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Cyanobacteria: Habitats and Species

Büdel, Burkhard Lüttge, Ulrich (Editor) ; Beck, Erwin (Editor) ; Bartels, Dorothea (Editor)

Ecological Studies, Plant Desiccation Tolerance, pp.11-21

Berlin, Heidelberg: Springer Berlin Heidelberg 2011

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  • Título:
    Cyanobacteria: Habitats and Species
  • Autor: Büdel, Burkhard
  • Lüttge, Ulrich (Editor) ; Beck, Erwin (Editor) ; Bartels, Dorothea (Editor)
  • Assuntos: Life Sciences ; Plant Ecology ; Plant Physiology ; Plant Genetics & Genomics ; Plant Biochemistry ; Plant Anatomy/Development ; Botany
  • É parte de: Ecological Studies, Plant Desiccation Tolerance, pp.11-21
  • Descrição: Cyanobacteria were most probably the first group of organisms performing an oxygen releasing photosynthesis. Their possible fossil origin (“look-alikes”) from Apex chert of north-western West Australia dates back to about 3.46 billion years (Schopf 2000). However, the oldest unambiguous fossil cyanobacteria were found in tidal-flat sedimentary rocks and are about 2 billion years old (Hofmann 1976). With the onset of oxygenic photosynthesis between 2.45 and 2.32 billion years ago (Rasmussen et al. 2008), the ancient Earth’s oxygen-free atmosphere experienced a deep impact with the sharp rise of oxygen. Before the evolution of respiration, the oxygen was highly toxic to life, and as a consequence, the first global catastrophe for most of the organisms living on earth to that date followed. Today, cyanobacteria are found in almost all habitats and biomes present on earth (Whitton and Potts 2000). However, to successfully colonize terrestrial habitats does also mean to be able to resist extreme desiccation. Air-drying does severely harm membrane structure, proteins, and nucleic acids and is lethal to the majority of organisms on Earth (Billi and Potts 2002). During their long evolutionary history, cyanobacteria developed the ability of their cells to undergo nearly absolute dehydration during air-drying without being killed, a phenomenon known as anhydrobiosis. This is also referred to as “desiccation tolerance” and is one mechanism of drought tolerance (Alpert 2005). Consequently, cyanobacteria colonized more and more of the available terrestrial habitats. Dehydration in air can lead to a removal of all but 0.1 g water/g dry weight (Billi and Potts 2000).
  • Editor: Berlin, Heidelberg: Springer Berlin Heidelberg
  • Data de publicação: 2011
  • Idioma: Inglês

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