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Carbon Dioxide Compensation in Grasses¹

Carbon dioxide compensation concentrations were measured for 325 species of Gramineae. Compensation points of most species of the sub-family Festucoiaeae were 40 ppm CO₂ or greater at 25 C. Exceptions to this were found in the eight genera examined of the Chlorideae tribe of the Festucoideae as well as in the genera Anthephora, Eragrostis, Vaseyochloa and Pappophorum of other tribes, all of which had low compensation concentrations. Compensation concentrations of most species of the sub-family Panicoideae were 10 ppm CO₂ or less. Exceptions to this were found in the genus Panlcum, where species of the subgenus Dichanthelium had high compensation concentrations, while members of the subgenera Eupanicum and Paurochaetium had low compensation concentrations. Interspecific crosses between high and low compensating Panicum species may be possible and, if so, would permit study of the interdependence of photorespiration, photosynthetic carbon pathway, leaf anatomy and capacity for high rates of photosynthesis.

Key Words: Leaf anatomy • Grass systematics

² Graduate Assistant and Professor, Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul 55101.

Received for publication March 12, 1969.