineered into and expressed simultaneously in a potato cultivar.

Coexpression of Potato PVYo Coat Protein and cryV-Bt Genes in Potato