Acidobacteriota

Tiny life lives in the dirt.

These tiny things live in many places. They live in soil and in the ocean. They can even live in dark caves.

Some like to live in sour ground. This sourness helps them grow. They are very common in the dirt.

Scientists find them hard to grow. They must use special air to help. We are still learning about them.

They help the world stay healthy.

Acidobacteriota are a group of tiny living things. We call them bacteria. They live in many places. You can find them in soil and oceans. They also live in caves and hot springs. Some live in wood that is rotting. They can even live in soil with metal in it.

These bacteria are very common in dirt. They can make up 52% of all bacteria in the soil. Many like to live in sour places. We call these acidophilic, or acid-loving, microbes. Some live in very sour mine water. They can handle a pH of 2 to 3. This means the liquid is very sour.

Scientists find them hard to study. It is difficult to grow them in a lab. This makes it hard to learn how they work. New ways to grow them use high amounts of CO2. CO2 is a gas in the air. Even with this, we only know about 30% of their types. We are still learning how they use food and air. This is a new field of science.

Acidobacteriota is a large group of tiny living things called bacteria. These microbes are found almost everywhere on our planet. You might find them in the deep ocean or in dark caves. They also live in hot springs and rotting wood. Some even live in soil that has metal in it. In many soils, they are very common. They can make up 52% of all the bacteria in the dirt.

These bacteria work in many different ways to stay alive. Most of them are aerobes, which means they need oxygen to live. Some special types are anaerobes that do not need oxygen. They also look for food in different ways. Many of them are oligotrophic, meaning they can live with very little food. They often find carbon in things like sugars. For example, some can use D-glucose or lactose. Other types can even use chitin for energy.

Scientists have been studying these microbes for a long time. The first species, called Acidobacterium capsulatum, was found in 1991. Later, in 1997, experts realized they were a special group. By 2012, they were officially named a phylum. The first genome, which is a map of their DNA, was sequenced in 2006. Today, scientists use special tools to group them into 26 subdivisions. This helps them organize all the different types they find.

Learning about them is a big job for scientists. It is very hard to grow them in a lab. This is because they often need very specific conditions to thrive. Scientists have tried using high amounts of CO2 to help them grow. Even so, we have only documented about 30% of their subdivisions. Some types are even found in soil with uranium. We also know that group V has a G+C content above 60%. Group III is about 10% lower than that.

Understanding Acidobacteriota helps us learn how the Earth works. Because they are so common in soil, they help the whole ecosystem. They play a role in how nutrients move through the ground. For instance, some have genes that help them use nitrogen. They can take up ammonium through special channels in their cells. This connects them to the way plants grow in nature. As we study them more, our knowledge will keep growing.

Acidobacteriota is a large phylum of Gram-negative bacteria. These microbes are found in many different environments across the Earth. They live in soil, oceans, and even dark caves. Some can survive in hot springs or decomposing wood. You can even find them in soil that contains metal. They are especially common in soil habitats. In some places, they make up 52% of the total bacterial community.

Many members of this phylum are acidophilic, meaning they thrive in acidic conditions. For example, Acidobacterium capsulatum was the first member described. Some bacteria from acid mine drainage are highly adapted to low pH levels. These specific strains live in environments with a pH between 2 and 3. This adaptation may come from cell specialization or enzyme stability. Other members thrive in different settings depending on nutrients and pH levels.

Scientists classify these bacteria into 26 accepted subdivisions. They use the sequencing of 16S rRNA gene regions to do this. Subdivision 1 is the largest and contains the most known species. It includes 11 known genera and 40 conclusive species. Other subdivisions include 3, 4, 8, 10, and 23. Much of this variety was discovered in soils contaminated with uranium. Subdivision 2 contains unclassified members that can contaminate DNA extraction kits.

Most Acidobacteriota are aerobes, which means they use oxygen to live. However, some members in subdivisions 8 and 23 are anaerobes. These do not require oxygen to function. Some soil strains have the genomic potential to breathe oxygen even at very low concentrations. Many are also considered oligotrophic bacteria. This means they are successful in environments with very little organic carbon. This ability allows them to dominate in nutrient-poor habitats.

The history of studying this phylum is relatively recent. The first species, Acidobacterium capsulatum, was discovered in 1991. In 1997, researchers recognized them as a distinct clade. They were not officially recognized as a full phylum until 2012. The first genome was sequenced in 2006. Today, this is a growing field of microbiology. Much of what we know is still changing as new data emerges.

Metabolism in this phylum is quite complex and diverse. Many members are heterotrophic, meaning they get energy from organic compounds. Some in subdivision 1 use D-glucose, D-xylose, or lactose for carbon. Subdivision 4 members have been found to use chitin as a carbon source. Interestingly, only one species, Telmactobacter bradus, can process cellulose. Scientists believe xylan degradation is the most universal carbon breakdown ability.

Researching these bacteria is difficult because they are hard to grow in labs. Most species have not been cultured in a controlled environment. Scientists have tried using high amounts of CO2 and low nutrients to help. Even so, only about 30% of subdivisions have documented species. This makes it hard to match DNA sequences with actual behavior. We are still learning how they process nitrogen and carbon.

Acidobacteriota also play a role in the nitrogen cycle. While there is no clear evidence of nitrogen fixation, some members show specific traits. Geothrix fermentans can reduce nitrate and contains the norB gene. This gene was also found in Koribacter verstailis and Solibacter usitatus. Members of subdivision 1 contain the nirA gene. Most genomes show they can take up ammonium through special transporter genes. This helps connect these microbes to the wider ecosystem.