Light-induced changes within photosystem II protects Microcoleus sp. in biological desert sand crusts against excess light.

The filamentous cyanobacterium Microcoleus vaginatus, a major primary producer in desert biological sand crusts, is exposed to frequent hydration Purse Kits (by early morning dew) followed by desiccation during potentially damaging excess light conditions.Nevertheless, its photosynthetic machinery is hardly affected by high light, unlike "model" or

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