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Changes in chlorophyll fluorescence during exposure of Dunaliella tertiolecta to UV radiation indicate a dynamic interaction between damage and repair processes
Authors:Heraud  Philip  Beardall  John
Affiliation:(1) Department of Biological Sciences, Monash University, Clayton, Victoria, 3168, Australia;(2) Present address: Department of Chemistry, Monash University, Clayton, Victoria, 3168, Australia
Abstract:
Photosynthesis in the green alga Dunaliella tertiolecta, as measured by chlorophyll fluorescence, is inhibited by ultraviolet radiation and specifically, under the conditions used, by UVB radiation (UVBR). The decline in the fluorescence parameters Fv/Fm and ΔF/Fm' under constant UVBR is a first-order function of time of exposure. The data are well-described by the Kok (1956) model, which assumes a dynamic interaction between damage and repair, with repair being proportional to the pool size of inactivated targets. The pattern of photoinhibition is also consistent with the Kok model, in that it shows an initial, approximately linear phase which is time-dependent (reciprocity holds), a transition phase and then an asymptotic phase, representing an equilibrium between damage and repair, which is determined by UVBR fluence rate (reciprocity fails). Photoinhibition in the presence of lincomycin, a protein synthesis inhibitor, is consistent with the cessation of repair processes and, under these conditions, photoinhibition is proportional to exposure time. This revised version was published online in June 2006 with corrections to the Cover Date.
Keywords:Dunaliella tertiolecta   fluorescence  microalgae  PS II  UVR
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