Navigation Links
Visiting researcher at IU leads international team in formal identification of new fungi class
Date:8/12/2011

BLOOMINGTON, Ind. -- A visiting researcher from Sweden in the Indiana University College of Arts and Sciences' Biology Department has led an international team in culturing, characterizing and formally naming a new class of fungi that previously had only been identified through DNA sequencing from environmental samples.

Structures on Roots

The new fungal class Archaeorhizomyces, previously known as Soil Clone Group 1 (SCG1), has now been found in more than 50 ecological studies of soil fungi. Prior to the work reported by the team led by Swedish biologist Anna Rosling, who currently works in the IU Bloomington biology laboratory of Rich Phillips as an associate researcher, the organisms had never been observed in the form of a fruiting body, spore, culture or in any distinctive association in a relationship with a plant. The report, which appears in the Aug. 12 edition of Science, estimates as many as 250 species in the description of the new class.

"Scientists believe that only one-tenth of fungal diversity has been described, and of the fungal lineages known only through environmental DNA sequences, this one -- Soil Clone Group 1 -- was the most common," Rosling said. "And while we still do not know this group's precise ecological niches and the complete life cycle, isolating and describing cultures of this group will allow their role in terrestrial ecosystems to be deciphered, and in turn contribute toward cataloguing and understanding the missing diversity of the fungal kingdom."

First found in tundra soil fungal communities only in summer, Archaeorhizomyces species are now considered globally distributed and with specific ecosystem and habitat associations among some species. The three most sampled species colonized typical ectomycorrhizal habitats, with fungi forming symbiotic relationships with plants by forming a sheath around the root tip of the plant, in this case with roots of pine trees and understory plants preferring acidic soil.

But Rosling said there still is no evidence that Archaeorhizomycetes form mycorrhizal structures in pine roots, and instead may coexist with other fungi in single root tips, showing no preferential growth toward main, primary or secondary roots, and not altering root tip morphology.

Prior to the work researchers were unsure of Archaeorhizomyces' role in the ecosystem, and had theorized that the fungi were mycorrhizal, or obligately associated with the roots of plants, getting carbon from those plants. The new findings provide evidence that Archaeorhizomyces is not mycorrhizal and their apparent association with roots of plants is possibly though association with mycorrhizal fungi.

"Our feeling now is that plant host and habitat specificity for different species of Archaeorhizomycetes may not necessarily be explained by specificity towards the plant, but may instead reflect an association with other root-associated fungi," she said. "When we inoculated onto sterile pine seedlings, the mycelium of one Archaeorhizomycetes, A. finlayi, associated with roots, but no mycorrhizal structures are observed. Yet the inoculated seedlings remained healthy for months with no signs of fungal pathogenicity."

Archaeorhizomycetes is phylogenetically placed within the subphylum Taphrinomycotina in the Ascomycota phylum. Commonly known as sac fungi, Ascomycota is the largest phylum in the fungi kingdom, comprising about 75 percent of all fungi, or more than 64,000 species. Species in the new class are filamentous and threadlike, and because they lack macroscopic features they can not be identified without DNA testing. And while not recognized as forming mycorrhizal structures, they potentially receive nutrition from dead and decaying plant material, the paper reported.

With the new class now properly sequenced, researchers have not only recognized that its abundance had previously been underestimated, but that they have set themselves on a course to better define Archaeorhizomycetes' role in ecosystems and toward identifying more species and populations within the class.


'/>"/>

Contact: Steve Chaplin
stjchap@iu.edu
812-856-1896
Indiana University
Source:Eurekalert  

Related biology news :

1. Researchers decode workings of mysterious, but critical TB drug
2. Researchers fight cholera with computer forecasting
3. Vanderbilt researchers, international team, uncover genes linked to multiple sclerosis
4. Narcissism may benefit the young, researchers report; but older adults? Not so much
5. York U researchers zero in on protein that may help treat obesity, diabetes
6. Researchers use human cells to engineer functional anal sphincters in lab
7. Wayne State researcher discovers antibiotic useful for localized treatment of bone wear
8. Researchers use neutrons to spy on the elusive hydronium ion
9. UGA researchers study threats to white sturgeon
10. Guam researcher studies Mount Pinatubo ecosystem recovery
11. Researchers gain new insights into how tumor cells are fed
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Visiting researcher at IU leads international team in formal identification of new fungi class
(Date:5/16/2016)... --  EyeLock LLC , a market leader of iris-based ... IoT Center of Excellence in Austin, Texas ... embedded iris biometric applications. EyeLock,s iris authentication ... with unmatched biometric accuracy, making it the most proven ... platform uses video technology to deliver a fast and ...
(Date:4/28/2016)... and BANGALORE, India , April 28, 2016 ... a product subsidiary of Infosys (NYSE: INFY ), ... a global partnership that will provide end customers ... mobile banking and payment services.      (Logo: ... innovation area for financial services, but it also plays a ...
(Date:4/19/2016)... -- The new GEZE SecuLogic access control ... system solution for all door components. It can be ... interface with integration authorization management system, and thus fulfills ... dimensions of the access control and the optimum integration ... considerable freedom of design with regard to the doors. ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... ... June 27, 2016 , ... Parallel 6 , the ... today the Clinical Reach Virtual Patient Encounter CONSULT module which enables both ... physician and clinical trial team. , Using the CONSULT module, patients and physicians can ...
(Date:6/27/2016)... ... June 27, 2016 , ... Rolf ... join the faculty of the University of North Carolina Kenan-Flagler Business School ... and entrepreneurship at UNC Kenan-Flagler, with a focus on the school’s international efforts, ...
(Date:6/27/2016)... --  Ginkgo Bioworks , a leading organism design ... awarded as one of the World Economic Forum,s ... innovative companies. Ginkgo Bioworks is engineering biology to ... in the nutrition, health and consumer goods sectors. ... including Fortune 500 companies to design microbes for ...
(Date:6/24/2016)... , June 24, 2016 Epic ... sensitively detects cancers susceptible to PARP inhibitors by ... tumor cells (CTCs). The new test has already ... therapeutics in multiple cancer types. Over ... DNA damage response pathways, including PARP, ATM, ATR, ...
Breaking Biology Technology: