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Two Tightly Linked Genes for Soybean Mosaic Virus Resistance in Soybean.
- Source :
-
Crop Science . Jul/Aug2017, Vol. 57 Issue 4, p1844-1853. 10p. - Publication Year :
- 2017
-
Abstract
- Soybean mosaic virus (SMV), a member of the Potyviridae family, is the most common virus negatively affecting yield and seed quality in soybean [Glycine max (L.) Merr.]. Seven SMV strains, G1 through G7, and three independent SMV resistance genes (R-genes), Rsv1, Rsv3, and Rsv4, have been previously identified. The Rsv1 locus contains at least 10 alleles conferring differential plant reactions to SMV strains, and it was mapped at very complex resistancegene-rich region. In this study, two alleles of the Rsv1 locus were analyzed by crossing PI 96983 (Rsv1) and cultivar York (Rsv1-y) soybean to evaluate whether Rsv1 and Rsv1-y belong to the same or different but closely linked loci. To break possible linkage, 3000 F2:3 lines were developed and investigated using infections of the SMVG1 strain in a greenhouse. The occurrence of segregating and susceptible lines indicated tight linkage between two genes. The recombination frequency (RF) was estimated using the maximum likelihood (ML) formula concluding that Rsv1 and Rsv1-y are two tightly linked loci located apart with genetic distance of 2.2 cM on chromosome 13. A new symbol of Rsv5 has been assigned for the resistance gene in York to replace the original Rsv1-y allele assignment. This research provided the first evidence for existence of two R-genes on chromosome 13, conferring resistance to different SMV strains. Both loci, Rsv1 and Rsv5, can be easily transferred into susceptible cultivars in a breeding program to provide broad and durable protection against SMV strains. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CROP genetics
*SOYBEAN
*SOYBEAN mosaic virus
*PLANT resistance to viruses
Subjects
Details
- Language :
- English
- ISSN :
- 0011183X
- Volume :
- 57
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Crop Science
- Publication Type :
- Academic Journal
- Accession number :
- 124754858
- Full Text :
- https://doi.org/10.2135/cropsci2016.05.0290