Abstract
Variations in the ploidy level of 69 transgenic potato (Solanum tuberosum L.) plants regenerated from the tuber discs of 17 diploid lines were studied: 24 plants (35%) were diploid, the other 45 plants (65%) were tetraploid. Seventy-eight control regenerants obtained without Agrobacterium inoculation showed a relatively low tendency to tetraploidization (35%). The results obtained suggested that chromosome doubling occurred frequently in diploid potato lines during the tissue culture process for regeneration. Putative somaclonal changes in in vitro-formed tuber proteins were detected in three out of six transformants by electrophoretic analysis.
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