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Effects of salinity and ultraviolet radiation on the concentration of mycosporine‐like amino acids in various isolates of the benthic cyanobacterium Microcoleus chthonoplastes
Author(s) -
Karsten Ulf
Publication year - 2002
Publication title -
phycological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.438
H-Index - 44
eISSN - 1440-1835
pISSN - 1322-0829
DOI - 10.1046/j.1440-1835.2002.00266.x
Subject(s) - salinity , intertidal zone , biology , microbial mat , osmolyte , cyanobacteria , botany , ecology , bacteria , genetics
SUMMARY The effects of salinity and ultraviolet B (UV‐B) treatment on the intracellular mycosporine‐like amino acid (MAA) concentration in three isolates of the benthic cyanobacterium Microcoleus chthonoplastes from the Baltic Sea (WIS), Spain (EBD) and Australia (TOW) were compared. All strains contained shinorine and, in addition, both EBD and TOW exhibited the unknown MAA‐332, and WIS exhibited the unknown MAA‐346. Salinity treatment led to MAA accumulation in TOW and WIS, but not in EBD. Whereas UV‐B exposure was accompanied by a strong increase in MAA in EBD and TOW, WIS did not survive the treatment. All data indicate isolate‐specific MAA accumulation patterns under different environmental conditions and can be explained by ecotypic differentiation. A double function of MAAs as organic osmolytes and photoprotect‐ants seems possible.