Photosynthetica 2009, 47(1):104-111 | DOI: 10.1007/s11099-009-0016-5

Excitation kinetics during induction of chlorophyll a fluorescence

A. Barócsi1,*, S. Lenk1, L. Kocsányi1, C. Buschmann2
1 Department of Atomic Physics, Budapest University of Technology and Economics, Budapest, Hungary
2 Botanical Institute, University of Karlsruhe, Karlsruhe, Germany

We present a chlorophyll fluorometer module system which adapts the intensity to the individual leaf sample by adjusting the quantum flux density of the excitation light so that the fluorescence signal is kept constant. This is achieved by means of a feedback power adjustment of the fluorescence exciting laser diode. Thus, the intensity of the excitation light is adapted to the actual need of a particular sample for quantum conversion without applying exaggeratedly high quantum flux density. We demonstrate the influence of the initial laser power chosen at the onset of irradiation and kept constant during fluorescence rise transient within the first second. Examples are shown for measuring upper and lower leaf sides, a single leaf with different pre-darkening periods, as well as yellow, light green and dark green leaves. The novel excitation kinetics during the induction of chlorophyll fluorescence can be used to study the yield and regulation of photosynthesis and its related non-photochemical processes for an individual leaf. It allows not only to sense the present state of pre-darkening or pre-irradiation but also the light environment the leaf has experienced during its growth and development. Thus, the individual physiological capacity and plasticity of each leaf sample can be sensed being of high importance for basic and applied ecophysiological research which makes this new methodology both innovative and informative.

Additional key words: chlorophyll fluorescence; chlorophyll fluorometer module system; induction kinetics; irradiation; Kautsky effect; light adaptation

Received: June 17, 2008; Accepted: November 15, 2008; Published: March 1, 2009  Show citation

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Barócsi, A., Lenk, S., Kocsányi, L., & Buschmann, C. (2009). Excitation kinetics during induction of chlorophyll a fluorescence. Photosynthetica, 47(1), 104-111. doi: 10.1007/s11099-009-0016-5
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