Submitted to: American Peanut Research and Education Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 7/1/2002
Publication Date: 12/1/2002
Citation: Holbrook Jr, C.C., P. Timper, A. K. Culbreath. 2002. Development of breeding lines with resistance to tomato spotted wilt virus and the peanut root-knot nematode. Proc. Amer. Peanut Res. and Educ. Soc. 34:84-85. Interpretive Summary: not required
Technical Abstract: Tomato spotted wilt virus (TSWV) has become a major problem in peanut (Arachis hypogaea L.) production areas of the southern United States. The peanut root-knot nematode [Meloidogyne arenaria (Neal) Chitwood race 1] is also an important pathogen in this production area. Peanut cultivars are available that have resistance to TSWV or the peanut root-knot nematode (PRN), however, no cultivars are available that have resistance to both pathogens. The objective of this research was to identify peanut breeding lines that have resistance to both pathogens. Fifteen breeding lines were evaluated for 1 yr in a field test with high M. arenaria population densities and for 2 yr in a field test with little or no M. arenaria. This material was also evaluated in three greenhouse tests to measure nematode reproduction. In all field trials these breeding lines exhibited a level of resistance to TSWV at least a good as Georgia Green (the moderately resistant check), and significantly better than COAN (the susceptible check). In greenhouse trials these breeding lines supported significantly less nematode reproduction in comparison to Georgia Green (the susceptible check), but significantly more that COAN (the highly resistant check). In field trials with little or no M. arenaria, all breeding lines yielded similar to Georgia Green, and significantly higher than COAN. Breeding lines were identified which had significantly higher yield than either check cultivar in a field trial with high levels of pressure from both pathogens. These results document the development of breeding lines with moderate resistance to both pathogens.