A complete randomized design was used. Two harvests were carried out (6 plants per genotype), before water restriction was initiated. After that, four harvests of 5 plants per treatment per genotype were carried out. The final harvest occurred when 50% of plants in each irrigation treatment reached senescence onset, defined as the stage when 50% of the upper leaves presented yellowing (stage code 600 of Jefferies and Lawson, 1991).