Navigation Links
Stanford biologists help solve fungal mysteries
Date:4/17/2014

Pine forests are chock full of wild animals and plant life, but there's an invisible machine underground. Huge populations of fungi are churning away in the soil, decomposing organic matter and releasing carbon into the atmosphere.

Despite the vital role these fungi play in ecological systems, their identities have only now been revealed. A Stanford-led team of scientists has generated a genetic map of more than 10,000 species of fungi across North America. The work was published this week in the Proceedings of the National Academy of Sciences.

Fungi are much more important than most people realize, said Kabir Peay, an assistant professor of biology at Stanford and senior author on the new paper. "They are the primary decomposers in most of the planet's ecosystems," he said, "and if not for them, dead material would accumulate to the point where most other biological processes on Earth would grind to a halt."

Soil fungi can be divided into two primary groups. The saprotrophs live in the top layer of soil, digesting dead matter, breaking up molecules into individual components converting proteins into amino acids and starches to simple sugars, and freeing up elements such as nitrogen that plants rely on for growth.

The other group, mycorrhizal fungi, have an even closer bond with plants, living among their roots and converting older forms of organic matter into nitrogen and phosphorus for the plants. In return, the plants feed these fungi a steady stream of sugars they obtain from photosynthesis.

The soil stores three to four times as much carbon as the atmosphere, and all this microorganism activity also releases some of that carbon into the air, to a tune of 10 times the amount of carbon into the atmosphere as humans release through emissions.

"It's a huge flux of carbon into the atmosphere, and fungi are the engines," said Jennifer Talbot, a postdoctoral research fellow in Peay's lab and first author on the study. "But we do not know how much diversity matters in maintaining the carbon cycle. Are all fungi doing the same thing? Can you kill half the species on Earth and still have the same amount of carbon dioxide released into the atmosphere, carbon stored on land and nutrients recycled?"

DNA in the dirt

These questions are impossible to answer without first knowing which fungi are out in the world. So the researchers traveled to 26 pine forests across North America and collected 10-centimeter-deep soil cores, more than 600 in all. Within hours of collection, and with the assistance of local scientists and universities, they preserved the samples to extract and isolate the fungal DNA. The researchers then used modern genomic tools to sequence unique stretches of the environmental DNA that can be used as barcodes to identify all of the fungal species present in each sample.

The sequencing revealed more than 10,000 species of fungi, which the researchers then analyzed to determine biodiversity, distribution, and function by geographical location and soil depth. Interestingly, Peay said, there was very little overlap in the fungal species from region to region; East Coast fungi didn't show up on the West Coast or Midwest, and vice versa.

"People oftentimes assume that similar habitats in, say, North Carolina and California would have similar fungi, but this is the opposite of what we find," Peay said. "What's more interesting, despite the fact that soil fungal communities in Florida and Alaska might have no fungi in common, you find that many of the processes and the functional rates are convergent. The same jobs exist, just different species are doing them."

The team found this to be particularly true when comparing the functionality of fungi at different strata of the core samples. Even though the samples were collected thousands of miles apart, fungi near the top all performed the same task; similarly, bottom fungi performed very similar functions across the continent.

Peay said that more work is needed to understand fungal dispersal mechanisms and whether that plays a role in restricting species to particular regions, but the current finding that each bioregion has its own unique fungal fingerprint indicates that fungi could prove to be powerful forensic markers.

Impact on the climate

One surprising discovery was related to fungi producing oxidoreductases, enzymes used to break down particularly old forms of carbon-based molecules. In the study, the activity of oxidoreductases was associated with the abundance of mycorhizzal fungi. The new results suggest that these fungi may be far busier in degrading old organic material than previously thought.

"If mycorrhizal fungi are responsible for breaking down these types of carbon, even to a small degree, it totally changes our concept of how carbon is cycled through ecosystems and released into the atmosphere," Talbot said. "This shows that we really need to think about the biology of the system. We hope to provide some simple parameters so folks building climate change models will be able to fold in this type of biology."


'/>"/>

Contact: Bjorn Carey, Stanford News Service
bccarey@stanford.edu
650-725-1944
Stanford University
Source:Eurekalert

Related biology news :

1. Behind the scenes of the IPCC report, with Stanford scientists
2. Stanford professor maps by-catch as unintended consequence of global fisheries
3. Wind farms can provide society a surplus of reliable clean energy, Stanford study finds
4. Ticks may cause double trouble, Stanford scientists find
5. Stanford scientist to unveil 50-state plan to transform US to renewable energy
6. Stanford climate scientist to discuss state of climate science, coming risks
7. Salk Institute and Stanford University to lead new $40 million stem cell genomics center
8. Stanford researchers discover how brain regions work together, or alone
9. Stanford and Google team up to simulate key drug receptor
10. Stanford researchers take a step toward developing a universal flu vaccine
11. Stanford scientists probe abandoned mine for clues about permanent CO2 sequestration
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/16/2017)... , Feb. 16, 2017  Genos, a ... announced that it has received Laboratory Accreditation from ... Accreditation is presented to laboratories that meet stringent ... demonstrate scientifically rigorous processes. "Genos is ... in laboratory practices. We,re honored to be receiving ...
(Date:2/13/2017)... Former 9/11 Commission border counsel and Special Counsel to ... of Identity Strategy Partners, LLP, today releases the following ... Protecting the Nation From Foreign Terrorist Entry Into the ... Trump,s ,Travel Ban, Executive Order gains more notoriety and ... ban, it is important that our national discourse regain ...
(Date:2/8/2017)... 8, 2017 About Voice Recognition Biometrics Voice ... it against a stored voiceprint template. Acoustic features ... and tone are compared to distinguish between individual ... as most PCs already have a microphone and ... recognition biometrics are most likely to be deployed ...
Breaking Biology News(10 mins):
(Date:2/24/2017)... ... 2017 , ... Chef Jodi Abel has returned from her three-week tour ... she gained a number of delicious recipes and new techniques to share with her ... Western Cape province. It is internationally renowned for its incredible wine farms, beautiful ...
(Date:2/24/2017)...  Driven by consumers, preference towards more natural ... growing categories, finds the recently published U.S. volume ... Multi-regional Market Analysis and Opportunities study by ... "Biotechnology actives are derived from natural ... for skin and hair care applications," explains ...
(Date:2/24/2017)... 24, 2017  VWR Corporation (NASDAQ: VWR), the leading global ... production customers, today reported its financial results for the fourth ... Highlights: 4Q16 record quarterly net sales ... an organic basis. 4Q16 EMEA-APAC ... basis, while the Americas net sales increased 2.5%, or down ...
(Date:2/23/2017)... Madison, Wisconsin (PRWEB) , ... February 23, 2017 ... ... their Drug Discovery Services portfolio to include an array of biochemical ... clients with reliable data to drive their hit-to-lead and SAR programs, including inhibitor ...
Breaking Biology Technology: