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Monsanto Co., 700 Chesterfield Parkway N., St Louis, MO 63198
Dep. of Plant and Soil Science, Molecular Science Program, Southern Illinois Univ., Carbondale, IL 62091
* Corresponding author (GA4082{at}SIUCVMB.SIU.EDU).
Severe losses of soybean [Glycine max (L.) Merr.] grain yield occur as a result of the disease sudden death syndrome (SDS), caused by Fusarium solani (Mart.) Sacc. f. sp. phaseoli (Burk.) Snyd. & Hans., type A. Selection for resistance to SDS is currently the most efficient means of yield protection. This study was undertaken within adapted soybean germplasm to identify and characterize loci underlying useful field resistance to SDS. One hundred eleven polymorphic DNA markers were compared with SDS disease response among 100 recombinant inbred lines derived from a cross between a durably SDS resistant cultivar, ‘Forrest’, and a SDS susceptible cultivar, ‘Essex’. SDS disease incidence (DI) and disease severity (DS) were determined in replicated, F. solani infested field-test sites during 4 yr encompassing five locations. Four separate chromosomal segments were strongly associated with mean SDS DI across 5 locations (P < 0.001). In a previous report using the same genetic materials tested in the same environments two of these quantitative trait loci (QTL) had been identified. With the further analysis with 40 additional markers, two more QTL were detected. The two new QTL were stably associated with SDS resistance within each of five F. solani infested locations (P < 0.007). These two loci were identified by RAPD markers OI03450 and OG13490 and by OE04450 and OE021000. The alleles that conferred resistance were both derived from Forrest. Jointly, the four QTL accounted for about 65% of total phenotypic variability in mean DI and 50% in mean DS. DNA markers can be used to define alleles conferring resistance to SDS. Selection for the SDS resistance QTL may allow efficient selection of resistant genotypes with good yield potential in F. solani infested fields.
Received for publication October 30, 1995.
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