Abstract
UV-B (0.4 W m−2) irradiation and cadmium (2 and 8 μM) treatments separately inhibited the survival, growth, pigment content, and photosynthetic electron transport in Plectonema boryanum. Phycocyanin was the main target to UV-B and Cd and it was followed by chlorophyll a and carotenoids. UV-B and Cd caused strong inhibition on activities of photosystem 2 (PS2) and the whole electron transport chain, whereas photosystem 1 (PS1) was the least affected. UV-B and Cd treatment accelerated respiration, lipid peroxidation, and the activities of superoxide dismutase and catalase. However, enhancement in catalase activity was considerably less (5 − 50 %) as compared to SOD activity. As compared to individual treatment, the effect of their combination (UV-B + Cd) was more detrimental to the above parameters. A synergistic interaction of UV-B and Cd is probably due to increased cadmium uptake as a result of increased membrane permeability caused by lipid peroxidation in P. boryanum after UV-B exposure.
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Abbreviations
- ASC:
-
ascorbate
- Car:
-
carotenoids
- Chl:
-
chlorophyll
- DCMU:
-
3-(3′-4′-dichlorophenyl)-1,1-dimethyl urea
- DCPIP:
-
2,6-dichlorophenol indophenol
- MDA:
-
malondialdehyde
- MV:
-
methyl viologen
- pBQ:
-
p-benzoquinone
- PC:
-
phycocyanin
- PS:
-
photosystem
- UV-B:
-
ultraviolet radiation (280–315 nm)
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Prasad, S.M., Zeeshan, M. UV-B radiation and cadmium induced changes in growth, photosynthesis, and antioxidant enzymes of cyanobacterium Plectonema boryanum . Biol Plant 49, 229–236 (2005). https://doi.org/10.1007/s10535-005-0236-x
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DOI: https://doi.org/10.1007/s10535-005-0236-x