Photochemical efficiency of photosystem II, photon yield of O2 evolution, photosynthetic capacity, and carotenoid composition during midday depression of net CO2 uptake in Arbutus unedo growing in Portugal. - Demmig-Adams,B..; Adams,W..W..; Winter,K..; Meyer,A..; Schreiber,U..; Pereira,J..S..; Krüger,A..; Czygan,F.-C..; Lange,O..L.. (Planta, 1989)