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Photoinhibition was examined in four co-occurring Mediterranean evergreen tree species during two consecutive winters. In response to low temperatures and saturating light,  Juniperus phoenicea  L.,  Pinus halepensis  Mill.,  Quercus coccifera  L. and  Q. ilex  ssp.  ballota  (Desf.) Samp. exhibited marked chronic photoinhibition, indicated by low predawn maximal photochemical efficiency of photosystem II (PSII) ( F  v / F  m ). Low  F  v / F  m  values were correlated with high concentrations of xanthophyll cycle components (VAZ) and with the maintenance of high concentrations of zeaxanthin overnight (DPS pd ). In all species, however, chronic photoinhibition was enhanced as the winter progressed in the absence of changes in DPS pd , suggesting cumulative damage toward the end of winter.

Winter photoinhibition in the field involves different processes in four co-occurring Mediterranean tree species