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Articles

A Synergistic Stimulation of Avena sativa Coleoptile Elongation by Indoleacetic Acid and Carbon Dioxide ¹

^a Department of Biological Sciences, Brock University, St. Catharines, Ontario, Canada

The ability of 0.03% CO₂ to stimulate growth has been investigated using etiolated Avena coleoptile sections maintained in buffered solution. This concentration of CO₂-stimulated growth after a lag period of 12 to 15 minutes, and a synergistic relationship between indoleacetic acid and CO₂ in stimulating growth has been demonstrated. The response to CO₂ is inhibited by cycloheximide and is lost approximately 10 minutes after exposure to CO₂-free air. Malate can replace CO₂ in stimulating growth. In the light of these data and recent literature on a growth response of coleoptile sections to CO₂-saturated solutions, the existence of two mechanisms of CO₂-simulated growth is proposed. In addition, it is suggested that growth promotion by 0.03% CO₂ is mediated by a process involving dark CO₂ fixation.

¹ This study was supported by a National Research Council of Canada grant to A.W.B. and a Colombo Plan Scholarship to T.A.