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Development of a second generation linkage map for almond using RAPD and SSR markers
T Joobeur1, N Periam, M C de Vicente
1Institut de Recerca i Tecnologia Agroalimentàries, Departament de Genètica Vegetal, Cabrils, Spain.
Genome
|September 13, 2000
Summary
New molecular markers, including random amplified polymorphic DNA (RAPD) and simple sequence repeats (SSRs), were added to enhance the almond genetic map. This expansion improved the genetic map
Area of Science:
- Plant genetics
- Molecular biology
- Agricultural science
Background:
- Genetic mapping is crucial for understanding crop traits.
- Previous almond genetic maps relied on RFLPs and isozymes.
- Expanding these maps with new markers aids trait analysis.
Purpose of the Study:
- To incorporate random amplified polymorphic DNA (RAPD) and simple sequence repeat (SSR) markers into an existing almond genetic map.
- To increase the density and accuracy of the almond linkage map.
- To evaluate the utility of RAPD markers for genetic map completion.
Main Methods:
- Screened 325 primers to identify 41 reproducible RAPD markers.
- Mapped 6 SSR markers, with polymorphism detected in 4.
- Integrated new RAPD and SSR markers with existing RFLP and isozyme data.
- Placed all markers onto the 8 established linkage groups for almond ('Ferragnès' x 'Tuono').
Main Results:
- Added 54 RAPD and 6 SSR markers to the existing map.
- The new markers increased the total map size by 5% for both 'Ferragnès' and 'Tuono' cultivars.
- The final almond genetic map comprised 126 markers for 'Ferragnès' and 99 for 'Tuono'.
- Markers were distributed across linkage groups, with some in low-density regions.
Conclusions:
- RAPD and SSR markers effectively enhance existing genetic maps.
- The expanded map provides a more detailed framework for almond genetic studies.
- This approach facilitates the integration of diverse marker types for comprehensive genetic mapping.