Reconciling the evolutionary origin of bread wheat (Triticum aestivum).
2017
Summary The origin of bread wheat (Triticum aestivum; AABBDD) has been a subject of controversy and of intense debate in the scientific community over the last few decades. In 2015, three articles published in New Phytologist discussed the origin of hexaploid bread wheat (AABBDD) from the
diploid
progenitors
Triticum urartu(AA), a relative of
Aegilops speltoides(BB) and
Triticum tauschii(DD). Access to new genomic resources since 2013 has offered the opportunity to gain novel insights into the paleohistory of modern bread wheat, allowing characterization of its origin from its
diploid
progenitorsat unprecedented resolution. We propose a reconciled evolutionary scenario for the modern bread wheat genome based on the complementary investigation of
transposable elementand mutation dynamics between
diploid, tetraploid and hexaploid wheat. In this scenario, the structural asymmetry observed between the A, B and D subgenomes in hexaploid bread wheat derives from the cumulative effect of
diploid
progenitordivergence, the hybrid origin of the D subgenome, and subgenome partitioning following the
polyploidizationevents.
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