Abstract
The CO2 compensation concentration (Γ) and leaf anatomy were determined in 107 species of six tribes of Brassicaceae. There was an abundant bundle-sheath in all investigated species. The Moricandia syndrome, characterized by a high concentration of chloroplasts in the bundle-sheath cells and Γ values < 30 cm3(CO2) m-3, was found within species of the genera Moricandia, Diplotaxis and Brassica. Available results from molecular systematics indicate a common phylogenetic ancestor, suggesting monophyletic evolution of the syndrome within the tribe Brassiceae. Nevertheless, Γ values of about 30 cm3 m-3 in some other genera of the tribes Brassiceae and Sisymbrieae indicate an evolutionarily sliding, gradual transition from C3 ancestors.
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