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Cytokinins have been shown to delay the onset of leaf senescence. The focus of this project was to produce transgenic petunia ( Petunia  × hybrida ) plants that over-produced endogenous cytokinins in a senescence specific manner. This was achieved by transforming plants with the  IPT  (isopentenyl transferase) gene driven by the senescence-associated transcriptional promoter, P SAG12 . Two independent transgenic events produced T 1  and T 2  generation seedling lines that demonstrated the desired nonsenescent phenotype in progeny trials. These lines were used to evaluate the horticultural performance of P SAG12 - IPT  petunia plants in terms of delayed senescence, rooting of vegetative cuttings, lateral branch growth, flower number, floral timing, and fruit set. Although both lines displayed a delayed senescence phenotype the two P SAG12 - IPT  transgenic lines differed from each other in regard to other horticultural traits. In addition to delayed leaf senescence, line I-1-7 also demonstrated a decrease in adventitious rooting and an increased number of branches during plant production. Line I-3-18 also demonstrated a delayed leaf senescence phenotype; however, plants of this line were not greatly altered in any other horticultural performance traits in comparison to wild-type `V26'.  IPT  transcript was detected in young fully expanded leaves of both lines, although mRNA levels were higher in I-1-7 plants. A greater than 50-fold increase in  IPT  transcript abundance was detected in leaves of transgenic plants following drought stress. These results demonstrate that it is possible to use P SAG12 - IPT  to produce transgenic plants with delayed leaf senescence but differences in plant morphology between transgenic lines exist, which may alter horticultural performance characteristics.

Drought-induced Leaf Senescence and Horticultural Performance of Transgenic PSAG12-IPT Petunias