Abstract
Effects of two intensities (1 and 5 W m−2) of UV-B radiation on the synthesis of UV-absorbing compounds in a terrestrial cyanobacterium Nostoc flagelliforme were investigated. UV-B radiation resulted in lower biomass. Short period (less than 12 h) of UV-B radiation caused an increase of chlorophyll a content, but subsequent duration of treatment (more than 24 h) resulted in a rapid decrease. N. flagelliforme synthesized UV-absorbing compounds such as scytonemin and mycosporine-like amino acids (MAAs) in response to UV-B radiation. Upon 48 h of exposure to UV-B radiation, scytonemin content in cells increased by 103.8 and 164.0 % at 1 and 5 W m−2, respectively. Oligosaccharide-linked mycosporine-like amino acids increased by 145.5 % after 12 h at 5 W m−2 and 114.5 % after 48 h at 1 W m−2 UV-B radiation. HPLC analysis showed that nine MAAs existed in N. flagelliforme cells both from liquid suspension culture and field colony. But the concentration and kinds of them were different. At the two distinct levels of UV-B radiation, the content of particular MAAs increased, declined, or remained unchanged. Moreover, the appearance of two new MAAs was observed.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (no. 20806047), China Postdoctoral Science Foundation (no. 20090450116), and Excellent Middle-Aged and Young Scientist Award Foundation of Shandong Province (no. BS2011SW029)
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Yu, H., Liu, R. Effect of UV-B radiation on the synthesis of UV-absorbing compounds in a terrestrial cyanobacterium, Nostoc flagelliforme . J Appl Phycol 25, 1441–1446 (2013). https://doi.org/10.1007/s10811-013-9978-6
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DOI: https://doi.org/10.1007/s10811-013-9978-6