Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/15/2008
Publication Date: 4/15/2008
Citation: Holbrook Jr, C.C., Timper, P., Culbreath, A.K., Kvien, C.K. 2008. Registration of 'Tifguard' Peanut. Journal of Plant Registrations. 2:92-94. Interpretive Summary: The peanut root-knot nematode and tomato spotted wilt virus (TSWV) are diseases of peanut that result in large yield losses in the southeastern United States. Peanut varieties are available that have resistance to either the peanut root-knot nematode or TSWV, but no varieties are available that have resistance to both pathogens. 'Tifguard' is a new peanut variety that is being jointly release by the USDA Agricultural Research Service, and the College of Agriculture & Environmental Sciences of the University of Georgia. Tifguard has high yield and excellent resistance to the peanut root-knot nematode and TSWV. This variety should be particularly valuable for peanut growers who have to deal with both diseases.
Technical Abstract: 'Tifguard' (Reg. No. , PI ) is a runner-type peanut (Arachis hypogaea L. subsp. hypogaea var. hypogaea) cultivar that was released by the USDA-ARS and the Georgia Agricultural Experiment Stations in 2007. It was developed at the University of Georgia Coastal Plain Experiment Station, Tifton, GA, and was tested under the experimental designations C724-19-15. Peanut cultivars are available that have high resistance to the peanut root-knot nematode [Meloidogyne arenaria (Neal) Chitwood race 1] or Tomato spotted wilt Tospovirus (TSWV), the cause of tomato spotted wilt. However, no cultivars exist that have resistance to both pathogens. The objective of this research was to combine resistance to both pathogens in a single cultivar. Breeding populations were developed by hybridizing the TSWV resistant cultivar, 'C-99R' with the nematode resistant cultivar, 'COAN'. Selection for nematode resistance was conducted using standard greenhouse screening techniques. Selection for TSWV resistance was conducted in the field with natural virus infection. A breeding line (C724-19-15) was selected that had high resistance to both pathogens. Tifguard exhibited higher resistance to TSWV and higher yield than standard check cultivars when grown in fields with little or no nematode pressure. Because of its high level of resistance to both TSWV and M. arenaria, Tifguard had significantly higher yield than all others entries when grown in two locations with high pressure from both pathogens. This cultivar should be valuable for peanut growers who have to deal with both pathogens.