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GrainGenes Reference Report: TAG-108-1182

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Reference	TAG-108-1182
Title	High-resolution organellar genome analysis of Triticum and Aegilops sheds new light on cytoplasm evolution in wheat
Journal	Theoretical and Applied Genetics
Year	2004
Volume	108
Pages	1182-1190
Author	Provan J Wolters P Caldwell KH Powell W
Abstract	Summary: We have utilised polymorphic chloroplast microsatellites to analyse cytoplasmic relationships between accessions in the genera Triticum and Aegilops. Sequencing of PCR products revealed point mutations and insertions/deletions in addition to the standard repeat length expansion/contraction which most likely represent ancient synapomorphies. Phylogenetic analyses revealed three distinct groups of accessions. One of these contained all the non-Aegilops speltoides S-type cytoplasm species, another comprised almost exclusively A, C, D, M, N, T and U cytoplasm-type accessions and the third contained the polyploid Triticum species and all the Ae. speltoides accessions, further confirming that Ae. speltoides or a closely related but now extinct species was the original B-genome donor of cultivated polyploid wheat. Successive decreases in levels of genetic diversity due to domestication were also observed. Finally, we highlight the importance of elucidating longer-term evolutionary processes operating at microsatellite repeat loci
External Databases	Pubmed: 15067406
Keyword	[ Hide all but 1 of 33 ] accessions aegilops ancient apr b genome chloroplast chloroplast dna chloroplast microsatellites cytoplasm decreases diversity domestication evolution evolutionary genetic diversity genome genome analysis high-resolution light locus molecular-basis origin pcr pcr products point mutation polyploid wheat products repeat simple sequence repeat speltoides triticum triticum and aegilops wild

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