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4257774 
Journal Article 
Effects of solar radiation on pigmentation and induction of a mycosporine-like amino acid in two cyanobacteria, Anabaena sp and Nostoc sp ISC26 
Roshan, SK; Farhangi, M; Emtyazjoo, M; Rabbani, M 
2015 
Yes 
European Journal of Phycology
ISSN: 0967-0262 
50 
2 
173-181 
WOS:000353927800004 
The effect of filtered natural solar radiation, including photosynthetically active radiation (PAR) and PAR+ultraviolet radiation (UVR), on pigmentation and synthesis of a UV absorbing mycosporine-like amino acid' (MAA) in two filamentous and heterocystous cyanobacteria, Anabaena sp. and Nostoc sp. ISC26 was studied over 3 days. In Anabaena sp. and Nostoc sp. ISC26, chlorophyll a (chl a) content decreased after 72 h to 5.45 +/- 0.09 and 7.01 +/- 0.54 g mg(-1) DW respectively under PAR treatments; and to 4.33 +/- 0.22, 6.12 +/- 0.04 g mg(-1) DW in PAR+UV treatments, as did carotenoids (Car) (2.68 +/- 0.01, 2.93 +/- 0.01 g mg(-1) DW) (PAR), (2.53 +/- 0.01, 2.57 +/- 0.05 g mg(-1) DW) (PAR+UV). A considerable increase was observed in the carotenoid:chlorophyll a (Car/Chl a) ratio as a result of carotenoid accumulation in the first 24 h and reduction of chlorophyll in the following days. A single MAA was isolated, purified by high performance liquid chromatography (HPLC) and identified as shinorine. Shinorine concentration increased significantly during 72 h specifically under PAR+UV (1270.8 +/- 50.42, 2208.09 +/- 73.04 nmol g(-1) DW) in Anabaena sp. and Nostoc sp. ISC26, respectively, indicating an adaptation strategy of cyanobacteria against harmful solar short wavelength radiation especially in natural habitats. 
Anabaena sp; HPLC; MAA; Nostoc sp; ISC26; PAR; pigmentation