In most sugarcane varieties, elevated carbon dioxide alone does not affect photosynthesis, but the combination of elevated carbon dioxide and elevated temperature decreased photosynthesis. Elevated carbon dioxide decreases stomatal conductance and transpiration while increasing transpiration efficiency. The variable responses to elevated temperature and the significant genotypic variation to elevated carbon dioxide and elevated temperature observed, both individually and together, demonstrate a considerable scope to breed sugarcane varieties for a future high carbon dioxide and warmer climate. (Read more ...)