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33 POSTER SESSION 6 (Abstr. 513-529) Fruits/Nuts/Berries: Breeding and Genetics
Oregon Agricultural Experiment Station Technical Paper no. 10186. Salaries and research support provided by the Oregon Hazelnut Commission and State and Hatch Act Funds. Mention of a trademark or proprietary product does not imply
present throughout the entire hazelnut-producing area in Oregon. GERMPLASM IMPROVEMENT Oregon State University's Hazelnut Breeding Program run by Dr. Shawn Mehlenbacher responded to the threat of EFB by developing EFB-resistant cultivars. The breeding
scouting, pruning, and spraying to control this disease ( Mehlenbacher, 1995 ). The resistance from ‘Gasaway’, an obsolete pollinizer ( Mehlenbacher et al., 1991 ), has been extensively used in the hazelnut breeding program at Oregon State University (OSU
The European hazelnut ( Corylus avellana L.) is one of the world's major nut crops. Its geographic distribution extends from the Mediterranean coast of North Africa northward to the British Isles and the Scandinavian Peninsula, and eastward to
-term management solution ( Julian et al., 2008 , 2009 ; Thompson et al., 1996 ). Breeding for EFB resistance is now a major objective of hazelnut breeding programs in the United States ( Mehlenbacher, 1994 ; Molnar et al., 2005a ). Recent taxonomic studies
North America where hazelnuts are now grown as well as those regions suitable for future production. Therefore, the identification and development of cultivars resistant to the disease is a necessary objective of hazelnut breeding programs in North
‘Gasaway’, controlled by a dominant allele at a single locus ( Mehlenbacher et al., 1991 ), has been extensively used in the hazelnut breeding program at OSU. Most advanced selections and recently released cultivars and pollenizers carry ‘Gasaway
Eastern filbert blight is a serious threat to hazelnut (Corylus avellana) production in the Pacific NW. Susceptible genotypes inoculated with the causal fungus, Anisogramma anomala, require 16 to 28 months of incubation to develop symptoms. A rapid and accurate screening system was needed to identify resistant genotypes in the OSU hazelnut breeding program, particularly in progenies segregating 1:1 for a single dominant resistance gene from the variety `Gasaway'. An indirect enzyme-linked immunosorbant assay (ELISA) system was developed using polyclonal antibodies obtained by injecting New Zealand rabbits with antigens from pure cultures of A. anomala. The antiserum produced a positive reaction to the fungus in 1000-fold dilutions of the extracts from infected hazelnut tissue but did not react to 10-fold dilutions of healthy tissue in indirect ELISA.
107 POSTER SESSION (Abstr. 305–315) Breeding and Genetics–Fruits/Nuts