How enduring could life on Earth truly be? The wonders of nature never cease to amaze scientists that search for answers to the most important question – how life came to be and how it evolved.
Bacteria is the simplest organism on Earth considered to be “alive”. These single-celled microorganisms have the ability to survive in the most destructive environments and reproduce.
Last year, a Japanese scientific team reported a most incredible achievement. After collecting sediment from the seafloor more than a decade ago, scientists have revived bacteria more than 100 million years old.
The plot seems to be taken from a science fiction movie – at the bottom of the most remote part of the ocean, scientists drilled wells and found ancient sediments there, in which there were oxygen and ancient microbes. The latter seemed to be dead, but, having received enough nutrients, they began to actively develop.
This is the first time scientists have revived ancient organisms that lived at the same time as dinosaurs.
Scientists revive 101.5 million years old bacteria
The study, which states that bacteria, 101.5 million years old, were collected from the ocean floor, and then began to feed and reproduce, was published last year in the scientific journal Nature Communications.
Oceanologists have collected at depth in the region of the South Pacific Gyre (it is believed that this is a lifeless zone where only bacteria live) samples of deep-sea sedimentary rocks.
Scientists noticed that the rocks from the bottom of the Pacific Ocean were unusually porous. There was relatively much oxygen in them for that depth. This is how the idea arose that traces of bacteria or living microbes that have adapted to existence in conditions when there is practically no food may remain in these rocks.
The study confirmed that bacteria were present even in the most ancient layers of the rock.
Scientists found oxygen in all the wells, which could support life in microorganisms for millions of years. In order to find out if there were such ancient microbes in the samples, they incubated them and provided them with enough food.
Soon they began to show signs of life and not a couple, but almost all, even the oldest. As scientists have established, the age of 99.1% of microbes dates back to at least 101.5 million years.
These microorganisms are some of the most ancient living creatures on Earth, they were contemporaries of the dinosaurs. But still not the most – some spores of bacteria frozen in resin were revived by scientists after they had lain in amber for 250 million years. However, these were not bacteria themselves, but spores, so they can be ignored.
Scientists noted that these microbes have a low metabolic rate, and they reproduce more slowly than other microbes living at such a depth.
The genomes of these organisms have hardly changed since the Mesozoic, so scientists will be able to understand how bacteria evolved over a hundred million years.
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• Dunham, W. (2020, July 28). Scientists revive 100 million-year-old microbes from deep UNDER SEAFLOOR.
• Frazer, J. (2021, March 04). 100-Million-Year-Old seafloor Sediment bacteria have been resuscitated.
• Javed, S. (n.d.). 100-Million-Year-Old seafloor BACTERIA resuscitated by scientists.
• Letzter, R. (2020, July 30). Sleeping microbes wake up after 100 million years buried under the seafloor.
• Morono, Y., Ito, M., Hoshino, T., Terada, T., Hori, T., Ikehara, M., . . . Inagaki, F. (2020, July 28). Aerobic microbial life persists in oxic marine sediment as old as 101.5 million years.
• Pennisi, E., Normile, D., Kupferschmidt, K., Duke, S., Clery, D., & Moutinho, S. (2020, July 31). Scientists pull Living microbes, possibly 100 million years old, from beneath the sea.