Researchers mapped the DNA of 828 old Indian wheat landraces and 100 modern varieties, then picked a quarter of them that capture nearly all the genetic variety. That smaller set gives breeders a practical starting point for building wheat that handles heat and drought.
1
A core set of 25% of accessions retained 99.74% of alleles and showed similar or greater diversity than the full 928-accession panel (828 landraces plus 100 cultivars).
2
Population analysis found two major genetic clusters (K = 2) with finer subdivision into six groups; most variation was within groups rather than between them.
3
The B genome had the highest SNP density, followed by A and D; linkage disequilibrium decayed fastest in the A genome and slowest in the B genome, and landraces had lower nucleotide diversity than improved cultivars.
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