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Carbon Dioxide Exchange in Water-stressed Sorghum¹

Carbon dioxide exchange was monitored in potted RS 610 sorghum [Sorghum bicolor (L.) Moench] in a growth chamber as it dried out from a freshly watered condition to severe water stress. Carbon dioxide uptake in the light decreased to near the compensation point at water potentials near _*25 atmospheres. Leaf resistance to gaseous exchange was high at this point. Evolution of CO₂ in the light occurred as stress became greater. Dark evolution of CO₂ was higher at water potentials near _*20 atmospheres than in either the more severely stressed or non-stressed condition. The activity of phosphoenolpyruvic carboxylase remained comparatively high as water stress increased.

Key Words: CO₂ exchange • Photosynthesis • Respiration • Leaf resistance • Phosphoenolpyruvic carboxylase

² Formerly Research Assistant at the University of Nebraska; (now Instructor at Michigan State University, East Lansing, Michigan) Associate Professor, Agronomy Department, University of Nebraska; and Associate Professors, Horticulture Department, University of Nebraska 68503.

³ Financial support for this work was given by the Nebraska Water Resources Research Institute, The Rockefeller Foundation, and the U. S. Department of Agriculture.

Received for publication November 27, 1970.

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