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Updated: Aug 8, 2026

Relating Stomatal Conductance to Leaf Functional Traits
Published on: October 12, 2015
Water Relations of Cotton Plants under Nitrogen Deficiency: II. Environmental Interactions on Stomata
1United States Department of Agriculture, Science and Education Administration, Western Cotton Research Laboratory, Phoenix, Arizona 85040.
Abstract:
Nitrogen deficiency in cotton plants (Gossypium hirsutum L.) considerably increased the sensitivity of stomata to water stress. At air temperatures of 27, 35, and >/=40 C, threshold potentials for complete stomatal closure were -10, -15, and -26 bars in N-deficient plants and -20, -20, and -30 bars in high-N plants, respectively. This three-way interaction among N supply, water potential, and air temperature was similar to that exerted on leaf expansion. The effects of N supply on stomatal behavior could not be explained on the basis of either osmotic or structural considerations. Rather, effects of N deficiency on mesophyll and stomata were independent and divergent. Stomatal behavior may impart a stress avoidance type of drought resistance to N-deficient plants.
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