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A Simple Method for Isolation of Soybean Protoplasts and Application to Transient Gene Expression Analyses
Published on: January 25, 2018
Mapping tightly linked genes controlling potyvirus infection at the Rsv1 and Rpv1 region in soybean
M A Gore1, A J Hayes, S C Jeong
1Department of Crop and Soil Environmental Sciences, Virginia Polytechnic Institute and State University, Blacksburg 24061, USA.
Genome
|May 30, 2002
Summary
Soybean mosaic virus (SMV) and peanut mottle virus (PMV) resistance genes Rsv1 and Rpv1 are tightly linked in soybean. This genetic linkage provides insights into potyvirus recognition mechanisms and potential for resistance screening.
Area of Science:
- Plant Pathology
- Molecular Genetics
- Crop Science
Background:
- Soybean mosaic virus (SMV) and peanut mottle virus (PMV) are significant threats to soybean (Glycine max (L.) Merr.) production worldwide, causing substantial yield losses and reduced seed quality.
- The genes Rsv1 and Rpv1 confer resistance to SMV and PMV, respectively, making their characterization crucial for understanding potyvirus recognition in soybean.
Purpose of the Study:
- To isolate and characterize the Rsv1 and Rpv1 genes in soybean.
- To determine the genetic linkage between Rsv1, Rpv1, and other disease resistance genes.
- To investigate the molecular mechanisms underlying potyvirus resistance in soybean.
Main Methods:
- A population of 1056 F2 individuals was generated from a cross between a resistant soybean line (PI 96983) and a susceptible cultivar ('Lee 68').
- Disease reaction assays and molecular marker analyses (RFLP, RAPD, microsatellite) were employed to map resistance loci.
- Fine mapping was conducted on F2 lines exhibiting recombination between Rsv1-flanking microsatellite markers.
Main Results:
- Rsv1 and Rpv1 were found to be tightly linked, located 1.1 cM apart within a 6.8-cM region containing 38 mapped loci.
- Resistance-gene candidate sequences were mapped adjacent to and cosegregated with the Rsv1 and Rpv1 loci.
- Evidence suggests that multiple tightly linked genes contribute to the resistance response against SMV.
Conclusions:
- The tight genetic linkage of Rsv1 and Rpv1 provides a foundation for understanding potyvirus resistance mechanisms in soybean.
- The identified resistance loci and candidate genes offer potential targets for marker-assisted selection to develop SMV and PMV resistant soybean varieties.
- Further investigation into the identified resistance-gene candidates is warranted to fully elucidate their role in soybean immunity to potyviruses.
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