Evolution and origin of bread wheat.
Level 5 - mechanism / opinion, no new human data
Level 5 by design analogy; narrative review and evolutionary synthesis.
PubMed 35512194 · doi:10.1093/plcell/koac130
What was done
The authors synthesized genomic, genetic, and archaeological evidence regarding the evolutionary history, allopolyploidization, and progenitor species of hexaploid bread wheat (*Triticum aestivum*).
What was found
Bread wheat arose 8,500–9,000 years ago via hybridization between a domesticated free-threshing tetraploid progenitor (BBAA) and *Aegilops tauschii* (D genome donor). Recent genomic sequencing indicates the B subgenome donor was a distinct unknown or extinct species rather than a mosaic genome. The abstract provides no quantitative statistical metrics.
Why it matters
Understanding the hybrid origins and allopolyploidy of wheat clarifies the mechanisms of its adaptive plasticity and highlights the need to conserve its ancestral gene pool for food security.
Limits
The abstract describes a narrative review without primary empirical data, sample sizes, or formal search criteria. Discrepancies between archaeological and genetic data regarding the exact location of origin and the specific tetraploid progenitor remain unresolved.
Cited by
- supports Wheat is a hexaploid organism rather than a diploid organism.