Tomato plant genetic transformation. Researcher placing a tomato leaf in a flask containing a bacterial culture. The bacteria have been genetically engineered to contain a plasmid, a circle of DNA (deoxyribonucleic acid). The plasmid contains a gene (iaaM) that prevents tomatoes from developing seeds. The bacteria will infect the plant cells, and the plasmid will become integrated into the tomato cells' genomes. The cells that have taken up the plasmid, or been transformed, will then be cultured and grown into tomato plants. Photographed at the University of Verona, Italy.
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