Photosynthetica, 2008 (vol. 46), issue 2

Photosynthetica 2008, 46(2):286 | DOI: 10.1007/s11099-008-0050-8

Irradiance prior to and during desiccation improves the tolerance to excess irradiance in the desiccated state of the old forest lichen Lobaria pulmonaria

J. Štepigová1, Y. Gauslaa2, H. Cempírková-Vráblíková1, K. A. Solhaug2,*
1 Department of Plant Physiology and Anatomy, Institute of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
2 Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway

Hydrated thalli of the lichen Lobaria pulmonaria were either preconditioned to dim irradiance (DI, 5 µmol m-2 s-1) or medium irradiance (MI, 200 µmol m-2 s-1) for 6 h. After this 6 h period, the thalli were allowed to desiccate under the two respective irradiances. Thereafter, these dry lichens were exposed to high irradiance (HI, 1 000 µmol m-2 s-1) for 60 h. After this HI treatment, the maximal photochemical quantum yield (FV/FM) and the de-epoxidation state of xanthophyll cycle pigments (DEPS) were highest in thalli preconditioned to MI. Hence irradiance in the last hydrated period before sampling is significant for the physiological state of lichens. A standardized irradiance pre-treatment before start of experiments is recommended.

Keywords: chlorophyll fluorescence; photosynthetic quenching; photoinhibition; xanthophyll cycle

Received: May 25, 2007; Accepted: September 20, 2007; Published: June 1, 2008Show citation

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Štepigová, J., Gauslaa, Y., Cempírková-Vráblíková, H., & Solhaug, K.A. (2008). Irradiance prior to and during desiccation improves the tolerance to excess irradiance in the desiccated state of the old forest lichen Lobaria pulmonaria. Photosynthetica, 46(2), 286. doi: 10.1007/s11099-008-0050-8.
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