Abstract
Changes in photosystem (PS) 2 activity were measured inAnacystis nidulans cells exposed to UV-B irradiation. The decrease in PS 2 activity was biphasic in cells exposed at the surface (0 cm) and at 2 cm depth in the water column, while gradual in those exposed at 10 and 30 cm depth. Addition of supplemental “white light” reduced the extent of UV-B damage. Decrease in photosynthetic activity was primarily due to the loss of energy transfer from phycobilisome to chlorophyll as the former in cyanobacteria acts as the primary light-harvesting complex. This was supported by the absorption and fluorescence excitation and emission spectral studies. All these changes were proportionally reduced by the thickness of the water column that reduced UV-B irradiance.
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Abbreviations
- BQ:
-
p-benzoquinone
- Chl:
-
chlorophyll
- PBS:
-
phycobilisoms
- PS 2:
-
photosystem 2
- UV-B:
-
ultraviolet-B (280 - 320 nm) radiation
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This work was supported in part by a grant from the Ministerio de Education y Ciencia (ref SB 94-AM086772) to N. N.
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Nedunchezhian, N., Abadia, A., Abadia, J. et al. Damages of photosynthetic apparatus inAnacystis nidulans by ultraviolet-B radiation. Biol Plant 38, 53–59 (1996). https://doi.org/10.1007/BF02879634
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DOI: https://doi.org/10.1007/BF02879634