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Abstract Detail


MSA - Systematics/Evolution

Hirooka, Yuuri [1], Rossman, Amy Y. [2], Chaverri, Priscila [3].

Systematics of the genus Nectria based on a six-gene phylogeny.

The genus Nectria is characterized by red, fleshy, warted perithecia that become cupulate when dry, and sporodochial conidiomata in Tubercularia and pycnidial anamorphs in Gyrostroma and Zythiostroma. Nectria is the type of the family Nectriaceae currently considered to include 21 genera and at least 200 species, many of which are plant pathogens, especially on hardwood tress. To understand the phylogeny of Nectria and determine if Nectria species with Gyrostroma and Zythiostroma anamorphs are congeneric with those having a Tubercularia anamorph, we have examined specimens and cultures of Nectria from around the world. In addition, we constructed phylogenies based on sequences from six genes (ITS, LSU, ß-tubulin, TEF, ACT, RPB1). Based on these results Nectria is paraphyletic with two major clades: (1) species with Tubercularia anamorphs, including the type species Nectria cinnabarina; and (2) species with Gyrostroma and Zythiostroma anamorphs. Nectria cinnabarina was determined to comprise at least four phylogenetic lineages. Nectria xanthoxyli in the Gyrostroma clade is represented by two distinct lineages as are N. cucurbitula and N. aquifolii. New species in each clade were discovered. This study concludes that Nectria s. str. is restricted to N. cinnabarina and species having a Tubercularia anamorph. For species having pycnidial anamorphs (Gyrostroma, Zythiostroma), the next available generic name is Pleonectria.


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Related Links:
Home page of Yuuri Hirooka


1 - United States Department of Agriculture, Agricultural Research Service, Systematic Mycology & Microbiology Laboratory, Rm. 330, B011A, 10300 Baltimore Ave., Beltsville, MD, 20705, 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 - University of Maryland, Department of Plant Sciences and Landscape Architecture, 2112 Plant Sciences Building, University of Maryland, College Park, MD, 20742, USA

Keywords:
Nectria.

Presentation Type: Oral Paper:Papers for Topics
Session: 53
Location: Cottonwood A/Snowbird Center
Date: Tuesday, July 28th, 2009
Time: 2:15 PM
Number: 53004
Abstract ID:261


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