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Abstract
Hexaploid wheat (Triticum aestivum L.) is a natural allopolyploid and provides a usable model system to better understand the genetic mechanisms that underlie allopolyploid speciation through the hybrid genome doubling. Here we aimed to identify the contribution of chromosome 1D in the development and evolution of hexaploid wheat. We identified and mapped a novel DEFECTIVE ENDOSPERM–D1 (Dee-D1) locus on 1DL that is involved in the genetic control of endosperm development. The absence of Dee-D1 leads to non-viable grains in distant crosses and alters grain shape, which negatively affects grain number and thousand-grain weight. Dee-D1 can be classified as speciation locus with a positive effect on the function of genes which are involved in endosperm development in hybrid genomes. The presence of Dee-D1 is necessary for the normal development of endosperm, and thus play an important role in the evolution and improvement of grain yield in hexaploid wheat.
Natalia Tikhenko et al. investigate the genetic contribution of the wheat chromosome 1D to its development and evolution. They find a novel locus, DEFECTIVE ENDOSPERM-D1, on the long arm of 1D that is required for normal endosperm development as its absence leads to non-viable grains and altered grain shape.
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1 Leibniz Inst Plant Genet & Crop Plant Res (IPK), OT Gatersleben, Seeland, Germany; Russian Academy of Sciences, Vavilov Institute of General Genetics, Moscow, Russia (GRID:grid.4886.2) (ISNI:0000 0001 2192 9124)
2 Leibniz Inst Plant Genet & Crop Plant Res (IPK), OT Gatersleben, Seeland, Germany (GRID:grid.4886.2); Martin Luther University Halle‐ Wittenberg, Institute of Agricultural and Nutritional Sciences, Halle (Saale), Germany (GRID:grid.9018.0) (ISNI:0000 0001 0679 2801)
3 Leibniz Inst Plant Genet & Crop Plant Res (IPK), OT Gatersleben, Seeland, Germany (GRID:grid.9018.0)
4 Leibniz Inst Plant Genet & Crop Plant Res (IPK), OT Gatersleben, Seeland, Germany (GRID:grid.9018.0); Sichuan Agricultural University, Triticeae Research Institute, Chengdu, China (GRID:grid.80510.3c) (ISNI:0000 0001 0185 3134)
5 Leibniz Inst Plant Genet & Crop Plant Res (IPK), OT Gatersleben, Seeland, Germany (GRID:grid.80510.3c)
6 TraitGenetics GmbH, Gatersleben, Germany (GRID:grid.80510.3c)
7 Leibniz Inst Plant Genet & Crop Plant Res (IPK), OT Gatersleben, Seeland, Germany (GRID:grid.80510.3c); Martin Luther University Halle‐ Wittenberg, Institute of Agricultural and Nutritional Sciences, Halle (Saale), Germany (GRID:grid.9018.0) (ISNI:0000 0001 0679 2801)