Abstract
The CO2 compensation concentration (Γ) in Moricandia arvensis (L.) DC. (Cruciferae) was determined from leaves at different insertion levels and at different O2 concentrations. At 21% O2 the highest values of Γ were found in leaves from the top of the plant. These values (> 40 vpm) are comparable with those of C3-plants. Significantly lower values (20 vpm and lower) were obtained in leaves of a middle insertion level and somewhat higher values in the oldest leaves. Dark respiration was highest in the leaves from the top and decreased permanently with decreasing insertion level. Below 15% O2 the response of Γ to O2 concentration was nonlinear. Above 15% O2 a linear relationship between Γ and O2 content was observed. The slope of this linear part of the O2 response curve was smaller than in C3 plants. The leaves do not possess a typical Kranz anatomy.
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