Genealogy
Durum wheat is a tetraploid wheat, having 28 chromosomes, unlike hard red winter and hard red spring wheats, which are hexaploid and have 42 chromosomes each.
Durum wheat originated through intergeneric hybridization and polyploidization involving two diploid grass species: T. urartu (2n = 2x = 14, AA genome) and a B-genome diploid related to Aegilops speltoides (2n = 2x = 14, SS genome) and is thus an allotetraploid species.
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