The response of clones of Populus tremuloides differing in sensitivity to ozone in the field

acide ascorbique acido ascorbico air pollution antioxidantes antioxidants antioxydant ascorbic acid avejentamiento estoma feuille glutathion glutathione glutation hojas leaf area leaves metabolism metabolisme metabolismo ozone ozono photosynthese photosynthesis populus tremuloides senescence stomata stomatal resistance stomate superficie foliar surface foliaire