Claim · model-written summary
The 5S rDNA locus on chromosome 1S was probably lost in ancient Ae. speltoides before Timopheevii wheat formed.
- Taxon
- Ae. speltoidese0
- Gene
- 5S rDNA locuse0
- Outcome
- probably loste0
- Qualifier
- prior to formation of Timopheevii wheat, but after the emergence of ancient emmere0
Not reportedMaterialCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Verbatim
e0“The 5S rDNA locus on chromosome 1S was probably lost in ancient Ae. speltoides prior to formation of Timopheevii wheat, but after the emergence of ancient emmer”
Title
Evolution of the S-genome in Triticum and Aegilops
Plant Genetics, Genomics, Bioinformatics, and Biotechnology (PlantGen2019) The Fifth International Scientific Conference 2019. doi:10.18699/plantgen2019-017
Other claims from this paper (13)
- Observation Diploid species split into Emarginata and Truncata groups with different chromosome patterns and repeat distributions.
- Observation Polyploid wheat B and G genomes most resembled the S genome of Ae. speltoides.
- Mechanism Allopolyploid wheat genomes evolved through species-specific translocations and repeat sequence changes independent of Ae. speltoides.
- Association Emarginata evolution was associated with increases in heterochromatin.
- Association Emarginata evolution was associated with amplification of Spelt-52.
- Association Emarginata evolution was associated with repatterning of pAesp_SAT86.
- Association Emarginata evolution was associated with gradual elimination of D genome repeats.
- Observation The emergence of Ae. variabilis did not significantly change the parental S* genome.
- Observation The emergence of Ae. kotschyi did not significantly change the parental S* genome.
- Observation Both tetraploid species showed partial elimination of 45S rDNA repeats.
- Observation Both tetraploid species showed altered C-banding and FISH patterns.
- Observation Similarity between Ae. vavilovii and Ae. searsii S genomes confirmed the hexaploid origin.
- Method / resource The authors suggested a model of S-genome evolution.