Effects of ozone pollution on phosphorus absorption and distribution in different varieties of wheat

With the aid of the FreeAir Ozone Concentration Enrichment (O3-FACE) system, effects of elevated atmospheric ozone on the biomass of five varieties of wheat (Tritcium aestivum L.) and phosphorus (P) uptake and distribution in wheat plant were investigated in Yangtze River delta. The results showed that the 50% increasing ozone concentration differently influenced the biomass of root and shoot of all wheat. Ozone elevation significantly decreased the yield of yangmai 16, yannong 19 and jiaxing 002 by 13.2%-35.7%, but had no significantly effect on yield of yangmai 15 and yangfumai 2 Elevated ozone decreased P content of root and shoot of all wheat, however no significant difference in the grain was found. Ozone elevation decreased P accumulation in the root and grain, and promoted P turnover from root to shoot, which increased the proportion of P in the grain to all biomass. Elevated ozone decreased partial productivity of phosphorus of yangmai 16, yannong 19 and jiaxing 002 by 9.0- 23.8 kg/kg P2O5, and significantly decreased utilization efficiency of phosphorus of yangmai 16, yannong 19 and jiaxing 002 by 8.2%-20.2%; however, there was no significant effect on yangmai 15 and yangfumai 2. It is quite obvious that elevated ozone pollution has a potential risks to change the matter distribution of wheat and influence phosphorus turnover in soilplant system.