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CROP BREEDING, GENETICS & CYTOLOGY

Pedigree Analysis of a Major QTL Conditioning Soybean Resistance to Southern Root-Knot Nematode

^a Dep. of Crop and Soil Sci., Univ. of Georgia, Center for Applied Genetic Technologies, 111 Riverbend Road, Athens, GA 30602
^b Dep. of Plant Pathology, Univ. of Georgia, 2106 Miller Plant Sciences Building, Athens, GA 30602

^* Corresponding author (rboerma{at}uga.edu).

The southern root-knot nematode [Meloidogyne incognita (Kofoid and White) Chitwood] (Mi) is a serious pest of soybean [Glycine max (L.) Merr.] in the southern USA. Many soybean cultivars with Mi resistance and high productivity have been developed in the USA during the past few decades. DNA markers have been used to identify a major quantitative trait locus (QTL) near the top of Linkage Group O (LG-O) conferring resistance to Mi. The objectives of this study were to determine the frequency of elite Mi-resistant cultivars that inherited the major Mi resistance QTL on LG-O and determine the ancestral source of the Mi-resistance allele at this QTL. Forty-eight soybean lines, including ancestral, Mi-susceptible, and Mi-resistant genotypes were analyzed at six simple sequence repeat (SSR) loci that flank the major Mi QTL on LG-O. Codescent analysis of markers and phenotypes across six cycles of breeding showed that Mi-resistant cultivars inherited a 200-bp band at Satt358 and a 238-bp band at Sat_132 from ‘Palmetto’. The tight linkage of both Satt358 and Sat_132 to the Mi QTL on LG-O indicates that selection for the Mi-resistant parent's allele at either of these markers should be highly effective in identifying Mi-resistant plants or lines.

Abbreviations: EDTA, ethylenediamine tetraacetic acid • LG-O, Linkage Group O • Mi, Meloidogyne incognita • PCR, polymerase chain reaction • QTL, quantitative trait locus/loci • SSR, simple sequence repeat

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THIS ISSUE IN CROP SCIENCE

Crop Science 2004 44: 707-710. [Full Text]  

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