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Low-copy microsatellite markers for Pinus taeda L
C G Elsik1, V T Minihan, S E Hall
1Graduate Genetics Program, Texas A&M University, College Station 77843-2135, USA.
Genome
|July 21, 2000
Summary
New microsatellite markers effectively analyze genetic diversity in loblolly pine (Pinus taeda L.). These markers reveal high polymorphism, crucial for understanding complex pine genomes and aiding conservation efforts.
Area of Science:
- Genetics
- Forestry
- Molecular Biology
Background:
- Microsatellite markers are valuable genetic tools for population studies.
- Developing informative markers for complex genomes like Pinus taeda is challenging.
- Existing markers may lack sufficient polymorphism for detailed genetic analysis.
Purpose of the Study:
- To evaluate the utility of 18 low-copy and genomic microsatellite markers for Pinus taeda.
- To assess Mendelian inheritance and polymorphism levels of these markers.
- To determine the informativeness of markers for genetic studies in Pinus taeda.
Main Methods:
- Testing 18 microsatellite markers for Mendelian inheritance.
- Assaying markers in 41 Pinus taeda samples from five southern US regions.
- Analyzing PCR products for allele number, polymorphism, and non-specific priming.
- Evaluating marker informativeness using a three-generation RFLP pedigree.
Main Results:
- All 18 markers showed Mendelian inheritance.
- Markers exhibited multiple alleles, high polymorphism, and minimal non-specific priming.
- Fifteen markers were informative for the P. taeda pedigree.
- Allele numbers ranged from 3 to 28 per locus.
- High polymorphic information content (PIC) was linked to complex and long perfect repeat sequences and abundant low-frequency alleles.
Conclusions:
- Low-copy microsatellites are highly effective for the large Pinus taeda genome.
- These markers are particularly useful given limited public gene sequence data.
- The developed markers provide valuable genetic resolution for Pinus taeda research and conservation.