Photosynthetica 2006, 44(2):215-220 | DOI: 10.1007/s11099-006-0009-6

Photosynthesis and growth response of Calamagrostis arundinacea and C. villosa to enhanced UV-B radiation

O. Urban1,*, I. Tůma2, P. Holub2, M. V. Marek1
1 Institute of Systems Biology and Ecology, Academy of Sciences of the Czech Republic, Laboratory of Plant Ecological Physiology, Brno, Czech Republic
2 Institute of Botany, Academy of Sciences of the Czech Republic, Department of Ecology, Brno, Czech Republic

Calamagrostis arundinacea L. (Roth.) and C. villosa (Chaix.) J.F. Gmel are two grass species substituting forest communities on deforested areas in Central Europe. They were exposed to enhanced ultraviolet-B (UV-B, λ = 290-320 nm) radiation during 22 weeks. A system of modulated lamps operating under field conditions was used to simulate a 25 % increase of incident UV-B radiation. CO2 assimilation seemed to be limited by a decrease of stomatal conductance (g s) in C. arundinacea, whereas carboxylation activity of ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO) was not affected. On the contrary, g s and RuBPCO activity decreased in C. villosa. These physiological adjustments resulted in growth changes; above-ground biomass decreased in C. villosa (prevailing negative effect) and significantly increased in C. arundinacea (prevailing positive effect) in response to enhanced UV-B radiation.

Additional key words: biomass; field experiment; stomatal conductance; ultraviolet radiation

Received: August 5, 2005; Accepted: December 12, 2005; Published: June 1, 2006  Show citation

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Urban, O., Tůma, I., Holub, P., & Marek, M.V. (2006). Photosynthesis and growth response of Calamagrostis arundinacea and C. villosa to enhanced UV-B radiation. Photosynthetica44(2), 215-220. doi: 10.1007/s11099-006-0009-6
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