Elevated CO protects poplar (Populus trichocarpa × P. deltoides) from damage induced by O: identification of mechanisms.

CO concentrations in the Earth's atmosphere will rise to between 550 and 700 μL L by 2100 (IPCC 2001). In much of the world, ozone (O) is the air pollutant most likely to be having adverse effects on the growth of plants. Here we describe the impacts of CO and O episodes (rising to 100 nL L), singly and in mixtures on the growth and physiology of an interamerican hybrid poplar (Populus trichocarpa L.