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GrainGenes Reference Report: MGG-241-483

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Reference
MGG-241-483
Title
Homoeologous relationships of rice, wheat and maize chromosomes
Journal
Molecular and General Genetics
Year
1993
Volume
241
Pages
483-490
Author
Ahn S
Anderson JA
Sorrells ME
Tanksley SD
Type
Article
Language
English
Abstract
A set of cDNA clones, that had been previously mapped onto the wheat chromosomes , have been genetically mapped onto the rice chromosomes. The resulting comparative maps make it possible to estimate the degree of linkage conservation between these two species. A number of chromosomal rearrangements, some of which must have involved interchromosomal translocations, differentiate the rice and wheat genomes. However, the synteny of a large portion of the loci appear to be conserved between the two species. The result from this study, combined with those from a recently-published comparative map of the rice and maize genomes (Ahn and Tanksley 1993), suggests that rice, wheat and maize share extensive homoeologies in a number of regions in their genomes. Some chromosomes (e.g. chromosome 4 in rice, chromosome 2 in maize and wheat) may have remained without major rearrangements since the divergence of these species from their last common ancestor. Comparative maps for rice, wheat and maize should make it possible to begin uniting the genetics of these species and to allow for cross-access of mapping information (including centromere positions) and molecular marker resources (e.g. RFLP probes). In addition they should shed light on the nature of chromosome evolution that accompanied the radiation of grasses in the early periods of plant evolution.
Map Data
Rice/maize/wheat
Keyword
comparative maps
dysploidy decrease
translocation
Image
Ahn-S, 1993 Fig. 1
Ahn-S, 1993 Fig. 2

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