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Abstract Detail

MSA - Systematics/Evolution

Mejia, Luis C. [1], Castlebury, Lisa A. [2], Rossman, Amy Y. [2], White, Jr., James F. [1].

Phylogeny, host-associations, and geographic distribution of the genus Cryptosporella (Gnomoniaceae, Diaporthales, Ascomycota).

Species of the genus Cryptosporella occur on branches of hardwood trees in Betulaceae, Tiliaceae, and Ulmaceae in Europe and North America. Species in this genus are microscopic and are within the most abundantly isolated on surveys of endophytes from trees of the Betulaceae. Species of Cryptosporella appear to have a limited host range and geographic distribution. Here we use morphological and molecular data to define the genus Cryptosporella and to infer the phylogeny of its species. Specimens analyzed were collected in North, Central, and South America, Europe, and Asia. Data used for morphological comparisons included arrangement of perithecia and asci and ascospore size. Molecular data included DNA sequences from multiple genes (i.e. β-tubulin, ITS, LSU, RPB2, and Tef-1α). The resulting multigene phylogeny and morphological data suggest the recognition of at least eight new species, increasing the total number of species on this genus to 17, and that this genus has speciated primarily on Betulaceae. Fourteen species occur exclusively on Betulaceae. The host range of most species is very narrow with nine species limited to a single host species and seven species occurring on a few usually congeneric hosts species. Furthermore the data suggest a geographic structure among Cryptosporella species, potentially due to speciation events resulting from host jumps to both distantly and more closely related host species within the same geographic area. The known distribution range of Cryptosporella is expanded to Central and South America.

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1 - Rutgers University, Plant Biology and Pathology, 59 Dudley Rd., Foran Hall, New Brunswick, NJ, 08901, USA
2 - United States Department of Agriculture, Agricultural Research Service, Systematic Mycology and Microbiology Laboratory, 10300 Baltimore Ave., Bldg. 011A, Beltsville, MD, 20705, USA

host specificity

Presentation Type: Oral Paper:Papers for Topics
Session: 29
Location: Cottonwood D/Snowbird Center
Date: Monday, July 27th, 2009
Time: 4:15 PM
Number: 29003
Abstract ID:196