Photosynthetica 2009, 47(3):388 | DOI: 10.1007/s11099-009-0060-1

Blue radiation stimulates photosynthetic induction in Fagus sylvatica L.

M. Ko¹vancová-Zitová1,2, O. Urban1,*, M. Navrátil3, V. ©punda3, T. M. Robson4, M. V. Marek1,2
1 Laboratory of Plants Ecological Physiology, Division of Ecosystem Processes, Institute of Systems Biology and Ecology, Brno, Czech Republic
2 Department of Forest Ecology, Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry in Brno, Brno, Czech Republic
3 Department of Physics, Faculty of Science, Ostrava University, Ostrava 1, Czech Republic
4 Instituto Nacional de Investigaciones Agrarias y Tecnologías Agroalimentarias, Centro de Investigación Forestal, Madrid, Spain

This study was designed to test the hypothesis that the spectral composition of incident radiation, as defined by the relative proportions of blue (B; λmax = 455 nm) and red (R; λmax = 625 nm) photons, can affect photosynthetic induction, since B photons stimulate stomatal opening and are more effectively absorbed by leaves than R photons. Different stages of photosynthetic induction, primarily determined by the photo-modulation of Rubisco activity and stomata opening, were investigated in dark-adapted leaves of Fagus sylvatica transferred to saturating irradiance [800µmol(photon) m-2 s-1] at B/R ratios of 1/3, 1/1, or 3/1.
In agreement with our hypothesis, photosynthesis was induced faster by irradiance with a high B/R ratio (3/1); as demontrated by a higher IS60 (induction state 60 s after leaf illumination) and lower T 90 (the time period required to reach 90 % of maximum steady-state photosynthesis). However, there were no differences in induction between leaves receiving equal (1/1) and low (1/3) B/R ratios. Electron transport was highly sensitive to radiation quality, exhibiting faster induction kinetics with increasing B/R ratio. Such stimulation of carbon-assimilatory processes corresponds with faster activation of Rubisco and lower non-photochemical quenching (NPQ) as the proportion of B photons is increased. In contrast, the kinetics of stomatal opening was independent of the spectral composition of incoming radiation. Since slightly higher absorption efficiency of high B/R radiation does not fully explain the changes in induction kinetics, the other possible mechanisms contributing to the stimulation of electron transport and Rubisco activity are discussed.

Additional key words: blue, red ratio; electron transport; non-photochemical quenching; radiation quality; Rubisco activation; transient limitations of photosynthesis

Received: June 11, 2009; Accepted: August 26, 2009; Published: September 1, 2009  Show citation

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Ko¹vancová-Zitová, M., Urban, O., Navrátil, M., ©punda, V., Robson, T.M., & Marek, M.V. (2009). Blue radiation stimulates photosynthetic induction in Fagus sylvatica L. Photosynthetica, 47(3), 388. doi: 10.1007/s11099-009-0060-1
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