Submitted to: American Peanut Research and Education Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: June 13, 2000
Publication Date: December 1, 2000
Citation: Timper, P., Holbrook, Jr., C.C., Xue, H.Q. 2000. Nematode and tomato spotted wilt resistance in interspecific peanut breeding lines [abstract]. Proceedings of American Peanut Research and Education Society. 32:60. Technical Abstract: The peanut root-knot nematode, Meloidogyne arenaria, and Tomato spotted wilt virus (TSWV) can severely reduce peanut yields in the southeastern U.S. In preliminary tests, several families of Arachis hypogaea arising from a cross between Marc I and an interspecific genotype containing nematode-resistance genes introgressed from A. cardinasii showed resistance to both TSWV and M. arenaria. Our objective was to evaluate selected progeny from this cross for nematode resistance in the greenhouse and field. In the greenhouse, nematode eggs were extracted from the roots of peanut genotypes 40 days after inoculation with M. arenaria. There were eight replicate pots per genotype. Egg production on seven of the genotypes was 1/3rd to 1/10th that of the susceptible genotype. In the field, the average root-gall index from ten plants per plot was determined at digging (135 DAP). There were three replicate plots per genotype. Gall indices on 11 of the genotypes averaged < 2 on a scale of 1-5. These results are promising because several of the genotypes with good resistance to M. arenaria were also resistant to TSWV.