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Common Freshwater Cyanobacteria Grow in 100% CO2

机译：普通淡水蓝细菌在100％CO2中生长

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Cyanobacteria and similar organisms produced most of the oxygen found in Earth's atmosphere, which implies that early photosynthetic organisms would have lived in an atmosphere that was rich in CO2 and poor in O2. We investigated the tolerance of several cyanobacteria to very high (>20 kPa) concentrations of atmospheric CO2. Cultures of Synechococcus PCC7942, Synechocystis PCC7942, Plectonema boryanum, and Anabaena sp. were grown in liquid culture sparged with CO2-enriched air. All four strains grew when transferred from ambient CO2 to 20 kPa partial pressure of CO2 (pCO2), but none of them tolerated direct transfer to 40 kPa pCO2. Synechococcus and Anabaena survived 101 kPa (100%) pCO2 when pressure was gradually increased by 15 kPa per day, and Plectonema actively grew under these conditions. All four strains grew in an anoxic atmosphere of 5 kPa pCO2 in N2. Strains that were sensitive to high CO2 were also sensitive to low initial pH (pH 56). However, low pH in itself was not sufficient to prevent growth. Although mechanisms of damage and survival are still under investigation, we have shown that modern cyanobacteria can survive under Earth's primordial conditions and that cyanobacteria-like organisms could have flourished under conditions on early Mars, which probably had an atmosphere similar to early Earth's.
机译：蓝细菌和类似的生物产生了地球大气中发现的大部分氧气，这意味着早期的光合生物将生活在富含二氧化碳而富含氧气的大气中。我们研究了几种蓝细菌对非常高（> 20 kPa）的大气二氧化碳浓度的耐受性。 Synechococcus PCC7942，Synechochocystis PCC7942，Plectonema boryanum和Anabaena sp。的培养。在充满二氧化碳富集空气的液体培养物中生长。当从周围的CO2转移到20 kPa的CO2分压（pCO2）时，所有四个菌株均生长，但它们都不容许直接转移到40 kPa pCO2。当压力逐渐增加到每天15 kPa时，Synechococcus和Anabaena存活了101 kPa（100％）pCO2，并且在这种情况下翼状lect肉积极生长。所有四个菌株均在N2中在5 kPa pCO2的缺氧气氛中生长。对高CO2敏感的菌株对低初始pH（pH 56）也敏感。但是，低pH值本身不足以阻止其生长。尽管损害和生存的机制仍在研究中，但我们已经表明现代蓝细菌可以在地球原始条件下生存，并且类似蓝细菌的生物体可能在火星早期的条件下蓬勃发展，而火星的大气层可能类似于地球早期。

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