The aim of this research was to investigate, in terms of instantaneous
effects at single leaf level, the photosynthesis and the related
leaf optical properties at different wavelengths, in two types of
rose leaves which differed in their pigment composition. For this
objective, the spectral dependence of photosynthetic efficiency was
studied under light-limited irradiance, on incident and absorbed
light basis, on young leaves (reddish colour) and middle age leaves
(green colour). Finally, it was studied what the consequences of
these measurements at the leaf level are for the whole canopy photosynthesis.
This up-scaling of leaf scale processes to the canopy
level was achieved with a dynamic simulation model.