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Mapping and confirmation of a new sudden death syndrome resistance QTL on linkage group D2 from the soybean genotypes PI 567374 and 'Ripley'
- The use of resistant cultivars is the most effective method for controlling sudden death syndrome (SDS), caused by Fusarium solani f. sp. glycines (FSG) (syn. Fusarium virguliforme Akoi, O'Donnell, Homma and Lattanzi), in soybean [Glycine max (L.) Merr.]. Previous research has led to the identification of soybean genotypes with partial resistance to SDS and quantitative trait loci (QTL) controlling this resistance. The objective of our study was to map QTL conferring SDS resistance in populations developed from the crosses Ripley x Spencer (RxS-1) and PI 567374 x Omaha (PxO-1). Both Ripley and PI 567374 have partial resistance to SDS and Spencer and Omaha are susceptible. The RxS-1 population was evaluated for SDS resistance in three field environments and the PxO-1 population was greenhouse evaluated. Three SDS resistance QTL were mapped in the RxS-1 population and two in the PxO-1 population. One resistance QTL was mapped to the same location on linkage group (LG) D2 in both backgrounds. This QTL was then tested in a population of F₂ plants developed through one backcross (BC1F₂) in the PI 567374 source and in a population of F₈ plants derived from a heterozygous F₅ plant in the Ripley source. The LG D2 QTL was also significant in confirmation populations in both resistant backgrounds. Since none of the SDS resistance QTL identified in the RxS-1 or PxO-1 populations mapped to previously reported SDS resistance regions, these new QTL should be useful sources of SDS resistance for soybean breeders.
Farias Neto, Austeclinio L. de , Hashmi, Rizwan , Schmidt, Michael , Carlson, Shawn R. , Hartman, Glen L. , Li, Shuxian , Nelson, Randall L. , Diers, Brian W.
Glycine max , soybeans , fungal diseases of plants , Fusarium solani , plant pathogenic fungi , pathogenicity , signs and symptoms (plants) , disease resistance , plant breeding , progeny testing , genes , chromosome mapping , quantitative trait loci , linkage groups , genotype , cultivars , genetic variation
- Includes references
- Molecular breeding 2007 Aug., v. 20, no. 1
- Dordrecht : Kluwer Academic Publishers
Journal Articles, USDA Authors, Peer-Reviewed
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.