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Endogenous CO2 concentration and pericarp diffusion resistance to CO2 in sweet pepper fruits

Marian Czarnowski

The Franciszek Górski Department of Plant Physiology
Polish Academy of Sciences
Sławkowska 17, 31-016 Kraków, Poland

On the basis of measurements (in a closed system of an infrared gas analyser) of compensative CO2 concentration in the atmospheric surrounding the examined sweet pepper fruits in the assimilation chamber, it was demonstrated that the state of stability with endogenous CO2 concentration in darkness was about 3000 μmol CO2 mol-1 of air in yound and about 2700 μmol CO2 mol-1 in mature large green fruits. During irradiance of 800 μmol m-1 s-1 in small fruits it attained about 2700 μmol CO2 mol-1 and in larger ones about 2600 μmol CO2 mol-1. During irradiation in the nitrogen atmosphere the compensative CO2 concentration reached a level of only 1100 μmol CO2 mol-1. However, when the source of irradiation was switched off, it rose to reach the value 2700 μmol CO2 mol-1. Diffusion resistance to CO2 of the pericarp was 14 s cm-1 in small and 30 s cm-1 in large green sweet pepper fruits. Even under the optimal irradiation, the CO2 diffusion always proceeded from the fruits to the environment.

Czarnowski M., 1994. Endogenous CO2 concentration and pericarp diffusion resistance to CO2 in sweet pepper fruits. Folia Horticulturae VI/1: 31-39.