world and cause an increased production of reactive oxygen species (ROS), followed by
activation of a complex antioxidant system. In this study, the superoxide dismutase (SOD)
enzymatic activity and the gene expression levels of eight isoforms of SOD were evaluated
in drought-tolerant and drought-sensitive varieties of upland rice,'Oryza sativa'japonica (the
Primavera and Douradão cultivars), including shoot and root tissues in two stages of plant …