Articles
New sources of eastern filbert blight resistance from Turkey map to linkage group 2
Article number
1379_12
Pages
81 – 86
Language
English
Abstract
The Willamette Valley of Oregon has a 100+ year history of hazelnut production and accounts for 99% of the United States yield.
Hazelnut production is threatened by eastern filbert blight (EFB) caused by Anisogramma anomala (Peck) E. Müller.
The fungus was accidentally introduced in the early 1960s from the eastern United States, where it is endemic on the native American hazelnut (Corylus americana). In Oregon and Washington, it appears to be a single isolate (Pscheidt et al., 2022). Resistant cultivars from Oregon State University are protected by a single dominant allele from the obsolete pollinizer Gasaway. Although these cultivars remain resistant in the Willamette Valley, Gasaway resistance has been overcome by other A. anomala isolates in New Jersey, USA. OSU is investigating new sources of resistance to mitigate the potential damage from a second introduction of A. anomala or a genetic change in the Oregon isolate that allows it to overcome Gasaway resistance.
Three selections of Turkish origin (OSU 1229.082, OSU 1240.131, and OSU 1289.028) showed no signs of disease after exposure to EFB under field conditions and subsequent structure inoculation.
The three resistant selections were used as parents in controlled pollinations with susceptible parent Sacajawea. None of the progenies segregated 1:1 (resistant:susceptible) for disease response as expected.
Correlation with simple sequence repeat (SSR) markers indicated that the resistance locus was on linkage group 2, where three other resistance sources have been assigned.
Linkage maps placed the resistance locus near SSR marker MS0140.02. The new resistance sources will be useful in breeding new EFB-resistant cultivars, singly or pyramided.
Hazelnut production is threatened by eastern filbert blight (EFB) caused by Anisogramma anomala (Peck) E. Müller.
The fungus was accidentally introduced in the early 1960s from the eastern United States, where it is endemic on the native American hazelnut (Corylus americana). In Oregon and Washington, it appears to be a single isolate (Pscheidt et al., 2022). Resistant cultivars from Oregon State University are protected by a single dominant allele from the obsolete pollinizer Gasaway. Although these cultivars remain resistant in the Willamette Valley, Gasaway resistance has been overcome by other A. anomala isolates in New Jersey, USA. OSU is investigating new sources of resistance to mitigate the potential damage from a second introduction of A. anomala or a genetic change in the Oregon isolate that allows it to overcome Gasaway resistance.
Three selections of Turkish origin (OSU 1229.082, OSU 1240.131, and OSU 1289.028) showed no signs of disease after exposure to EFB under field conditions and subsequent structure inoculation.
The three resistant selections were used as parents in controlled pollinations with susceptible parent Sacajawea. None of the progenies segregated 1:1 (resistant:susceptible) for disease response as expected.
Correlation with simple sequence repeat (SSR) markers indicated that the resistance locus was on linkage group 2, where three other resistance sources have been assigned.
Linkage maps placed the resistance locus near SSR marker MS0140.02. The new resistance sources will be useful in breeding new EFB-resistant cultivars, singly or pyramided.
Publication
Authors
B. Heilsnis, S.A. Mehlenbacher
Keywords
Corylus avellana, Anisogramma anomala, hazelnut, disease resistance
Groups involved
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