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Leaf Gas Exchange of Maize Plants Fumigated with Sulfur Dioxide

Istituto Chimica Agraria, Via S. Michele degli Scalzi, 2 56100 Pisa, Italy;
Dipartimento di Coltivazione e Difesa delle Specie Legnose, Sezione Patologia Vegetale, Via del Borghetto, 80 56100 Pisa, Italy.

ABSTRACT

Leaf gas exchange was measured in maize (Zea mays L.) plants that had been exposed continuously for a period of 4 wk to a range of SO₂ concentrations applied in fumigation chambers. Exposure to a constant SO₂ level of 43 and 71 nLL^–1 induced a decrease in the apparent photosynthesis and quantum yield, and an increase in the stomatal conductance and transpiration rate in comparison to the charcoal-air filtered controls. This would suggest that the reduction in photosynthesis observed was mainly due to nonstomatal components, i.e., the direct effect of SO₂ on the mesophyll.