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Carbon Dioxide Exchange in Compact and Semi-Open Sorghum Inflorescences¹

Carbon dioxide exchange rates were monitored in light and dark in compact and semi-open heads of sorghum (Sorghum bicolor (L.) Moench). Developmental stages ranged frmn bloom to hard dough in the grain. Highest CO2 uptake in both head types occurred at the bloom stage when net uptake rates for semi-open and compact type heads were 3.9 and 1.2 mg CO₂ g dry wt^-1 hr^-1, respectively. Beginning at the ,milk stage, a net CO₂ evolution on the order of 1 to 1.4 mg g dry wt^-1 hr^-1 occurred in compact heads in the light. The semi-open head type continued a small net CO₂ uptake in the light through the milk and soft dough stages. Both head types evolved CO₂ at hard dough stage. Dark respiration was similar in both head types and decreased from about 4 to 1 mg CO₂ g dry wt^-1 hr^-1 from bloom to hard dough.

Key Words: Photosynthesis • Respiration • Inflorescence

² Plant Physiologist, Crops Research Division, ARS, USDA and Assoc. Prof., Dept. of Agronomy, University of Nebraska, Lincoln 68503; Assoc. Prof., Dept. of Horticulture and Forestry, University of Nebraska.

Received for publication May 18, 1967.