Submitted to: American Society of Agronomy Meetings
Publication Type: Abstract Only
Publication Acceptance Date: May 20, 2005
Publication Date: November 6, 2005
Citation: Arelli, P.R., Young, L.D. 2005. Inheritance of resistance in soybean pi 567516c to ly1 nematode population infecting cv. hartwig. American Society of Agronomy Meetings. Vol 68: p 212. Technical Abstract: Worldwide, soybean cyst nematode (SCN: Heterodera glycines Ichinohe) is one of the most destructive pathogens on soybean [Glycine max (L.) Merr.]. In the USA, yield losses in 2003 were estimated to be nearly a billion dollars. Crop losses are primarily reduced by the use of resistant cultivars combined with crop rotation. Most resistant cultivars trace their resistance to 'Peking' and/or Plant Introduction (PI) 88788. Widespread use of these resistance sources has caused major shifts in nematode populations. Recently, cv. Hartwig was released which has comprehensive resistance to most nematode populations. Virulent nematode population LY1 was recently selected for reproduction on Hartwig. LY1 nematode population infects currently known sources of resistance except PI 567516C. Average numbers of SCN females obtained on PI 567516C and Hartwig were 7 and 146, respectively. We determined the inheritance of resistance in PI 567516C to the LY1 population. Soybean PI 567516C was crossed to susceptible Hartwig, and 105 F2:5 progenies were bioassayed for reaction to LY1. Resistance was conditioned by three major genes (Rhg rhg rhg). Chi-square value was 0.15 and probability was at the 1% level. This information will be useful to soybean breeders for developing resistant cultivars to nematode populations that infect Hartwig.