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Sequence polymorphism in polyploid wheat and their d-genome diploid ancestor
Katherine S Caldwell1, Jan Dvorak, Evans S Lagudah
1E. I. DuPont Nemours, DuPont Agricultural Products, Newark, Delaware 19711, USA.
Genetics
|July 9, 2004
Summary
The D genome in wheat (Triticum aestivum) and Aegilops cylindrica likely originated from at least two distinct progenitors, based on sequencing of key genetic loci. This suggests a complex, recurrent evolutionary history for these important grass species.
Area of Science:
- Genomics
- Plant Genetics
- Evolutionary Biology
Background:
- The origin of the D genome in allopolyploid species like wheat (Triticum aestivum) and Aegilops cylindrica is crucial for understanding their evolution.
- Aegilops tauschii is recognized as the diploid progenitor of the wheat D genome.
Purpose of the Study:
- To investigate the ancestral origins of the D genome in Triticum aestivum and Aegilops cylindrica.
- To identify the genetic diversity and potential progenitors contributing to the D genome.
Main Methods:
- Sequencing of specific gene loci (Xwye838 and Gss) in Triticum aestivum and Aegilops tauschii.
- Analysis of single nucleotide polymorphism (SNP) variants and haplotypes within these loci.
Main Results:
- Two SNP variants at the Xwye838 locus and 11 haplotypes at the Gss locus were identified in Aegilops tauschii.
- Two distinct haplotypes were observed at each locus in Triticum aestivum.
- Both Xwye838 variants and one Gss haplotype from wheat were found in Ae. tauschii, but a second Gss haplotype in wheat was absent in both Ae. tauschii and Ae. cylindrica.
Conclusions:
- The D genome in both Triticum aestivum and Aegilops cylindrica likely arose through recurrent polyploidization events.
- At least two genetically distinct progenitor lineages contributed to the formation of the D genome in these species.