The effect of tropical sorghum conversion and inbred development on genome diversity as revealed by high-resolution genotyping
The effect of tropical sorghum conversion and inbred development on genome diversity as revealed by high-resolution genotyping
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DOI：
10.2135/cropsci2007.06.0319tpg
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发表时间：
2008-03-01
期刊：
影响因子：
2.3
通讯作者：
Klein, Patricia E.
中科院分区：
文献类型：
--
作者：
Klein, Robert R.;Mullet, John E.;Klein, Patricia E.
已生成了一组高粱[Sorcumbicolor（L.）Moench]种质，其中包括选定的公共近交系、来自世界收集的种质和对高粱早期育种工作至关重要的祖先系。我们目前的研究集中在高粱染色体SBI-06上，它编码mal和dw（2），这两个基因对高粱的改良至关重要，可以追溯到热带高粱最初引入美国。利用高粱品种间的系谱关系，在SBI-06的节段染色体块内详细描述了遗传变异的模式。片段基因组块可追溯到系谱的多代，通常可追溯到创始人热带加入。图形基因型揭示了历史育种决策的基因组特征，特别是热带加入温带适应转换过程中的定向选择的证据。这些信息是我们努力了解那些塑造了优良高粱品种基因组多样性的作物改良过程的核心。
Graphical genotypes have been generated for a set of sorghum [Sorghum bicolor (L.) Moench] germplasm, which includes selected public inbreds, germplasm from the world collection, and ancestral lines central to the early breeding efforts of sorghum. We have focused our present examination on sorghum chromosome SBI-06, which encodes mal and dw(2), two genes critical to sorghum improvement dating to the original introduction of tropical sorghums into the United States. Utilizing the pedigree relationship between sorghum cultivars, the patterns of genetic variation were detailed within segmental chromosomal blocks of SBI-06. Segmental genomic blocks were traced back through multiple generations of a pedigree, often back to founder tropical accessions. The graphical genotypes reveal genomic signatures of historical breeding decisions, especially evidence of directional selection during the conversion of tropical accessions to temperate adaptation. This information is central to our efforts to understand those crop improvement processes that have shaped the genomic diversity of elite sorghum cultivars.