Plant Genome II Conference
Town & Country Conference Center, San Diego, CA, January, 1994.
PG-II: COMPARISON OF SUGARCANE, MAIZE AND SORGHUM GENOME MAPS
COMPARISON OF SUGARCANE, MAIZE AND SORGHUM GENOME MAPS.
Laurent Grivet, Angelique D'Hont, Daniele Roques, Philippe
Dufour, Perla Hamon and Jean Christophe Glaszmann, CIRAD-CA,
BIOTROP, B.P. 5035, 34032 Montpellier Cedex 1, France.
Comparative mapping within tribe Andropogoneae recently
progressed with the use of mapped maize genomic probes for
mapping the genomes of sorghum and of sugarcane. We used data
obtained from published studies and located the various linkage
groups of sugarcane and sorghum on the map of the maize genome.
The distribution of these linkage groups remarkably fits the
pattern of duplication in maize. However, several cases were
found where the two arms of a single maize chromosome may
correspond to at least two distinct linkage groups in both
sugarcane and sorghum. Apparently, the same large translocations
exist between maize and sugarcane and between maize and sorghum;
in this respect, sugarcane and sorghum appear more closely
related than either one with maize. We practised a more detailed
analysis within one linkage group common to all three plants in
order to compare recombination rates, using data recently
obtained with sugarcane. The three genomes showed full
colinearity in this region. Maize and sorghum displayed
comparable map distances, whereas sugarcane displayed much less
recombination, in the order of one fourth in the varietal progeny
under study.
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