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Journal of Heredity Advance Access originally published online on July 9, 2009
Journal of Heredity 2009 100(6):777-783; doi:10.1093/jhered/esp042
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Published by Oxford University Press 2009.

Original Articles

Genetic Mapping of Resistance to Phomopsis Seed Decay in the Soybean Breeding Line MO/PSD-0259 (PI562694) and Plant Introduction 80837

Eric W. Jackson, Chunda Feng, Patrick Fenn, and Pengyin Chen

From USDA ARS Small Grains and Potato Germplasm Unit, 1691 S. 2700 W. Aberdeen, ID 83210 (Jackson)
Department of Plant Pathology, University of Arkansas, 217 Plant Sciences Bldg., Fayetteville, AR 72701 (Feng); Deceased (Fenn)
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 115 Plant Sciences Building, Fayetteville, AR 72701 (Chen)

Address correspondence to E. W. Jackson at the address above, or e-mail: eric.jackson{at}ars.usda.gov.

Resistance to Phomopsis seed decay (PSD) in soybean (Glycine max [L.] Merr.) could provide dependable control of this important disease that affects seed quality. Studies have shown that single dominant genes that are allelomorphically different confer low levels of PSD in MO/PSD-0259 and PI 80837. The objectives of this research were to identify simple sequence repeat (SSR) markers linked to genes for PSD resistance in PI 80837 and MO/PSD-0259 and to associate the resistance genes to known linkage groups. Crosses were made between the PSD-susceptible cultivar Agripro 350 and each of the resistant lines MO/PSD-0259 and PI 80837. F2 populations from each cross were grown and inoculated in the field. Individual plant reactions were characterized by determining the levels of seed infection, and DNA of F2 plants was extracted for SSR analysis and mapping. F2 segregation data showed that different single dominant genes condition PSD resistance in MO/PSD-0259 and PI 80837. Resistance in PI 80837 was linked to Sat_177 (4.3 cM) and Sat_342 (15.8 cM) on molecular linkage group (MLG) B2. In MO/PSD-0259, resistance was linked to Sat_317 (5.9 cM) and Sat_120 (12.7 cM) on MLG F. These data support work by Berger and Minor (Berger RD, Minor HC. 1999. An restriction fragment length polymorphism (RFLP) marker associated with resistance to Phomopsis seed decay in soybean PI 417479. Crop Sci 39:800–805.) in which PSD resistance in PI 417479, the resistant parent used to develop MO/PSD-0259, was associated with RFLP marker A708 on MLG F. These SSR markers should be useful in selection for resistant genotypes in breeding programs.

Key Words: genomics and gene mapping • quantitative genetics and Mendelian inheritance

Corresponding Editor: Reid G. Palmer

Received February 6, 2008
Revised December 30, 2008
Accepted June 1, 2009


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