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Physical and topographical mapping among Triticeae chromosomes
R G Herrmann1, R Martin, W Busch
1Botanisches Institut der Ludwig-Maximilians-Universität München, Germany.
Symposia of the Society for Experimental Biology
|January 1, 1996
Summary
This study analyzes Triticeae genomes using synteny, light microscopy, and electron microscopy. Researchers developed methods for high-density physical mapping and identified conserved synteny across grass genomes.
Area of Science:
- Genomics
- Molecular Biology
- Cytogenetics
Background:
- Triticeae genomes are complex and require advanced analytical methods.
- Understanding genome structure and synteny is crucial for crop improvement.
Purpose of the Study:
- To analyze Triticeae genomes using three distinct approaches.
- To construct a high-density physical consensus map of wheat.
- To refine physical mapping techniques for plant chromosomes.
Main Methods:
- Synteny analysis using wheat deletion lines and RFLP markers.
- Light microscopic in situ techniques, including fluorescence in situ hybridization (FISH) and scanning electron microscopy.
- Physical mapping of rDNA sequences using high-resolution electron microscopy and colloidal gold probes.
Main Results:
- Established colinearity between wheat, barley, and Agropyron genomes.
- Developed sensitive FISH and high-resolution SEM techniques for plant chromosomes.
- Successfully mapped low-copy sequences and refined the physical location of the Sec-1 locus.
- Characterized repetitive sequences for karyotyping and comparative hybridization across Triticeae species.
- Localized rDNA sequences in barley chromosomes using electron microscopy.
Conclusions:
- The integrated approaches provide a high-resolution physical map of Triticeae genomes.
- Advanced in situ techniques enhance the sensitivity and resolution of genomic analysis.
- Repetitive DNA elements are valuable tools for comparative genomics and karyotyping within the Triticeae tribe.