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Genetic mapping and variability of seven soybean simple sequence repeat loci
M Morgante1, A Rafalski, P Biddle
1Dipartimento di Produzione Vegetale e Tecnologie Agrarie, Università di Udine, Italy.
Genome
|October 1, 1994
Summary
Simple sequence repeat polymorphisms (SSRPs) offer a more informative and accessible method for soybean genetic mapping compared to RFLP markers. Allelic variation in soybeans significantly decreases with domestication, highlighting the importance of wild soybean germplasm.
Area of Science:
- Genetics
- Plant Science
- Molecular Biology
Background:
- Microsatellites, also known as simple sequence repeats (SSRs), are repetitive DNA sequences found in eukaryotic genomes.
- Simple sequence repeat polymorphisms (SSRPs) are valuable genetic markers that have recently gained attention in plant research.
Purpose of the Study:
- To establish the genetic map positions of seven soybean (Glycine max and Glycine soja) SSRS within sequenced genes.
- To compare the informativeness and ease of analysis of SSRPs against Restriction Fragment Length Polymorphism (RFLP) markers in soybean.
Main Methods:
- Mapping of seven soybean SSR loci, with four representing new gene positions and three confirming existing RFLP map locations.
- Screening of 61 soybean accessions at four SSR loci using agarose gel electrophoresis.
- Comparison of allelic variation between SSRPs and RFLPs in a subset of 19 soybean lines.
Main Results:
- SSRPs provided higher average number of alleles per locus (7.75) compared to RFLPs (2.15) in soybean.
- Allelic variation decreased significantly from wild soybean (84% differentiation) to elite germplasm (43% differentiation).
- SSRPs were found to be more informative and easier to analyze than RFLP markers, despite requiring more development effort.
Conclusions:
- SSRPs are a powerful tool for genetic mapping and diversity studies in soybean.
- Domestication significantly reduces genetic diversity in soybean, emphasizing the value of wild relatives.
- SSRPs offer advantages over RFLPs for genetic analysis in soybean.