Abstract

Summary A close relationship between intracellular chloroplast distribution and the pattern of intercellular spaces of the palisade mesophyll of the drought deciduous subshrub Ballota acetabulosa , a mediterranean plant common in phryganic formations of Greece, is described. As seen in tangential sections, chloroplasts of palisade cells are arranged along intercellular canals. This phenomenon is discussed in relation to the CO 2 supply of chloroplasts. Is is assumed that the reported spatial distribution of chloroplasts increases the photosynthetic efficiency of the tissue and can be considered as an adaptive character.

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