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Photosynthesis, Diffusion Resistance and Relative Plant Water Content of Cotton as Influenced by Induced Water Stress¹

Frequent and simultaneous measurements of photosynthesis, transpiration, and relative plant water content were made on large cotton (Gossypium hirsutum L. ‘Empire’) plants. Measurements were made after adding polyethylene glycol to the nutrient solution to induce plant water stress. Reducing the solution water potential by 0.5, 1.0, and 2.0 bars had no observable effect upon the plant. The 4.0-bar treatment reduced photosynthesis, transpiration, and relative plant water content of a 97- day-old plant. The effect of the 4.0-bar treatment diminished as plant maturity increased and no residual effect of the treatment was detected after 48 hours of recovery in a standard nutrient solution.

Key Words: Transpiration • Polyethylene glycol • Plant water relationships

² Research Soil Scientist, USDA, Watkinsville, Georgia (Presently at Northern Great Plains Research Center, Mandan, North Dakota 58554).

Received for publication March 25, 1972.