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Corn is a crop of great economic importance in the Brazilian and world agriculture. The water supply is important for their growth and development from that adopted in the proper amount to meet the water needs of the plant. This study aimed to evaluate the physiological and biochemical response of a cultivar of transgenic corn and a hybrid subjected to different irrigation. The work was conducted in greenhouse on campus Unoeste II, Presidente Prudente - SP. The experimental design was in randomized blocks in a double factorial design with five depth of irrigation (150, 100, 75, 50 and 25% crop evapotranspiration (ETc)), two cultivars (transgenic Agroceres 8088 and robust 22 PEN (Selegrãos)) and 4 blocks. The depths of irrigation were determined according to the daily readings evaporimeter tar adjusted by the crop coefficient (kc) of 1.2 for the corn crop. The parameters evaluated were plant height, length and root volume, dry weight of shoot and root, root / shoot ratio and shoot proline concentration in fresh leaves. Data were submitted to ANOVA and then Tukey test to compare means between the probability level of 0.05. For the conditions of Oeste Paulista, is more feasible planting cultivar of PEN 22 Robust irrigation with 25% of crop evapotranspiration (ETc) for ensuring biomass accumulation in the vegetative stage.