Cultivation
Several strains of Pelagibacter ubique have been cultured thanks to improved isolation techniques. The most studied strain is HTCC1062 (high-throughput cultivation collection).
The factors that regulate SAR11 populations are still largely unknown. They have sensors for nitrogen, phosphate, and iron limitation, and a very unusual requirement for reduced sulfur compounds. It is hypothesised that they have been molded by evolution in a low nutrient ecosystem, such as the Sargasso Sea where it was first discovered.
A population of P. ubique cells can double every 29 hours, which is fairly slow, but they can replicate under low nutrient conditions.
Read more about this topic: Pelagibacter Ubique
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