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Genetics, Vol 138, 1287-1292, Copyright © 1994
INVESTIGATIONS |
Relationship Between Chromosome 9 of Maize and Wheat Homeologous Group 7 Chromosomes
K. M. Devos, S. Chao, Q. Y. Li, M. C. Simonetti and M. D. Gale
John Innes Centre, Norwich Research Park, Colney, Norwich NR4 7UH, United Kingdom
Comparison of the genetic map of maize chromosome 9 with maps of wheat chromosomes has revealed a high degree of colinearity between maize chromosome 9 and the group 4 and 7 chromosomes of wheat. The order of DNA markers on the short arm and a proximal region of the long arm of the genetic map of maize chromosome 9 is highly conserved with the marker order on the short arm and proximal region of the long arm of the genetic maps of the wheat homeologous group 7 chromosomes. A major part of the long arm of the genetic map of maize chromosome 9 is homeologous with a short segment in the proximal region of the long arm of the genetic map of the wheat group 4 chromosomes. Evidence is also presented that maize chromosome 9 has diverged from the wheat group 7 chromosomes by both a pericentric and a paracentric inversion. The paracentric inversion is probably unique to maize among the major cereal genomes.
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