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Festuca rubra  subsp.  pruinosa  is a perennial grass that inhabits sea cliffs of the Atlantic coasts of Europe. In this unhospitable environment plants grow in rock crevices and are exposed to abiotic stress factors such as low nutrient availability, wind, and salinity.  Festuca rubra  subsp.  pruinosa  is a host of the fungal endophyte  Epichloë festucae , which colonizes aerial organs, but its root mycobiota is unknown. The culturable endophytic mycobiota of FRP roots was surveyed in a set of 105 plants sampled at five populations in marine cliffs from the northern coast of Spain. In total, 135 different fungal taxa were identified, 17 of them occurred in more than 10% of plants and in two or more populations. Seven taxa belonging to  Fusarium ,  Diaporthe , Helotiales,  Drechslera ,  Slopeiomyces , and  Penicillium  appeared to be constituents of the core microbiome of  Festuca rubra  subsp.  pruinosa  roots because they occurred in more than 20% of the plants analyzed, and at three or more populations. Most fungal strains analyzed (71.8%) were halotolerant. The presence of  Epichloë festucae  in aboveground tissue was detected in 65.7% of the plants, but its presence did not seem to significantly affect the structure of the core or other root microbiota, when compared to that of plants free of this endophyte. When plants of the grass  Lolium perenne  were inoculated with fungal strains obtained from  Festuca rubra  subsp.  pruinosa  roots, a  Diaporthe  strain significantly promoted leaf biomass production under normal and saline (200 mM NaCl) watering regimes. These results suggest that the core mycobiome of  Festuca rubra  subsp.  pruinosa  could have a role in host plant adaptation, and might be useful for the improvement of agricultural grasses.

A Survey of Culturable Fungal Endophytes From Festuca rubra subsp. pruinosa, a Grass From Marine Cliffs, Reveals a Core Microbiome