Abstract
ABSTRACT Chloroplast movements provide a means for fine-tuning the absorption of radiation in leaves. Since evergreen sclerophylls may experience very different light levels during the seasons and at different locations either at the periphery or in the interior of a forest, such a mechanism must theoretically be of great importance for them. Detailed field and laboratory studies on sclerophylls are however lacking. We provide first evidence that chloroplasts in the leaf mesophyll of both Ilex aquifolium (holly) and Prunus laurocerasus (cherry laurel) may be stimulated by low light intensities. Even at winter temperatures close to freezing, chloroplasts move to a position where light absorption is increased. Effects of temperature, light pretreatment and light quality for the induction of movement are described.
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