Photosynthetica, 2013 (vol. 51), issue 2

Photosynthetica 2013, 51(2):221-230 | DOI: 10.1007/s11099-013-0017-2

Excitation kinetics of chlorophyll fluorescence during light-induced greening and establishment of photosynthetic activity of barley seedlings

C. Buschmann1,*, S. Konanz1, M. Zhou1, S. Lenk2, L. Kocsányi2, A. Barócsi2
1 Botanical Institute, Karlsruhe Institute of Technology (KIT) University Sector, Karlsruhe, Germany
2 Department of Atomic Physics, Budapest University of Technology and Economics, Budapest, Hungary

Excitation kinetics based on feedback regulation of chlorophyll (Chl) fluorescence of leaves measured with the chlorophyll fluorometer, FluoroMeter Modul (FMM), are presented. These kinetics showed the variation of excitation light (laser power, LP) regulated by the feedback mechanism of the FMM, an intelligent Chl fluorometer with embedded computer, which maintains the fluorescence response constant during the 300-s transient between the dark- and lightadapted state of photosynthesis. The excitation kinetics exhibited a rise of LP with different time constants and fluctuations leading to a type of steady state. The variation of excitation kinetics were demonstrated using the example of primary leaves of etiolated barley seedlings (Hordeum vulgare L. cv. Barke) during 48 h of greening in the light with gradual accumulation of Chl and development of photosynthetic activity. The excitation kinetics showed a fast rise followed by a short plateau at ca. 30 s and finally a slow constant increase up to 300 s. Only in the case of 2 h of greening in the light, the curve reached a stable steady state after 75 s followed by a slight decline. The final LP value (at 300 s of illumination) increased up to 12 h of greening and decreased with longer greening times. The active feedback mechanism of the FMM adjusted the excitation light during the measurement to the actual photosynthetic capacity of the individual leaf sample. In this way, the illumination with excessive light was avoided. The novel excitation kinetics can be used to characterize health, stress, disease, and/or product quality of plant material.

Keywords: chlorophyll fluorescence; embedded system; induction kinetics; intelligent sensors; Kautsky effect; light adaptation

Received: May 23, 2012; Accepted: December 5, 2012; Published: June 1, 2013Show citation

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Buschmann, C., Konanz, S., Zhou, M., Lenk, S., Kocsányi, L., & Barócsi, A. (2013). Excitation kinetics of chlorophyll fluorescence during light-induced greening and establishment of photosynthetic activity of barley seedlings. Photosynthetica, 51(2), 221-230. doi: 10.1007/s11099-013-0017-2.
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