Photosynthetica, 2008 (vol. 46), issue 2

Photosynthetica 2008, 46(2):161 | DOI: 10.1007/s11099-008-0027-7

Duration of irradiation rather than quantity and frequency of high irradiance inhibits photosynthetic processes in the lichen Lasallia pustulata

M. Barták1, H. Vráblíková-Cempírková1,*, J. Štepigová1, J. Hájek1, P. Váczi1, K. Večeřová1
1 Department of Plant Physiology & Anatomy, Institute of Experimental Biology, Masaryk University, Brno, Czech Republic

Lichen thalli were exposed to 4 regimes differing in irradiance and duration of irradiation. Photosynthetic efficiency of thalli was monitored by chlorophyll fluorescence parameters and xanthophyll cycle analysis. Maximal quantum yield of photosystem 2 (FV/FM) decreased gradually with time in long-term treatment. The effect of additional short-term high irradiance (HI) treatment applied each 24 h was not significant. Nevertheless, short-term HI applied repeatedly on thalli kept in the dark led to a significant decrease of FV/FM. Non-photochemical quenching recorded during the long-term treatment corresponded to the content of zeaxanthin (Z). In short-term treatment, however, proportion of Z (and antheraxanthin) to total amount of xanthophyll cycle pigments recovered to the initial values every 24 h after each repeated short-term HI event in thalli kept in dark. Thus duration of irradiation rather than irradiance and frequency of HI events is important for a decrease in primary photosynthetic processes in wet thalli of Lasallia pustulata. Rapidly responding photoprotective mechanisms, such as conversion of xanthophyll cycle pigments, are involved mainly in short-term irradiation events, even at HI.

Keywords: chlorophyll fluorescence; non-photochemical quenching; photoinhibition; photochemical quenching; xanthophyll cycle; zeaxanthin

Received: June 14, 2007; Accepted: November 8, 2007; Published: June 1, 2008Show citation

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Barták, M., Vráblíková-Cempírková, H., Štepigová, J., Hájek, J., Váczi, P., & Večeřová, K. (2008). Duration of irradiation rather than quantity and frequency of high irradiance inhibits photosynthetic processes in the lichen Lasallia pustulata. Photosynthetica, 46(2), 161. doi: 10.1007/s11099-008-0027-7.
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