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Mariya V. Khodakovskaya, Richard J. McAvoy*, Keming Luo, and Yi Li

The bacterial isopentenyl transferase (ipt) gene involved in cytokinin biosynthesis was fused with a promoter from the serine proteinase inhibiter (win3.12) gene of Populus x generosa and introduced into Nicotiana tabacum (cv. Havana). Transformants were confirmed by PCR reaction and Southern blot analysis, and then analyzed for phenotypic characteristics. RT-PCR analysis detected transcripts of the ipt gene following the wounding of win3.12:ipt transgenic plants. In win3.12: ipt transgenic plants, lateral shoot number and the diameter of lateral branches that developed following apical shoot removal increased relative to wild-type plants. However, the increase in cytokinin production following wounding appeared to be short lived. The potential utility of this construct in enhancing lateral branching in ornamental crops will be discussed.