Diversity and origins of endophytic fungal symbionts of the North American grass Festuca arizonica |
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Authors: | Z.-q. An J.-S. Liu M. R. Siegel G. Bunge C. L. Schardl |
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Affiliation: | (1) Department of Plant Pathology, University of Kentucky, 40546 Lexington, KY, USA;(2) Department of Biology, New Mexico State University, 88003 Las Cruces, NM, USA |
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Abstract: | Summary Acremonium spp. endophytes are mutualistic fungal symbionts of many C3 grasses. They are anamorphs of Epichloë typhina (Clavicipitaceae) that have become strictly seedborne, heritable components of symbiotic units (symbiota). In order to test the possibility that endophytes may contribute to the genetic diversity of symbiota, a survey was conducted of plants from nine populations of Festuca arizonica in the southern Rocky Mountains. Sequence analysis of rRNA gene segments distinguished three Acremonium endophyte types. Parsimony analysis indicated at least two distinct evolutionary origins of the Acremonium endophytes from E. typhina. Either or both of these evolutionary lineages may have involved cospeciation with the host. |
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Keywords: | rRNA gene Epichloë typhina (Acremonium typhinum) Evolution Population Parsimony analysis |
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