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Home • Scleroderma citrinum hr. v1.0
Photo of Scleroderma citrinum hr. v1.0
Photo: Fruiting body of Scleroderma citrinum hr. (photo credits: Huchen Li)

In the "1KFG: Deep Sequencing of Ecologically-relevant Dikarya" project (CSP1974), we aim to sequence additional sampling of genomic diversity within keystone lineages of plant-interacting fungi and saprophytic fungi that are of special ecological importance for understanding terrestrial ecosystems. The present genome has been sequenced within the framework of the Mycorrhizal Genomics Initiative, a project aiming to provide insights into the molecular mechanisms driving the evolution of mutualistic mycorrhizal symbioses.

The common earthball, Scleroderma citrinum

Scleroderma citrinum (Sclerodermataceae, Boletales) is a very common and widespread ectomycorrhizal gasteromycete species which produces large conspicuous sporocarps, so-called "earthballs", in different forest environments or adjacent to forest areas. S. citrinum sporocarps appear early in the fruiting succession of ectomycorrhizal fungi. This is an early stage ectomycorrhizal fungus, primary colonizer of mining waste, which enables it to spread rapidly and to colonize young root systems of numerous tree species. The Scleroderma genus has a worldwide range and S. citrinum is commonly recorded in the temperate regions from the Northern hemisphere.

The present mycelial strain, so-called "hr.", has been isolated from a young fruiting body growing under Chinese chestnuts (Castanea mollissima) in Huairou near Beijing, China. This strain is used to establish ectomycorrhizal roots in vitro with Castanea mollissima seedlings.

The genome of the mycelial strain Foug A of S. citrinum collected in Northeastern France has also been sequenced by JGI.

Researchers who wish to publish analyses using data from unpublished CSP genomes are respectfully required to contact the PIs (Drs. Francis Martin and Huchen Li) and JGI to avoid potential conflicts on data use and coordinate other publications with the CSP master paper(s).