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GrainGenes Reference Report: TAG-119-867

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Reference	TAG-119-867
Title	Microsatellite mapping of genes that determine supernumerary spikelets in wheat (T. aestivum) and rye (S. cereale).
Journal	Theoretical and Applied Genetics
Year	2009
Volume	119
Pages	867-874
Remark	Results in the Catalog of Gene Symbols for Wheat prior to publication and curated in GrainGenes as MAN-2009
Author	[ Hide all but 1 of 8 ] Dobrovolskaya O Martinek P Voylokov AV Korzun V Roeder MS Boerner A Roder MS Borner A
Abstract	The wheat and rye spike normally bears one spikelet per rachis node, and the appearance of supernumerary spikelets is rare. The loci responsible for the 'multirow spike' or MRS trait in wheat, and the 'monstrosum spike' trait in rye were mapped by genotyping F(2) populations with microsatellite markers. Both MRS and the 'monstrosum' trait are under the control of a recessive allele at a single locus. The Mrs1 locus is located on chromosome 2DS, co-segregating with the microsatellite locus Xwmc453. The placement of flanking microsatellite loci into chromosome deletion bin 2DS-5 (FL 0.47-1.0) delimited the physical location of Mrs1 to the distal half of chromosome arm 2DS, within the gene rich region 2S0.8. The Mo1 locus maps about 10 cM from the centromere on chromosome arm 2RS. The similar effect on phenotype of mo1 and mrs1, together with their presence in regions of conserved synteny, suggest that they may well be members of an orthologous set of Triticeae genes governing spike branching. The practical importance of the MRS spike is that it produces more spikelets per spike, and thereby enhances the sink capacity of wheat, which is believed to limit the yield potential of the crop.
External Databases	http://dx.doi.org/10.1007/s00122-009-1095-1
Gene	bh-D1 (Triticum) bh-R1 (Secale)
Gene Class	Branched spike
Germplasm	Ra1 Ruc163-1-02 Ruc167-1-02 D40 (rye)
Locus	mo1(bh-R1) [ Show all 7 ]
Map Data	Wheat, Branched spike gene, 2009

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