Dear Fardad

Usually there is a equilibrium between CO2 concentration inside stomatal cavity (Ci) and its concentration in atmosphere surrounding the leaf. In normal situation the Ci is usually less than CO2 concentration in ambient environment, as a result the stomata are open to provide the path for compensation of decreased Ci. However in the situation of high CO2 concentration and/or decreased use of Ci by photosynthesis, there is no need for CO2 for photosynthesis (due to high Ci), this situation usually persuade stomata to close. According to some literature ambient CO2 concentration not only determine the response of stomata but also it can determine the pattern and stomatal density on the leaf surface.

The best

Sasan

Stomata are the seat of gas exchange (O2, CO2) and transpiration, their movement depend mainly on environment around the crop or plant if there is any abiotic stress or no, such as drought, heat stress….etc. for that, there is always equilibrium (Ci / Ca) between CO2 concentration in the leaf intracellular (Ci) to that in the atmosphere ( Ca), also the ratio (Ci / Ca)differ among plants because of variation of supply rate of CO2 that releated to the chloroplaste demand for CO2 of the model linked with photosynthesis type (plant C3, C4 and CAM). On the other hand, the atmosphere is composed of 1.1 % 13C heavy (isotope) and 98.9% 12C light carbon and when the photosynthesis occur stomata will be the first barrier to discriminate between heavier and lighter carbon.

Bachiri Hamid

Dear Fardad,

We discus it a bit in attached article. Yes definitely stomata respond to Ci, however, as far as I know, the physiological mechanism is not known

Kind regards,

Mathias

Stomata respond to Ci, atmospheric CO2 and vapor pressure deficit. In the attached article you will find some signaling mechanisms mediated by H2O2 and other metabolites.