Microsatellite mapping of genes that determine supernumerary spikelets in wheat (T. aestivum) and rye (S. cereale)
Microsatellite mapping of genes that determine supernumerary spikelets in wheat (T. aestivum) and rye (S. cereale)
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DOI：
10.1007/s00122-009-1095-1
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发表时间：
2009-09-01
影响因子：
5.4
通讯作者：
Boerner, Andreas
中科院分区：
文献类型：
--
作者：
Dobrovolskaya, Oxana;Martinek, Petr;Boerner, Andreas
小麦和黑麦穗通常每个轴节着生一个小穗，很少出现额外的小穗。利用微卫星标记对F-2群体进行遗传分析，定位了小麦的“多棱穗”或MRS性状和黑麦的“大穗”性状。MRS和‘Monstrosum’性状均受单基因座隐性等位基因控制。Mrs1基因座位于染色体2DS上，与微卫星基因座Xwmc453共分离。位于染色体缺失框2DS-5(FL 0.47-1.0)的侧翼微卫星座位将MRS 1的物理位置限定在染色体臂2DS的远端半部，位于2S0.8基因富集区。MO1基因座位于染色体臂2RS上距着丝粒约10 cM的位置。MO1和mrs1在表型上的相似效应，以及它们在保守的同步性区域的存在，表明它们很可能是控制穗分枝的一组小麦同源基因的成员。MRS穗的实际重要性在于，它每穗产生更多的小穗，从而提高小麦的库容量，这被认为限制了作物的产量潜力。
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.