Light, chlorophyll, carboxylase activity and CO fixation at various depths in the chlorenchyma of Opuntia ficus-indica (L.) Miller under current and elevated CO.

Mature cladodes of Opuntia ficus-indica (L.) Miller have a thick chlorenchyma (about 4 mm) with a relatively high chlorophyll convent (0.65 gm ), suggesting that light may be greatly attenuated and hence CO fixation negligible in the inner part of this tissue.