We evaluated the impact of acute ozone (O 3 ) on photosynthesis of energy cane and sugarcane, hypothesizing that energy cane –known for its resilience to environmental disturbances– would exhibit higher tolerance to O 3 than sugarcane. Under growth chamber conditions, plants were exposed to three O 3 concentrations (0, 150, and 300 ppb) for three consecutive days. Leaf CO 2 assimilation declined in both crops after one day of...