Development and characterization of a wild emmer wheat backcross introgression population for hard winter wheat improvement
No hay miniatura disponible
Fecha
Título de la revista
ISSN de la revista
Título del volumen
Editor
Wiley
Resumen
Descripción
Wild emmer wheat (Triticum turgidum subsp. dicoccoides) is the tetraploid progen-itor of hexaploid bread wheat (Triticum aestivum L.) and is known to be a valuablesource of genetic variation for wheat improvement. However, direct evaluation ofwild emmer diversity for agronomic potential has limited value unless performed inthe backgrounds of adapted cultivars. Here, we present a genetic characterization ofa population of 1601 backcross recombinant inbred lines, with an average genomecomposition of 75% bread wheat and 25% wild emmer. Low-coverage whole-genomesequencing allowed introgressions and aneuploidies to be identified at a relativelylow cost per sample. We identified a relatively large proportion of small introgres-sions (median length 38 Mb), and we found introgressions to be distributed across allchromosomes. Approximately 44% of genotyped progeny carried at least one aneu-ploidy, with monosomies being by far the most common. This population, whichwe have denoted as the Great Plains Wild Emmer/Hard Winter Wheat introgressionpopulation (GPWEW-IP), is, to our knowledge, the first introgression populationdeveloped through the direct hybridization of wild emmer wheat and US-adaptedhard winter wheat. We believe that this population represents a valuable resource forwheat breeders and will accelerate the discovery and integration of useful variationfrom wild emmer wheat.
Palabras clave
triticum turgidum, wheat, genetic variation