Global molecular surveillance reveals novel Fusarium head blight species and trichothecene toxin diversity.
To expand our knowledge of Fusarium head blight (FHB) pathogen and trichothecene toxin diversity, a global collection of 2100 isolates was screened for novel genetic variation, resulting in the identification of 16 phylogenetically divergent FHB isolates. The affinities and taxonomic status of these novel isolates were evaluated via phylogenetic analyses of multilocus DNA sequence data (13 genes; 16.3 kb/strain) together with analyses of their morphology, pathogenicity to wheat, and trichothecene toxin potential. Based on the results of these analyses, we formally describe two novel species (Fusarium vorosii and Fusarium gerlachii) within the Fusarium graminearum species complex (Fg complex), and provide the first published report of Fg complex isolates with either a nivalenol or 3-acetyldeoxynivalenol chemotype within the U.S. In addition, we describe a highly divergent population of F. graminearum from the Gulf Coast of the U.S., and divergent isolates of F. acaciae-mearnsii from Australia and South Africa.
Starkey
David E
DE
Microbial Genomics and Bioprocessing Research Unit, National Center for Agricultural Utilization Research, U.S. Department of Agriculture, Agricultural Research Service, Peoria, IL 61604, USA.
Ward
Todd J
TJ
Aoki
Takayuki
T
Gale
Liane R
LR
Kistler
H Corby
HC
Geiser
David M
DM
Suga
Haruhisa
H
Tóth
Beáta
B
Varga
János
J
O'Donnell
Kerry
K
D005670:Fusarium / Q000737:chemistry* / Q000235:genetics; D014644:Genetic Variation; D017720:Molecular Epidemiology; D010935:Plant Diseases / Q000382:microbiology; D014118:Toxins, Biological / Q000737:chemistry; D014255:Trichothecenes / Q000737:chemistry*; D014908:Triticum / Q000382:microbiology*
D014118:Toxins, Biological; D014255:Trichothecenes