A Transient Stimulation of Net Photosynthesis of Rye Leaves by α-Hydroxy-2-pyridinemethanesulphonic Acid (α-HPMS) due to Inhibition of Photorespiratory CO₂Release

Oscillations of the internal CO2 concentration in tobacco leaves transferred to low CO2

“…The PIB peak represents CO 2 release by photorespiratory glycine decarboxylation and it means that photoassimilation and photorespiration do not necessarily operate simultaneously. The idea that PIB is of photorespiratory origin is supported by the fact that this peak does not occur in leaves exposed to low (e.g., 2%) O 2 or to high CO 2 concentrations that inhibit the oxygenation reaction of Rubisco (Bulley and Tregunna, 1971;Doehlert et al, 1979;Łoboda et al, 1988;Atkin et al, 1998). The size of the PIB peak is increased under conditions of high glycolate production (low CO 2 , high light: Doehlert et al, 1979;Atkin et al, 1998).…”