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Related Experiment Videos

Mapping RFLP loci in maize using B-A translocations.

D Weber1, T Helentjaris

  • 1Department of Biological Sciences, Illinois State University, Normal 61761.

Genetics
|March 1, 1989
PubMed
Summary

Researchers mapped maize (Zea mays L.) chromosomes using B-A translocations and RFLP analysis. This study precisely identified chromosome arms and centromere locations on the RFLP map.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Plant Science

Background:

  • Maize (Zea mays L.) chromosome mapping is crucial for understanding its genome.
  • B-A translocations provide a tool for generating hypoploid plants with specific chromosomal deletions.
  • Restriction Fragment Length Polymorphism (RFLP) analysis is a key molecular technique for genetic mapping.

Purpose of the Study:

  • To precisely map chromosomal segments in maize using B-A translocations.
  • To correlate the RFLP map with cytological and conventional genetic maps.
  • To identify chromosome arms and centromere locations on the maize RFLP map.

Main Methods:

  • Generation of hypoploid maize plants using 24 different B-A translocations.
  • Crossing B-A translocation-carrying plants with inbreds to obtain hypoploid and nonhypoploid siblings.
  • DNA extraction, restriction enzyme digestion, gel electrophoresis, blotting, and RFLP analysis using mapped DNA probes.

Main Results:

  • Successfully identified the specific chromosomal segment uncovered by each B-A translocation on the RFLP map.
  • Unequivocally determined the short and long arms of each mapped maize chromosome.
  • Located the centromere region for each chromosome on the RFLP map.

Conclusions:

  • This study refined the maize RFLP map by integrating B-A translocation data.
  • The findings provide a more accurate correlation between RFLP, cytological, and genetic maps.
  • Precise identification of chromosome arms and centromeres enhances future maize genetic studies.

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