A new study by scientists at the University of California, Davis has found evidence of ancient mitoviruses in the mycorrhizal fungi that form symbiotic relationships with plants. This discovery suggests that viruses may have been a part of the evolution of the fungi for millions of years, and could help explain how the fungi have adapted to different environmental conditions. The researchers found evidence of viruses in the mycorrhizal fungi from all four major families, suggesting that these ancient viruses have been present in the fungi for a long time. The study also suggests that the viruses may be involved in the adaptation of the fungi to different environments. This research provides an important insight into the evolution of these fungi and the role of viruses in the process.

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source: Phys.org