Ozone-induced accelerated foliar senescence: implications for toxicity and compensation

Abstract

Two-year-old seedlings of black cherry, Prunus serotina Ehrh., northern red oak, Quercus rubra L. and sugar maple, Acer saccharum Marsh., and ramets of hybrid poplar, Populus maximowizii x trichocarpa, clone 245 were grown in eight charcoal-filtered open-top chambers per species. Half the chambers, per species, received 0.08 iL L^-1 O₃ from 1000 to 1800 h each day of the growing season. Accelerated foliar senescence and associated O_3- induced loss in Rubisco were observed in older foliage of hybrid poplar and black cherry. Younger leaves were less responsive to O₃ and in the case of hybrid poplar actually exhibited signs of compensation to the stress. Sugar maple and northern red oak were less responsive and exhibited no signs of accelerated senescence. The relevance of the latter response is considered in the context of the indeterminate and determinate growth habits of these two groups of plant species.

Parent Publication

• Proceedings, 1995 meeting of the Northern Global Change Program; 1995 March 14-16; Pittsburgh, PA. : Introduction/Environmental Change

Citation

Pell, Eva J.; Brendley, Bryan W.; Sinn, Judith P. 1996. Ozone-induced accelerated foliar senescence: implications for toxicity and compensation. In: Hom, John; Birdsey, Richard; O''Brian, Kelly, eds. Proceedings 1995 meeting of the northern global change program; Gen. Tech. Rep. NE-214. Radnor, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station: 13-19.