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Title: Nematode resistance in arachis illustrates the value of wild species

item Holbrook, Carl - Corley
item CHU, Y - University Of Georgia
item OZIAS-AKINS, P - University Of Georgia

Submitted to: American Peanut Research and Education Society Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 4/15/2011
Publication Date: 12/15/2011
Citation: Holbrook Jr, C.C., Chu, Y., Ozias-Akins, P. 2011. Nematode resistance in arachis illustrates the value of wild species. Proceedings of American Peanut Research and Education Society. 43:89-90.

Interpretive Summary: not required

Technical Abstract: The peanut root-knot nematode, Meloidogyne arenaria, causes significant economic losses in many peanut production areas of the World. A recent estimate put the cost of this pest to the U.S. peanut industry at $42 million annually. Chemicals for control of this pest are becoming increasingly limited, and the development of peanut cultivars with resistance is desirable. Although the entire U.S. germplasm collection of Arachis hypogaea has been screened, only moderate levels of resistance have been identified. Fortunately, very high levels of resistance exists in Arachis spp. This resistance has been introgressed into A, hypogaea by research groups in Texas and North Carolina using both a hexaploid and a diploid pathway and resulting in releases of highly resistant germplasm. Some of this germplasm was then used by the Texas group to develop COAN the first peanut cultivar with resistance to M arenaria. This resistance is conditioned by a single dominant gene and confers near immunity to the nematode. COAN, and the subsequently released nematode-resistant cultivar, NemaTAM are both highly susceptible to tomato spotted wilt virus (TSWV), and thus are not acceptable for production in the southeastern peanut production region. We crossed COAN with the TSWV-resistant cultivar C-99R to develop Tifguard a cultivar with high levels of resistance to both the peanut root-knot nematode and TSWV.