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Sorption of Ozone and Sulfur Dioxide by Petunia Leaves¹

ABSTRACT

Shoots of three cultivars of Petunia hybrida Vilm. of differing ozone (O₃) and sulphur dioxide (SO₂) sensitivity were exposed to O₃ and SO₂ in closed chambers for observation of pollutant absorption through the stomates and adsorption by leaf surfaces. The cultivar least sensitive to injury, ‘Capri’, absorbed the least ozone or SO₂ but adsorbed the most. The sensitive ‘White Cascade’ had the opposite sorption pattern. Absorption of the individual gases was generally less from the mixture, whereas adsorption rates were similar whether the gases were supplied singly or in mixture. The existence of substantial differences in surface adsorption could introduce error in measurements of pollutant absorption by leaves.

Key Words: air pollution • absorption • adsorption • cuticle • stomates • Petunia hybrida Vilm.

¹ Contribution of the Dep. of Hortic. Sci., Univ. of Guelph, Guelph, Ontario, Canada, N1G 2W1.

² Postdoctoral Fellow and Professor, respectively.

Received for publication March 12, 1979.