Inhibition of Chlorophyll Synthesis by High Concentrations of Carbon Dioxide

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Abstract
In the presence of 20% oxygen, concentrations of carbon dioxide of 10% and above inhibited the production of chlorophyll in etiolated leaves of barley variety Pioneer, wheat variety Ca-pelle, oat variety Blenda, and dwarf French bean variety Black Valentine during continous illumination. On return to air, recovery from this inhibition took place rapidly. High concentrations of carbon dioxide inhibited chlorophyll production when illumination was discontinuous (2-m-second flash separated by 3-minute dark period) during which photosynthetic activity was judged to be negligible. The inhibition was alleviated by feeding with [delta]-amino levulinic acid, implying that the site of inhibition was early in the sequence of chlorophyll synthesis.