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Endogenous CO2 concentration in tomato fruits

Marian Czarnowski, Włodzimierz Starzecki

Institute of Plant Physiology
Polish Academy of Sciences
Sławkowska 17, 31-016 Kraków, Poland

On the basis of compensative measurements of CO2 concentration in the atmosphere surrounding the examined tomato fruits it was demonstrated that, irrespective of their age, the state of stability with endogenous CO2 concentration in darkness was about 2900 cm3 CO2 m-3, whereas in light the endogenous CO2 concentration varies. In young fruits it attained 2050 cm3 CO2 m-3 in nitrogen atmosphere and 2300 cm3 CO2 m-3 in air. In large green fruits it rose to 2800 cm3 CO2 m-3, this being mainly connected with the decreasing rate of photosynthesis with the age of the fruit. Even in light, the CO2 diffusion always proceeded in one direction, i.e. from the fruits to the environment. Diffusion resistance to CO2 of the outer layer of the pericarp with the epidermis was 25 s cm-1 in small fruits and 75 s cm-1 in large green ones, while that of the parenchyma tissue varied from 0.6 to 2.1 s cm-1, irrespective of the age of the fruit.

Czarnowski M., Starzecki W., 1991. Endogenous CO2 concentration in tomato fruits. Folia Horticulturae III/2: 17-28.