[Photosynthetic Characteristics and Ozone Dose-response Relationships for Different Genotypes of Poplar].

during daylight hours). Among the three genotypes of poplar, photosynthesis pigments contents in '546' significantly declined with the increase of ozone concentration but not in '90' and '84K'. According to the linear relationship of most photosynthetic parameters and AOT40, especially the total chlorophyll, '546' showed the maximum slope, follows by '90' and then '84K'. So the order of the ozone sensitivity of three poplar genotypes was '546'> '90'> '84K'. The results of this study can provide an important basis for breeding ozone resistant genotype of poplar as well as protecting poplar from ozone damage.