Photosynthesis in extreme environments Fotosyntéza rostlin v extrémních prostředích (v extrémech prostředí) M. Barták 2014.

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Photosynthesis in extreme environments Fotosyntéza rostlin v extrémních prostředích (v extrémech prostředí) M. Barták 2014

Tolerance ke stínu

Tropický deštný les

Dostupné záření v úrovni půdy: 1 mikromol m-2 s-1 Extrémně stinná stanoviště: Tropický deštný les

Jak posoudit toleranci na stín Source:

Cryptoendolithic vegetation It is a whole ecosystem growing inside clear rocks, just a few millimeters under the surface and includes an association of bacteria and algae. It is visible as the green stripe on this split rock. Enough light and water gets through the rock for photosynthesis, and that's all you need to live, right ? Picture size about 5cm.

Beacon Sandstone, Dry Valleys, Antarctica

Dry Valleys, Antarctica

The antarctic cryptoendolithic microbial ecosystem lives under sandstone surfaces in the dry valley region (Friedmann and Ocampo,1976; Friedmann, 1977). It is relatively simple, consisting of cyanobacterial or algal primary producers, fungal consumers, and bacterial decomposers. It lacks animals and, possibly, also archaea. With rock temperatures rising above 0 °C only for a few weeks in the austral summer to allow photosynthetic productivity, this ecosystem is permanently poised on the edge of existence.

Photosynthetic rates (1991) Carl G Johnston, J Robie Vestal (1991) Lichens: 4.5 ng C h -1 m -2 Cyanobacteria: 3.0 ng C h -1 m -2 Please note that sample temperature was o C

Rio Tinto (Spain) The red waters (pH~2) of the Rio Tinto, Spain, coloured red by jarosite [HFe3(SO4)2(OH)6] formed by chemolithotrophic iron- and sulfur-oxidizing prokaryotes. Photograph: Extremophiles Lab, CAB, Madrid.

Acidophilic algae The most important Photosynthetic Primary Producers in the Rio Tinto is Acidophilic Algae. These microbes also require special adaptations to withstand low pH and strong concentrations of heavy metals. Aacidophilic algae accounts for 65% of biomass within the Rio Tinto ecosystem. The organisms identified were Bacillariophyceae (Diatoms), Bacillariophyceae (Diatoms), Chlorophyta (Chlamydomonas, Klebsormidium and Zignema), Chlorophyta (Chlamydomonas, Klebsormidium and Zignema), Euglenozoa (Euglena), Euglenozoa (Euglena), Rhodophyta (Galdieria) Rhodophyta (Galdieria)

Chlamydomonas sp. (Rio Tinto) Messerli et al. (2005): Transmitted light image of Chlamydomonas sp. isolated from the Rio Tinto. (B) Pseudocolored images of BCECF fluorescence in Chlamydomonas sp.