Elevated CO2 protects poplar (Populus trichocarpa × P. deltoides) from damage induced by O3 : identification of mechanisms

Functional Plant Biology : FPB
Simon D L GardnerGail Taylor

Abstract

CO2 concentrations in the Earth's atmosphere will rise to between 550 and 700 μL L-1 by 2100 (IPCC 2001). In much of the world, ozone (O3) is the air pollutant most likely to be having adverse effects on the growth of plants. Here we describe the impacts of CO2 and O3 episodes (rising to 100 nL L-1), singly and in mixtures on the growth and physiology of an interamerican hybrid poplar (Populus trichocarpa L. (Torr. & Gray ex Hook.) × P. deltoids Bartr. ex Marsh). 700 μL L-1 CO2 increased all growth variables relative to values in 350 μL L-1. Mainstem dry weight showed a 38% increase in year 1 and a 32% increase in year 2. Ozone episodes reduced mainstem dry mass by 45% in 350 μL L-1 CO2 and by 34% in 700 μL L-1 CO2. A / Ci analysis showed limited effects on photosynthetic efficiency of 700 μL L-1 CO2 but in contrast, Vcmax was reduced by O3 episodes. CO2 tended to increase leaf expansion but O3 episodes reduced expansion rates generally although a short period of increased leaf expansion in response to O3 was also observed. O3 reduced leaf solute potentials (Ψs) and increased turgor (P) in young leaves. Cell wall properties (elasticity and plasticity) were both stimulated by ozone and this was associated with increased leaf exp...Continue Reading

References

Jan 1, 1997·Environmental Management·W E HOGSETTJ A LAURENCE
Jul 17, 2003·Tree Physiology·C CalfapietraG Scarascia-Mugnozza
Jan 1, 1997·Environmental Pollution·J FuhrerM R Ashmore
Feb 10, 1989·Science·S H Schneider
Jan 1, 1987·Trends in Ecology & Evolution·B R Strain
Jan 1, 2001·Plant Disease·Sagar KrupaBarbara A Zilinskas
Sep 1, 1995·The New Phytologist·Simon D L GardnerCreana Bosac

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