Genes encoding plastid acetyl-CoA carboxylase and 3-phosphoglycerate kinase of the Triticum/Aegilops complex and the evolutionary history of polyploid wheat
Genes encoding plastid acetyl-CoA carboxylase and 3-phosphoglycerate kinase of the Triticum/Aegilops complex and the evolutionary history of polyploid wheat
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DOI：
10.1073/pnas.072223799
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发表时间：
2002-06-11
影响因子：
11.1
通讯作者：
Gornicki, P
中科院分区：
文献类型：
--
作者：
Huang, S;Sirikhachornkit, A;Gornicki, P
小麦的经典进化史是二倍体Triticum/Aegilops种（A， S， D）的适应性辐射、四倍体Triticum turgidum AABB和Triticum timopheevii AAGG和六倍体Triticum aestivum AABBDD种的基因组趋同和分化。为了确定小麦系中小麦种间的系统发育关系，我们分析了质体乙酰辅酶a羧化酶Acc-1和质体3-磷酸甘油酸激酶Pgk-1基因，并通过基因序列比较建立了小麦的进化时间表。乌拉尔小麦是四倍体和六倍体小麦的A基因组供体。多倍体小麦的A基因组在不到50万年前（MYA）从乌拉尔图小麦中分离出来，这表明多倍体小麦的起源相对较晚。结果表明，aestivum与aaegilops tauschii的D基因组序列相同，证实aestivum是由T. turgidum与Ae杂交而来。陶氏只有8000年前。A、B、D、G和S基因组的二倍体Triticum和Aegilops祖先辐射均为2.5-4.5 MYA。我们的数据表明，Acc-1和Pgk-1位点在不同谱系中具有不同的历史，表明基因组嵌合性和显著的种内分化。褐藻的S基因组部分位点与褐藻的G基因组有较近的亲缘关系，表明它们基因组的某些部分同源。所有被分析的Aegilops基因组都不是B基因组的近亲，因此B基因组的二倍体祖先仍然未知。
The classic wheat evolutionary history is one of adaptive radiation of the diploid Triticum/Aegilops species (A, S, D), genome convergence and divergence of the tetraploid (Triticum turgidum AABB, and Triticum timopheevii AAGG) and hexaploid (Triticum aestivum, AABBDD) species. We analyzed Acc-1 (plastid acetyl-CoA carboxylase) and Pgk-1 (plastid 3-phosphoglycerate kinase) genes to determine phylogenetic relationships among Triticum and Aegilops species of the wheat lineage and to establish the timeline of wheat evolution based on gene sequence comparisons. Triticum urartu was confirmed as the A genome donor of tetraploid and hexaplold wheat. The A genome of polyploid wheat diverged from T. urartu less than half a million years ago (MYA), indicating a relatively recent origin of polyploid wheat. The D genome sequences of T. aestivum and Aegilops tauschii are identical, confirming that T. aestivum arose from hybridization of T. turgidum and Ae. tauschii only 8,000 years ago. The diploid Triticum and Aegilops progenitors of the A, B, D, G, and S genomes all radiated 2.5-4.5 MYA. Our data suggest that the Acc-1 and Pgk-1 loci have different histories in different lineages, indicating genome mosaicity and significant intraspecific differentiation. Some loci of the S genome of Aegilops speltoides and the G genome of T. timophevii are closely related, suggesting the same origin of some parts of their genomes. None of the Aegilops genomes analyzed is a close relative of the B genome, so the diploid progenitor of the B genome remains unknown.