Annals of Botany

Avoidance of ozone-induced stress via stomatal closure

Avoidance of ozone-induced stress via stomatal closure
Avoidance of ozone-induced stress via stomatal closure

Stomatal closure can be caused by an increase in internal CO2 concentration resulting from ozone-induced inhibition of carbon assimilation by chloroplasts; however, if stomata can close as a direct response to O3 then such inhibition could be avoided. Hoshika et al. modify a coupled photosynthesis–stomatal model to test this hypothesis in Siebold’s beech (Fagus crenata) exposed to ambient and elevated O3 and find that O3-induced stomatal closure during early summer reduces influx and allows the maximum photosynthetic capacity to be reached. However, in late summer and autumn the decrease in stomatal conductance is small and accompanied by an ozone-induced decline of photosynthetic capacity.

Comments are closed.

%d bloggers like this: