Registration of ‘Tifguard’ Peanut

Abstract

‘Tifguard’ (Reg. No. CV‐101, PI 651853) is a runner‐type peanut (Arachis hypogaea L. subsp. hypogaea var. hypogaea) cultivar released by the USDA‐ARS and the Georgia Agricultural Experiment Stations in 2007. Tifguard was developed at the University of Georgia Coastal Plain Experiment Station, Tifton, GA. Peanut cultivars are available that have high resistance to the peanut root‐knot nematode [Meloidogyne arenaria (Neal) Chitwood race 1] or spotted wilt caused by tomato spotted wilt tospovirus (TSWV). However, no cultivars exist that have resistance to both pathogens. Our research objective was to combine resistance to both pathogens in a single cultivar. Breeding populations were developed by hybridizing the TSWV‐resistant ‘C‐99R’ with the nematode‐resistant ‘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.

Influence of Temperature on Susceptibility of CVS. Tifguard and Georgia-06G Peanut to Meloidogyne arenaria

“…Tifguard was reported to be highly resistant to M. arenaria infection (Holbrook et al, 2008). Although nematode development occurred faster in Georgia-06G, there was only a small rate of development at 34°C in Tifguard.…”

“…The breeding population was generated by hybridizing C-99R (Gorbet and Shokes, 2002), a peanut cultivar with good field resistance to TSWV (Wells et al, 2002) with COAN. Tifguard was reported to have a high level of resistance to both TSWV and M. arenaria (Holbrook et al, 2008).…”

“…Neither of these two cultivars was considered for planting in the southeastern U.S. because of the prevalence and severity of tomato spotted wilt virus (TSWV) and other important fungal diseases in this peanut growing region (Holbrook et al, 2008). In 2008, a runner-type peanut cultivar (Arachis hypogaea L. subsp.…”

“…hypogaea var. hypogaea), Tifguard was released by the USDA-ARS and the Georgia Agricultural Experiment Station (Holbrook et al, 2008). The breeding population was generated by hybridizing C-99R (Gorbet and Shokes, 2002), a peanut cultivar with good field resistance to TSWV (Wells et al, 2002) with COAN.…”

Phenotyping Peanut Genotypes for Drought Tolerance

“…Both locations have Tifton sandy loam soil (fine loamy, kaolinitic, thermic Plintic Kandiudults) composed of 87% sand, 7% silt, 6% clay and ,1% organic matter. Seven peanut genotypes, namely: Tifguard (Holbrook et al, 2008), Tifrunner Culbreath, 2007), C76-16, Florida-07 (Gorbet andTillman, 2008), accession PI 158839 from the peanut core collection (Holbrook et al, 1993), NC 3033 (Beute et al, 1976) and A72 were provided by the peanut programs of the United States Department of Agriculture -Agricultural Research Service (USDA-ARS) Crop Genetics and Breeding Research in Tifton, GA and University of Georgia (UGA) Tifton Campus. The first six genotypes were tested for drought tolerance and aflatoxin resistance while A72, formerly identified as aflatoxin susceptible, served as the susceptible check.…”