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Biophysical Journal 12: 832-838 (1972)
© 1972 the Biophysical Society

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Photon Trapping in Photosystem II of Photosynthesis

The Fluorescence Rise Curve in the Presence of 3-(3,4-Dichlorophenyl)-1,1-dimethylurea

Wardella W. Doschek and Bessel Kok

ABSTRACT

Using isolated chloroplasts in the presence of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), an analysis was made of the rise of the fluorescence yield effected by weak light. Depending on the pretreatment, the time-course of the rapid photochemical part of the rise varied between nearly first-order and quadratic kinetics, i.e., reflected either a one-quantum or a two-quantum conversion. We consider the occurrence of two photoreductants per system II unit, which are reoxidized in different dark reactions. The data further showed that the "first-order process" is also inhomogeneous.






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Copyright © 1972 by the Biophysical Society.