Submitted to: Crop Science
Publication Type: Germplasm Release
Publication Acceptance Date: July 20, 2005
Publication Date: January 24, 2006
Citation: Anderson, W.F., Holbrook, C. C., Timper, P. 2006. Registration of root-knot nematode resistant peanut germplasm lines NR 0812 and NR 0817. Crop Science. 46:481-482. Interpretive Summary: Two peanut germplasm lines with very high root-knot nematode resistance, moderate tolerance to tomato spotted wilt virus, and moderate yield potential have been released for use by breeders. These lines are an upgrade in yield potential and virus tolerance for the Southeast from previous sources of resistance. Genes from a wild peanut species have been incorporated into these lines through traditional crossing. Marker-assisted selection using molecular marker genes was used for selection of plants in early generations. The pure lines were tested for resistance in the greenhouse and field. Root-knot nematode resistance in NR 0812 and NR 0817 equaled the most resistant cultivars and breeding material available.
Technical Abstract: NR 0812 and NR 0817 are runner type peanut lines with very high levels of resistance to the peanut root-knot nematode (Meloidogyne spp.). Marker assisted breeding was employed to select homozygous nematode resistance in early generations. These lines have resistance to M. arenaria and M. javonica comparable to the released cultivar COAN but have greater tomato-spotted wilt virus (TSWV) resistance and higher yield potential. NR 0812 and NR 0817 have semi-erect growth habit and flowers are not present on the main stem. The lines belong to A. hypogaea subspecies hypogaea var. hypogaea. Plants of NR 0812 are small to medium and NR 0817 medium in size. Main stems are not apparent at maturity. NR 0812 and NR 0817 have moderate maturity (130 -145 days from planting in South Georgia). NR 0812 and NR 0817 yields were less than commercial lines under no nematode pressure but were comparable to Georgia Green in nematode infested fields. However, yields were much higher than equally resistant cultivar COAN. NR 0812 and NR 0817 produce thin two-seeded pods. Seed have pink seed coats. Grade data indicated a shelling percentage of 76%, and 56 g 100-1 seed. The size of seed fit the medium runner grade market. Seed of NR 0812 are somewhat blocky, but NR 0817 seed are well formed and size comparable to the medium runner grade market. The oil chemistry of NR 0817 indicates a middle oleic fatty acid level (3:1 oleic:linoleic).