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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #239968

Title: Genetic Dissection of Resistance in Soybean PI567516C to a Nematode Population Infecting cv. Hartwig

Author
item Arelli, Prakash

Submitted to: Soybean Research World Conference Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 5/5/2009
Publication Date: 8/1/2009
Citation: Arelli, P.R. 2009. Genetic Dissection of Resistance in Soybean PI567516C to a Nematode Population Infecting cv. Hartwig. Soybean Research World Conference Proceedings. 1:132-133.

Interpretive Summary:

Technical Abstract: Worldwide, soybean cyst nematode (SCN, Heterodera glycines Ichinohe) is the most destructive pathogen of soybean [Glycine max (L.) Merr.]. Crop losses are primarily mitigated by the use of resistant cultivars. Nematode populations are variable and have adapted to reproduce on resistant cultivars over time because resistance primarily traces to two soybean accessions, Plant Introduction (PI) 88788 and Peking. Soybean cultivar ‘Hartwig’, derived primarily from PI 437654, was released for its comprehensive resistance to most SCN populations. A virulent nematode population (LY1) was recently selected for its reproduction on Hartwig. LY1 nematode population infects currently known sources of resistance except soybean PI567516C. The objectives were to identify quantitative trait loci (QTLs) underlying resistance to LY1 SCN population in PI567516C, identify diagnostic DNA markers for resistance and confirm their utility for marker-assisted selection (MAS). Resistant soybean line PI567516C was crossed to susceptible cultivar ‘Hartwig’ to generate 105 F2:5 families. Inheritance of resistance included three major genes. QTLs were searched using simple sequence repeats (SSRs) covering 20 Linkage Groups (LGs) and three diagnostic markers, Satt592, Satt331, and Sat_274, were identified. These markers have a combined efficacy of 90% in identifying resistant lines to LY1 population in a F2:4 segregating population, generated by crossing a susceptible cultivar 5601T with PI567516C.