Scientists have described three new species of bacteria discovered on the ISS. Credit: Pixabay

Mystery Microbes Discovered On International Space Station Are Unknown To Science

One of the strains of bacteria could help astronauts grow plants on Mars in the future.


Scientists from India and the United States have isolated four strains of bacteria from samples collected on the International Space Station. Moreover, three of them were previously unknown to science. All four strains belong to a family of bacteria that are commonly found in water and soil here on Earth which makes their discovery on ISS even more surprising.

However, astronauts have been growing greens on the ISS for a long time, so it is not surprising that microbes from the soil can be found onboard. The species of bacteria are from the Methylobacteriaceae family, which are considered beneficial to plants and soil and can be called “good” bacteria. They take part in plant growth, protection from diseases, and the process of nitrogen fixation, which is important for soil fertility.


Methylorubrum rhodesianum

One of the strains is a bacteria known as Methylorubrum rhodesianum which has been thoroughly researched. Genome sequencing showed that the other three belong to the same species that scientists have not described. These strains have now been named IF7SW-B2T, IIF1SW-B5, and IIF4SW-B5.

It is worth noting here that the search for bacteria that stimulate plant growth in conditions of scarcity of resources is an important part of NASA’s ambitious plan to colonize other planets. Therefore, scientists began a detailed genetic analysis of the strains they found.

The researchers found that the IF7SW-B2T strain possesses a number of genes that promote plant development. One of them encodes an enzyme necessary for the production of cytokinins that promote cell division in roots and shoots.


The world of bacteria is large and diverse

The world of bacteria is large and diverse, and scientists admit that so far, only a grain of knowledge is available to them about what else lives onboard the ISS. Now another 1000 samples collected at the space station await to be sent to Earth for study.

As you can guess, this type of research is more difficult than usual as missions to ISS are relatively rare, and not all have the same purpose as bringing back samples. One can only imagine what other discoveries await microbiologists when these 1000 samples get studied.

Until then, scientists will continue studying the three previously unknown bacteria strains from ISS, especially IF7SW-B2T. We are all well-aware of NASA’s ambitions to colonize Mars in the next few decades. While these plans are more or less fiction at this point, the discovery of this bacteria could push microbiologists in the right direction for research.

Colonization will not be possible if we do not have sustainable and reliable ways to grow our own food on Mars. If this bacteria can enhance the growth of plants in isolated and inimical environments, it might lead scientists to the necessary solution.

I think that NASA should make this research an international effort. NASA indeed has scientists from all around the world, but I mean to involve other agencies and organizations in the long-term study of the strains of bacteria from ISS. Simply said, the colonization of Mars should not be a race for greatness as it once was to reach the Moon.


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Bijlani, S., Singh, N., Eedara, V., Podile, A., Mason, C., Wang, C., & Venkateswaran, K. (2021, February 22). Methylobacterium ajmalii SP. nov., isolated from the International space station.
Bowler, J. (n.d.). Microbes unknown to science discovered on the International space station.
Frontiersin. (n.d.). Three bacterial STRAINS discovered on space station may help grow plants on Mars.
Strickland, A. (2021, March 16). Previously unknown bacteria discovered on the space station could help grow plants.

Written by Vladislav Tchakarov

Hello, my name is Vladislav and I am glad to have you here on Curiosmos. As a history student, I have a strong passion for history and science, and the opportunity to research and write in this field on a daily basis is a dream come true.

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