The influence of green light on cyanobacterial fine structure: applicability for dim environments
Roldán, Mònica Hernández-Mariné
The purpose of this study was to evaluate the potential of green light (GL) for preventing biofilm growth in areas of cultural patrimony, which are normally illuminated with artificial white light (WL). The aerophytic cyanobacterium Gloeocapsopsis magma, colonizer of caves, was cultured under either GL or WL and its morphology and ultrastructure were compared. Spectral analysis of pigments showed high levels of phycoerythrin. GL light quality affected the morphology of colonies, thickness and organization of the sheath, cell size and formation of storage products. At the fine structure level the number of thylakoids was significantly decreased, compared to WL grown cells. Cells from two-months and sixmonths old WL cultures did not differ either in the number or disposition of their thylakoids. Although G. magma exposed to GL survived in nature and in culture the unbalanced fine structure reveals the limits of its adaptation.