biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 38:53, 1996 | DOI: 10.1007/BF02879634

Damages of photosynthetic apparatus inAnacystis nidulans by ultraviolet-B radiation

N. Nedunchezhian1, A. Abadia1, J. Abadia1, K. C. Ravindran2, G. Kulandaivelu2
1 Department of Plant Nutrition, Aula Dei Experimental Station, Zaragoza, Spain
2 School of Biological Sciences, Madurai Kamaraj University, Madurai, India

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.

Keywords: light-harvesting complex; photosystem 2; phycobilisome

Received: April 10, 1995; Accepted: June 21, 1995; Published: March 1, 1996  Show citation

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Nedunchezhian, N., Abadia, A., Abadia, J., Ravindran, K.C., & Kulandaivelu, G. (1996). Damages of photosynthetic apparatus inAnacystis nidulans by ultraviolet-B radiation. Biologia plantarum, 38(1), 53. doi: 10.1007/BF02879634
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