A-A Translocations: Breakpoints and Stocks

  • E. H. Coe
Part of the Springer Lab Manuals book series (SLM)


A remarkable resource of cytogenetic modifications, far beyond those available in most other experimental species, is available in the reciprocal translocations between A chromosomes of maize. Translocations were originally found in the 1920s (Brink 1927; Burnham 1930) as spontaneously arising, segregating “semisteriles” (i.e., plants with 50% aborted pollen and eggs). Physical exchange of chromosome segments was revealed by cross-shaped configurations of four elements at pachytene (McClintock 1930). Numbers of translocations were isolated following X-irradiation (Anderson 1935; 64 additional translocations). The resource was greatly expanded with interchanges induced by exposure to nuclear explosions; these and the other collections were all characterized cytologically by Longley (1961). See the previous chapter by Patterson for a description of the transmission genetics of translocations.


Reciprocal Translocation Nuclear Explosion Previous Chapter Translocation Breakpoint Transmission Genetic 
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  2. Brink RA (1927) The occurrence of semi-sterility in maize. J Hered 18: 266–270Google Scholar
  3. Burnham CR (1930) Genetical and cytological studies of semisterility and related phenomena in maize. Proc Natl Acad Sci USA 16: 269–277PubMedCrossRefGoogle Scholar
  4. Longley AE (1961) Breakage points for four corn translocation series and other corn chromosome aberrations. USDA-ARS Crops Research Bulletin No. 34–16, 40 ppGoogle Scholar
  5. McClintock B (1930) A cytological demonstration of the location of an interchange between two non-homologous chromosomes of Zea mays. Proc Natl Acad Sci USA 16: 791–796PubMedCrossRefGoogle Scholar

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© Springer-Verlag New York, Inc. 1994

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  • E. H. Coe

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