Use of rapid light curves to evaluate the plant photosynthetic performance
2002
Kovar, M. | Olsovska, K. | Brestic, M. (Slovak Agricultural Univ., Nitra (Slovak Republic))
In the experiment with barley plants (Hordeum vulgare L.; genotype Kompakt) variable photosythetic active radiation intensities (PPFD) and time exposition of individual PPFD in the course of photosynthetic light curve were evaluated. Two basic light curve procedures were used: rapid light curve (RLC; 10 and 30s intervals) and slow light curve (LC; 1, 3, 5 and 15 min intervals). Significant changes were observed in actual photochemical efficiency of PSII as well as in linear electron transport rate. These data were obrained by quenching analysis. It was found that the 3 min time interval of irradiation intensity is sufficient for evaluation of in situ behaviour of barley photosynthetic apparatus. In addition, this work gives a brief view into the action of photosynthetic apparatus on the level of electron trapping and optimal excitation energy use in stress conditions
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