Abstract
We constructed and characterized a bacterial artificial chromosome (BAC) library for Epichlo ë festucae, a genetically tractable fungal plant mutualist. The 6144 clone library with an average insert size of 87 kb represents at least 18-fold coverage of the 29 Mb genome. We used the library to assemble a 110 kb contig spanning the putative ornithine decarboxylase ( odc) ortholog and subsequently expanded it to 228 kb with a single walking step in each direction. Furthermore, we evaluated conservation of microsynteny between E. festucae and some model filamentous fungi by comparing sequence available from a 43 kb region at the end of one BAC to publicly available fungal genome sequences. Orthologs to the 13 contiguous open reading frames (ORFs) identified in E. festucae are syntenic in Neurospora crassa and Magnaporthe grisea occurring in small sets of two, three or four colinear ORFs. This library is a valuable resource for research into traits important for the development and maintenance of a plant-fungus mutualistic symbiosis.
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