Query (optional)   in Class  All Allele Author Colleague Collection Assembly Gene Gene Class Gene Product Germplasm Image Journal Keyword Library Locus Map Map Data Marker Pathology Polymorphism Probe Protein QTL Rearrangement Reference Sequence Species Trait Trait Study Two Point Data  

---

GrainGenes Reference Report: PNA-99-8133

[Submit comment/correction]

Reference	PNA-99-8133
Title	Genes encoding plastid acetyl-CoA carboxylase and 3-phosphoglycerate kinase of the Triticum/Aegilops complex and the evolutionary history of polyploid wheat
Journal	Proceedings of the National Academy of Sciences, USA
Year	2002
Volume	99
Pages	8133-8138
Author	Huang S [ Show all 7 ]
Abstract	Summary: 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 hexaploid 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
External Databases	Pubmed: 12060759
Keyword	[ Hide all but 1 of 59 ] 3-phosphoglycerate 3-phosphoglycerate kinase acetyl-coa carboxylase adaptive radiation aegilops aegilops speltoides aegilops tauschii carboxylase chromosome complexes differentiation diploid divergence donor evolution evolutionary evolutionary history g genome gene gene sequence genome genome donor genome sequence hexaploid hexaploid wheat histories history hybridization intraspecific differentiation kinase lineage locus nuclear dna origin parts phylogenetic relationship phylogeny plastid polyploid polyploid wheat progenitor radiation relationships repeated nucleotide sequences rflp analysis sequence speltoides tauschii tetraploid timopheevii triticum triticum aestivum triticum and aegilops triticum timopheevii triticum turgidum triticum urartu turgidum washington wheat evolution

GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.