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Salt needed: Tolerance lessons from a dead sea fungus
Date:5/9/2014

Despite its name, the Dead Sea does support life, and not just in the sense of helping visitors float in its waters. Algae, bacteria, and fungi make up the limited number of species that can tolerate the extremely salty environment at the lowest point on Earth.

Some organisms thrive in salty environments by lying dormant when salt concentrations are very high. Other organisms need salt to grow. To learn which survival strategy the filamentous fungus Eurotium rubrum uses, a team of researchers led by Eviatar Nevo from the University of Haifa in Israel, Igor Grigoriev of the U.S. Department of Energy Joint Genome Institute (DOE JGI), and Gerhard Rambold, University of Bayreuth, Germany and their colleagues studied its genome. They described their findings in the May 9, 2014 issue of Nature Communications.

"Understanding the long-term adaptation of cells and organisms to high salinity is of great importance in a world with increasing desertification and salinity," the team wrote. "The observed functional and structural adaptations provide new insight into the mechanisms that help organisms to survive under such extreme environmental conditions, but also point to new targets like the biotechnological improvement of salt tolerance in crops." In principle this discovery could revolutionize saline agriculture worldwide by laying the groundwork of understanding necessary to appropriately using salt resistance genes and gene networks in crops to enable them to grow in desert and saline environments.

The DOE JGI team first sequenced, assembled and annotated the 26.2-million base genome of E. rubrum. The team found that the genome contained just over 10,000 predicted genes. They also found that the E. rubrum proteins had higher aspartic and glutamic acid amino acid levels than expected. When the team compared E. rubrum's gene families against those in two other halophilic species (Wallemia ichthyophaga
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Contact: David Gilbert
degilbert@lbl.gov
925-927-2541
DOE/Joint Genome Institute
Source:Eurekalert

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