MSA - Systematics/Evolution
Dixon, Linley J. , Castlebury, Lisa A. , Glynn, Neil C. , Comstock, Jack C. .
Systematics of Rust and Associated Fungi from Sugarcane.
The systematic positions of rust pathogens infecting sugarcane (a complex hybrid of Saccharum spp.) were determined using independent and combined sequence data. Rust specimens on sugarcane were sent from 175 locations in 25 countries. In all collections except one, the morphology and nuclear large subunit (nLSU) sequence data matched that of Puccinia kuehnii or P. melanocephala, the orange and brown rust pathogens of sugarcane, respectively. However, nLSU sequences from one collection were distinct from all reported rust sequences available in Genbank from sugarcane and other hosts. The spore morphology of this collection is also distinct from any rust species previously reported on sugarcane and this collection potentially represents an undescribed sugarcane pathogen. Phylogenetic analyses of nuclear ribosomal DNA (rDNA) and beta-tubulin partial gene sequences place this rust closest to P. physalidis and P. glechomatis. In addition, two different rust-associated mycoparasites were observed in these collections and identified as Sphaerellopsis filum and Hendersonia uredinophyla based on their morphology and rDNA sequences. A phylogenetic placement of S. filum and H. uredinophyla in the Pleosporales is presented. These fungi should be evaluated for their use as biological control agents in conjunction with fungicides for management of sugarcane rust diseases.
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1 - United States Department of Agrictulture, Agriculture Research Service, Systematic Mycology and Microbiology Laboratory, Rm 304, Bldg 011A, BARC-West, 10300 Baltimore Ave., Beltsville, MD, 20705-2350, USA
2 - United States Department of Agriculture, Agricultural Research Service, Systematic Mycology and Microbiology Laboratory, 10300 Baltimore Ave., Bldg. 011A, Beltsville, MD, 20705, USA
3 - United States Department of Agriculture, Agriculture Research Service, Sugarcane Field Station, 12990 U.S. Hwy 441 N. , Canal Point, FL, 33438, USA
Presentation Type: Poster:Posters for Topics
Location: Event Tent/Cliff Lodge
Date: Tuesday, July 28th, 2009
Time: 5:30 PM