Photosynthetica, 2013 (vol. 51), issue 2

Photosynthetica 2013, 51(2):259-266 | DOI: 10.1007/s11099-013-0012-7

Photosynthetic performance of Anabaena variabilis PCC 7937 under simulated solar radiation

S. P. Singh1, R. P. Rastogi1,2, R. P. Sinha2,*, D. P. Häder1
1 Department of Biology, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany
2 Laboratory of Photobiology and Molecular Microbiology, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi, India

In vivo chlorophyll fluorescence analysis reflecting the photosystem II functionality was investigated in the cyanobacterium Anabaena variabilis PCC 7937 under simulated solar radiation in a combination with various cut-off filters (WG 280, WG 295, WG 305, WG 320, WG 335, WG 345, and GG 400) to assess the effects of photosynthetically active radiation (PAR), ultraviolet-A (UV-A), and ultraviolet-B (UV-B) radiations on photosynthesis. The photosynthetic activity (PA) was severely inhibited immediately after 10 min of exposure to high PAR, UV-A, and UV-B radiations compared with low PAR grown control samples. After 1 h of exposure, PA of 17.5 ± 2.9% was detected in the high PAR exposed samples compared with the control, while only a trace or no PA was observed in the presence of ultraviolet radiation (UVR). A recovery of PA was recorded after 2 h of the exposure, which continued for next 4, 8, 12, and 24 h. After 24 h of the exposure, PA of 57.5 ± 1.9%, 36.1 ± 11.7%, 23.5 ± 3.3%, 22.3 ± 5.2%, 20.8 ± 6.7%, 13.2 ± 6.6%, and 21.6 ± 9.5% was observed compared with the control sample in 400, 345, 335, 320, 305, 295, and 280 nm cut-off filters-covered samples, respectively. The relative electron transport rate, measured after 24 h exposure, showed also a disturbance in electron transfer between the two photosystems under the high PAR and UVR treatments relative to the control samples, suggesting the inhibition of photosynthesis. This study suggests that both high PAR and UVR inhibited the photosynthetic performance of A. variabilis PCC 7937 by damaging the photosynthetic apparatus, however, photoprotective mechanisms evolved by the organism allowed an immediate repair of ecologically important machinery, and enabled its survival.

Keywords: cut-off filters; cyanobacteria; effective quantum yield of PSII; pulse amplitude modulated fluorometer; ultraviolet-B radiation

Received: May 12, 2012; Accepted: November 26, 2012; Published: June 1, 2013Show citation

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Singh, S.P., Rastogi, R.P., Sinha, R.P., & Häder, D.P. (2013). Photosynthetic performance of Anabaena variabilis PCC 7937 under simulated solar radiation. Photosynthetica, 51(2), 259-266. doi: 10.1007/s11099-013-0012-7.
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