Senescence can be delayed in transgenic plants over expressing the enzyme isopentenyl transferase (IPT) due to stress-induced increased levels of endogenous cytokinins. This trait leads to sustained photosynthetic activity and improved tolerance to abiotic stress. The aim of this study was to generate and characterize transgenic plants of maize (Zea mays L.) transformed with the IPT gene sequence under the regulation of SARK promoter (protein kinase receptor-associated senescence). Three independent transgenic events and their segregating null controls From 5 bombardment experiments, 26 calli were obtained with differential growth in selective medium. The presence of the IPT trans gene was confirmed in 19 of them by PCR. Fertile T0 transgenic plants were obtained and crossed with inbred BLS14 (pollinator) in order to ensure the descent of transgenic plants. The two subsequent generations were obtained by back crossing (BC1 and BC2), always in a biosafety greenhouse. BC1 seeds from 10 SARK:IPT events were obtained, and the BC2 generation advanced from BC1 plants of the events SI2, SI6 and SI4