Mutations in Wheat that Raise the Level of Meiotic Chromosome Pairing

  • E. R. Sears
Part of the Stadler Genetics Symposia Series book series (SGSS)


That chromosome 5B of wheat suppresses the pairing of homoeologous (related) chromosomes was discovered by Okamoto (1957) and Sears and Okamoto (1958) in Missouri and independently by Riley and Chapman (1958) in England. This discovery answered the question why the chromosomes of the three genomes of wheat are unable to pair with each other even though they are genetically so closely related that extra dosage of the right chromosome can compensate substantially for the complete absence of a particular chromosome of either of the other two genomes. Also, the discovery of the 5B effect suggested a way of inducing the chromosomes of wheat to pair with those of other species and genera; namely, by deleting 5B or the gene concerned.


Chromosome Pairing Alien Chromosome Homoeologous Pairing Logous Pairing Pairing Level 
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Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • E. R. Sears
    • 1
  1. 1.Department of AgronomyUniversity of MissouriColumbiaUSA

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