Protection of Energy Transfer Process in Isolated Phycobilisome by "White Light" from Ultraviolet-B Induced Damage in the Cyanobacterium Spirulina Platensis |
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Authors: | S. Rajagopal Prasanna Mohanty S.D.S. Murthy |
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Affiliation: | (1) Department of Biochemistry, Sri Venkateswara University, Tirupati, 517 502, India;(2) School of Life Sciences, Jawaharlal Nehru University, New Delhi, 110 067, India |
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Abstract: | Effect of UV-B (1.9 W m-2) alone or in combination with supplemental "white light". WL (20 W m-2) exposure was studied on the energy transfer process of intact phycobilisomes isolated from Spirulina platensis. Exposure of UV-B or supplemental irradiation induced a decrease in room temperature fluorescence intensity and caused a shift towards shorter wavelengths. The low temperature fluorescence measurements showed that UV-B impairs energy transfer from phycocyanin to allophycocyanin B and the extent of damage may be reduced by the exposure to supplemental WL. This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | allophycocyanin chlorophyll fluorescence phycocyanin |
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