Genetic relationships among populations of Gibberella zeae from barley, wheat, potato, and sugar beet in the upper midwest of the United States

Article


Burlakoti, R. R., Ali, S., Secor, G. A., Neate, S. M., McMullen, M. P. and Adhikari, T. B.. 2008. "Genetic relationships among populations of Gibberella zeae from barley, wheat, potato, and sugar beet in the upper midwest of the United States." Phytopathology: International Journal of the American Phytopathological Society. 98 (9), pp. 969-976. https://doi.org/10.1094/PHYTO-98-9-0969
Article Title

Genetic relationships among populations of Gibberella zeae from barley, wheat, potato, and sugar beet in the upper midwest of the United States

ERA Journal ID2639
Article CategoryArticle
AuthorsBurlakoti, R. R. (Author), Ali, S. (Author), Secor, G. A. (Author), Neate, S. M. (Author), McMullen, M. P. (Author) and Adhikari, T. B. (Author)
Journal TitlePhytopathology: International Journal of the American Phytopathological Society
Journal Citation98 (9), pp. 969-976
Number of Pages8
Year2008
PublisherAmerican Phytopathological Society
Place of PublicationSt. Paul, MN. United States
ISSN0031-949X
1943-7684
Digital Object Identifier (DOI)https://doi.org/10.1094/PHYTO-98-9-0969
Abstract

Gibberella zeae, a causal agent of Fusarium head blight (FHB) in wheat and barley, is one of the most economically harmful pathogens of cereals in the United States. In recent years, the known host range of G. zeae has also expanded to noncereal crops. However, there is a lack of information on the population genetic structure of G. zeae associated with noncereal crops and across wheat cultivars. To test the hypothesis that G. zeae populations sampled from barley, wheat, potato, and sugar beet in the Upper Midwest of the United States are not mixtures of species or G. zeae clades, we analyzed sequence data of G. zeae, and confirmed that all populations studied were present in the same clade of G. zeae. Ten variable number tandem repeat (VNTR) markers were used to determine the genetic structure of G. zeae from the four crop populations. To examine the effect of wheat cultivars on the pathogen populations, 227 strains were sampled from 10 subpopulations according to wheat cultivar types. The VNTR markers also were used to analyze the genetic structure of these subpopulations. In all populations, gene (H = 0.453 to 0.612) and genotype diversity (GD = >0.984) were high. There was little or no indication of linkage disequilibrium (LD) in all G. zeae populations and subpopulations. In addition, high gene flow (Nm) values were observed between cereal and noncereal populations (Nm = 10.69) and between FHB resistant and susceptible wheat cultivar subpopulations (Nm = 16.072), suggesting low population differentiation of G. zeae in this region. Analysis of molecular variance also revealed high genetic variation (>80%) among individuals within populations and subpopulations. However, low genetic variation (<5%) was observed between cereal and noncereal populations and between resistant and susceptible wheat subpopulations. Overall, these results suggest that the populations or subpopulations are likely a single large population of G. zeae affecting crops in the upper Midwest of the United States.

Keywordsbeta vulgaris; Fusarium graminearum; Hordeum vulgare; population genetics; Solanum tuberosum; Triticum aestivum
ANZSRC Field of Research 2020300409. Crop and pasture protection (incl. pests, diseases and weeds)
300110. Transgenesis
310599. Genetics not elsewhere classified
Public Notes

© 2008 The American Phytopathological Society. Open Access journal. Published version deposited in accordance with the copyright policy of the publisher.

Byline AffiliationsNorth Dakota State University, United States
Institution of OriginUniversity of Southern Queensland
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