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Research article - Peer-reviewed, 2017

Genetic Diversity within a Global Panel of Durum Wheat (Triticum durum) Landraces and Modern Germplasm Reveals the History of Alleles Exchange

Kabbaj, Hafssa; Sall, Amadou T.; Al-Abdallat, Ayed; Geleta, Mulatu; Amri, Ahmed; Filali-Maltouf, Abdelkarim; Belkadi, Bouchra; Ortiz, Rodomiro; Bassi, Filippo M.

Abstract

Durum wheat is the 10th most important crop in the world, and its use traces back to the origin of agriculture. Unfortunately, in the last century only part of the genetic diversity available for this species has been captured in modern varieties through breeding. Here, the population structure and genetic diversity shared among elites and landraces collected from 32 countries was investigated. A total of 370 entries were genotyped with Axiom 35K array to identify 8,173 segregating single nucleotide polymorphisms (SNPs). Of these, 500 were selected as highly informative with a PIC value above 0.32 and used to test population structure via DAPC, STRUCTURE, and neighbor joining tree. A total of 10 sub-populations could be identified, six constituted by modern germplasm and four by landraces of different geographical origin. Interestingly, genomic comparison among groups indicated that Middle East and Ethiopia had the lowest level of allelic diversity, while breeding programs and landraces collected outside these regions were the richest in rare alleles. Further, phylogenetic analysis among landraces indicated that Ethiopia might represent a second center of origin of durum wheat, rather than a second domestication site as previously believed. Together, the analyses carried here provide a global picture of the available genetic diversity for this crop and shall guide its targeted use by breeders.

Keywords

center of diversity; couscous; domestication; evolution; pasta; Axiom 35K; array; durum wheat

Published in

Frontiers in Plant Science
2017, volume: 8, article number: 1277

Authors' information

Kabbaj, Hafssa
International Centre for Agricultural Research in the Dry Areas (ICARDA)
Sall, Amadou T.
International Centre for Agricultural Research in the Dry Areas (ICARDA)
Al-Abdallat, Ayed
University of Jordan
Geleta, Mulatu Dida (Dida, Mulatu Geleta)
Swedish University of Agricultural Sciences, Department of Plant Breeding
Amri, Ahmed
International Centre for Agricultural Research in the Dry Areas (ICARDA)
Filali-Maltouf, Abdelkarim
Mohammed V University
Belkadi, Bouchra
Mohammed V University
Swedish University of Agricultural Sciences, Department of Plant Breeding
Bassi, Filippo M.
International Centre for Agricultural Research in the Dry Areas (ICARDA)

Sustainable Development Goals

SDG2 Zero hunger

UKÄ Subject classification

Plant Biotechnology
Agricultural Science
Genetics and Breeding

Publication Identifiers

DOI: https://doi.org/10.3389/fpls.2017.01277

URI (permanent link to this page)

https://res.slu.se/id/publ/83632