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Stomatal Resistance to Transpiration in Three Contrasting Canopies¹

Profiles of stomatal resistance in canopies of corn (Zea mays L.), yellow-poplar (Liriodendron tulipifera L.) and flowering dogwood (Comus florida L.) showed increased resistances in the lower portion of the canopy. In corn, this increase was partly the result of reduced illumination and partly the result of senescence. The age of the leaf did not affect its resistance prior to turning yellow. In the woodland species, the stomata closed at lower illumination than in corn, and illumination was the major factor determining the increase of the stomatal resistance within the tree canopics.

Key Words: Illumination • Leaf age • Senescence • Corn • Yellow-poplar • Flowering dogwood

² Assistant Crop Physiologist.

Received for publication September 6, 1968.