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This article in CS

  1. Vol. 46 No. 1, p. 224-233
     
    Received: Dec 23, 2004


    * Corresponding author(s): SleperD@missouri.edu
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doi:10.2135/cropsci2004.0757

Quantitative Trait Loci underlying Resistance to Three Soybean Cyst Nematode Populations in Soybean PI 404198A

  1. B. Guoa,
  2. D. A. Sleper *b,
  3. H. T. Nguyena,
  4. P. R. Arellic and
  5. J. G. Shannona
  1. a Division of Plant Science and National Center for Soybean Biotechnology, University of Missouri-Columbia, Columbia, MO 65211
    b Division of Plant Science, 271-F Life Sciences Center, University of Missouri-Columbia, Columbia, MO 65211-7310
    c USDA-ARS-MSA, 605 Airways Blvd., Jackson, TN 38301

Abstract

Soybean cyst nematode (SCN) (Heterodera glycines Ichinohe) is a major pest of soybean [Glycine max (L.) Merr.] in the USA. Soybean plant introduction (PI) 404198A is one of the newly identified sources that can provide a broad spectrum of resistance to SCN. The objective of this study was to identify quantitative trait loci (QTL) associated with resistance to SCN races 1, 2, and 5 in PI 404198A. Linkage groups (LGs) G and A2 were found to be associated with resistance to race 1. QTL on LG G was located on the Satt309-Satt688 region, and it explained a larger proportion of the total variation (20.2%). QTL on LG A2 was located at the Satt424-Satt632-Sat_406 region, and it accounted for a smaller proportion (9%). LGs G and B1 were shown to be associated with resistance to race 2. QTL on LG G was located on the Satt688-Satt309-Satt163 region, and it explained 12.5% of the total variation. Molecular marker Satt453 on LG B1 was found to be associated with resistance to race 2, and it explained 11% of the total variation. LGs G, B1, and N were found to be associated with resistance to race 5. QTL on LG G was located on the Satt688-Satt309-Satt163 region, and it explained 6.3% of the total variation. Molecular marker Satt453 on LG B1 was found to be associated with resistance to race 5, and it explained a larger proportion of the total variation (13%). QTL on LG N was mapped on the Satt584-Sat_280-Satt549, and it explained 9.5% of the total variation. In conclusion, soybean PI 404198A may carry rhg1 on LG G, Rhg4 on LG A2, and a QTL on LG B1. Further studies are needed to lend credibility for QTL on LG N.

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