Occurrence of UV-absorbing, mycosporine-like compounds among cyanobacterial isolates and an estimate of their screening capacity

Article Abstract:

The commonality and diversity of water-soluble compounds among cyanobacteria from intensely solar radiation-exposed habitats are discussed. A variety of isolatesof cyanobacteria were analyzed for mycosporine amino acid-like, ultraviolet absorbing and water soluble substances. The specific absorption in the cells, the cell size and the presence of the extracellular sheath pigment scytonemin were estimated to determine their role as sunscreen agents. Results indicate that substantial protection from photodamage is afforded by these parameters.

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Phylogeography of the thermophilic cyanobacterium Mastigocladus laminosus

Article Abstract:

The demographic and evolutionary processes that have shaped the geographic patterns of genetic diversity of the thermophilic cyanobacterium Mastigocladus laminosus were investigated. It was observed that populations are typically genetically differentiated on local geographical scales which suggest the existence of dispersal barriers and indicates that genetic exchange has played an important role in generating novel variation during Mastigocladus laminosus diversification.

Environmental aspects, Genetic aspects, Biological diversity, Biodiversity

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Evidence regarding the UV sunscreen role of a mycosporine-like compound in the cyanobacterium Gloeocapsa sp

Article Abstract:

An assessment of the possible sunscreen role of mycosporine-like amino acids (MAA) in the cyanobacterium Gloeocapsa sp. is discussed. Expriments involved the exposure ofGloeocapsa to an extreme range of UV-320 radiation. Specific contents of MAA from shift-down and shift-up experiments were calculated and compared. Results indicate the possible involvement in the process of photoadaptation to UV radiation of the MAA in the Gloeocapsa species.

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