A simple indicator for non-destructive estimation of the violaxanthin cycle pigment content in leaves

Photosynthesis Research
Lars NichelmannWolfgang Bilger

Abstract

The photosynthetic apparatus of higher plants acclimates to irradiance. Among the features which are changing is the pool size of the pigments belonging to the violaxanthin cycle, in which zeaxanthin is formed. In high light grown leaves, the violaxanthin cycle pool size is up to five times larger than in low light. The changes are reversible on a time scale of several days. Since it has been published that violaxanthin cycle pigments do not transfer absorbed energy to chlorophyll, we hypothesized that excitation of chlorophyll fluorescence in the blue spectral region may be reduced in high light-acclimated leaves. Fluorescence excitation spectra of leaves of the Arabidopsis thaliana tt3 mutant showed strong differences between high and low light-acclimated plants from 430 to 520 nm. The resulting difference spectrum was similar to carotenoids but shifted by about 20 nm to higher wavelengths. A good correlation was observed between the fluorescence excitation ratio F 470/F 660 and the violaxanthin cycle pool size when leaves were acclimated to a range of irradiances. In parallel to the decline of F 470/F 660 with high light acclimation also the quantum yield of photosynthetic oxygen evolution in blue light decreased. The data c...Continue Reading

References

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Nov 20, 2014·The New Phytologist·Christopher Y S Wong, John A Gamon

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Citations

May 10, 2019·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Jana StelznerWolfgang Bilger
Jun 13, 2018·Royal Society Open Science·David DemoryOlivier Bernard

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