Abstract
Relatively low concentrations of Pb, Cd, Ni, and Tl inhibit photosynthesis and transpiration of detached sunflower leaves ( Helianthus annuus L.). The primary mode of action is the interference with stomatal function. Photosynthesis is reduced by 50% of maximum when left tissue concentrations in mM · g −1 are 0·31 (63 ppm) Tl, 0·85 (96 ppm) Cd, 0·93 (193 ppm) Pb, or 1·35 (79 ppm) Ni.
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