Abstract
Stomatal resistance, transpiration rate, leaf area, and height were measured on Texas clones of eastern cottonwood (Populusdeltoides Bartr. var. deltoides) grown in pots of soil maintained under three watering regimes, to determine the effect of drought on plant-water relations and growth. Leaf area expansion stopped at a stomatal resistance between 28 and 32 s cm−1. Height growth stopped at a stomatal resistance between 30 and 40 s cm−1. Transpiration rate was controlled by stomatal resistance. Stomatal resistance measurements were an easy way to determine the threshold beyond which severe moisture stress resulted in leaf and height growth cessation and eventual plant death.
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