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Description:
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We have constructed the first integrated consensus
map (ICM) for rose, based on the information of
four diploid populations and more than 1,000 initial markers.
The single population maps are linked via 59 bridge
markers, on average 8.4 per linkage group (LG). The integrated
map comprises 597 markers, 206 of which are
sequence-based, distributed over a length of 530 cM on
seven LGs. By using a larger effective population size and
therefore higher marker density, the marker order in the
ICM is more reliable than in the single population maps.
This is supported by a more even marker distribution and a
decrease in gap sizes in the consensus map as compared to
the single population maps. This unified map establishes a
standard nomenclature for rose LGs, and presents the
location of important ornamental traits, such as self-incompatibility,
black spot resistance (Rdr1), scent production
and recurrent blooming. In total, the consensus map
includes locations for 10 phenotypic single loci, QTLs for 7
different traits and 51 ESTs or gene-based molecular
markers. This consensus map combines for the first time the
information for traits with high relevance for rose variety
development. It will serve as a tool for selective breeding
and marker assisted selection. It will benefit future efforts of
the rose community to sequence the whole rose genome
and will be useful for synteny studies in the Rosaceae
family and especially in the section Rosoideae.
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