Chlorophyll fluorescence induction curves of isolated thylakoids were measured in the absence and in the presence of various concentrations of photosystem II-inhibiting herbicides. A mathematical program was applied to simulate the curves. Based on these simulated curves a new method is developed to determine the concentration effect (pI(50)) of the herbicides. The results of the new method correspond well with reported values in the literature. The method is very convenient and time-saving. (C) 2004 Elsevier Inc. All rights reserved.
- photosynthetic electron-transport
- resistant chenopodium-album
- a fluorescence induction
- chlorophyll fluorescence