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Variation Among Isolates Of Fusarium Graminearum Associated With Fusarium Head Blight In North Carolina, Scott L. Walker, Steven Leath, Winston M. Hagler Jr., J. Paul Murphy
Variation Among Isolates Of Fusarium Graminearum Associated With Fusarium Head Blight In North Carolina, Scott L. Walker, Steven Leath, Winston M. Hagler Jr., J. Paul Murphy
Steven Leath
Fusarium head blight (FHB) can reduce yield of wheat and decrease the value of harvested grain by accumulation of detrimental toxins. Understanding the variability of the fungal population associated with infection could improve disease control strategies. Sixty-six isolates of Fusarium graminearum associated with FHB were collected in North Carolina and tested for in vitro growth rate, in vitro production of deoxynivalenol (DON) and zearalenone, and pathogenicity on three cultivars of soft red winter wheat. Significant differences among isolates were found for all three traits. Randomly Amplified Polymorphic DNA (RAPD) analysis revealed high levels of genotypic diversity among isolates. Isolates of …
Selection For Resistance And Tolerance To Oat Mosaic Virus And Oat Golden Stripe Virus In Hexaploid Oats, Scott L. Walker, Steven Leath, J. Paul Murphy, Steven A. Lommel
Selection For Resistance And Tolerance To Oat Mosaic Virus And Oat Golden Stripe Virus In Hexaploid Oats, Scott L. Walker, Steven Leath, J. Paul Murphy, Steven A. Lommel
Steven Leath
Coker 716, a hexaploid oat cultivar resistant to both oat mosaic virus (OMV) and oat golden stripe virus (OGSV) was crossed to three susceptible cultivars (Brooks, Madison, and Tech) to form three individual populations. Individual breeding lines were derived from each cross in the F2 generation and tested in plots consisting of equally spaced individual hills in OMV- and OGSV-infested soils and non-infested soils to evaluate resistance and yield loss of individual lines. Foliar symptoms, harvest index, and yield loss were examined as selection criteria for resistant genotypes. The study was conducted over 2 years at two North Carolina locations …