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Inhibition of photosynthesis by solar radiation in Dunaliella salina : relative efficiencies of UV‐B, UV‐A and PAR
Author(s) -
HERRMANN H.,
HÄDER D.P.,
GHETTI F.
Publication year - 1997
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1046/j.1365-3040.1997.d01-77.x
Subject(s) - photosynthesis , dunaliella salina , quantum yield , oxygen , photosynthetic efficiency , oxygen evolution , ultraviolet , radiation , botany , quantum efficiency , irradiation , chemistry , algae , biology , analytical chemistry (journal) , horticulture , physics , optics , environmental chemistry , fluorescence , electrochemistry , organic chemistry , electrode , nuclear physics
Inhibition of photosynthesis after exposure to solar radiation was investigated in the marine green alga Dunaliella salina by monitoring photosynthetic optimal quantum yield F v /F m and efficiency of oxygen production. Samples were exposed to solar radiation in Ancient Korinth, Greece (37°58′ N, 23°0′ E) in August 1994. Within 30 min, F v /F m and efficiency of oxygen production decreased with similar kinetics with increasing exposure time. The inhibition, however, diminished when ultraviolet radiation was progressively excluded by means of colour filter glasses. Samples exposed for 3 h showed complete or partial recovery of photosynthesis, with almost the same rate under all irradition conditions. The fit of the experimental data with an analytical model describing inhibition of photosynthesis as a function of a linear combination of the photon fluence in the UV‐B, UV‐A and PAR allows one to estimate the relative mean effectiveness for inhibition by the three spectral ranges [about 2 × 10 −4 , 4 × 10 −6 and 2 × 10 −7 (μmol photons m −2 ) −1 for UV‐B, UV‐A and PAR, respectively].