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Leaf stomatal conductance was monitored with a steady-state porometer throughout growth and development of soybean and potato plants grown at 500, 1000, 5000, and 10,000 (potato only) μmol mol -1  carbon dioxide (CO 2 ). All plants were grown hydroponically with a 12-hr photoperiod and 300 μmol m -2  s -1  PPF. As expected, conductance at 1000 was &lt; 500 μmol mol -1  for both species, but conductance at 5000 and 10,000 μmol mol -1  was ≥ that at 500 μmol mol -1 . Subsequent short-term (24-hr) tests with potato and wheat plants grown at 1000 μmol mol -1  showed that raising CO 2  to approx. 10,000 μmol mol -1  or lowering CO 2  to 400 μmol mol -1  increased conductance compared to 1000 μmol mol -1  for potato, while only lowering CO 2  to 400 μmol mol -1  increased conductance for wheat. Furthermore, raising the CO 2  to 10,000 μmol mol -1  increased dark-period conductance in comparison to 1000 μmol mol -1  for potato, while dark-period conductance for wheat leaves was low regardless of the CO 2  concentration. Results suggest that very high CO 2  levels (e.g. 5000 to 10,000 μmol mol -1 ) may substantially increase water use of certain crops.

INCREASED LEAF STOMATAL CONDUCTANCE AT VERY HIGH CARBON DIOXIDE CONCENTRATIONS