Changes in xanthophyll-cycle components and in fluorescence yield in leaves of a crassulacean-acid-metabolism plant,Clusia rosea Jacq., throughout a 12-hour photoperiod of constant irradiance
(1) Lehrstuhl Botanik II, Universität Würzburg, Mittlerer Dallenbergweg 64, D-8700 Würzburg, Germany;(2) Centro de Investigaciones en Ecologia y Zonas Aridas, Universidad Francisco de Miranda, P.O. Box 7506, Coro, Falcon, Venezuela