Genetic structure of modern durum wheat cultivars and Mediterranean landraces matches with their agronomic performance
Soriano Soriano, Jose Miguel (Institut de Recerca i Tecnologia Agroalimentàries)
Villegas Tort, Dolors (Institut de Recerca i Tecnologia Agroalimentàries)
Aranzana, Maria José (Centre de Recerca en Agrigenòmica)
García del Moral, Luis F. (Universidad de Granada. Instituto de Biotecnología)
Royo, Concepción (Institut de Recerca i Tecnologia Agroalimentàries)

Fecha:	2016
Resumen:	A collection of 172 durum wheat landraces from 21 Mediterranean countries and 20 modern cultivars were phenotyped in 6 environments for 14 traits including phenology, biomass, yield and yield components. The genetic structure of the collection was ascertained with 44 simple sequence repeat markers that identified 448 alleles, 226 of them with a frequency lower than 5%, and 10 alleles per locus on average. In the modern cultivars all the alleles were fixed in 59% of the markers. Total genetic diversity was HT = 0. 7080 and the genetic differentiation value was GST = 0. 1730. STRUCTURE software allocated 90. 1% of the accessions in five subpopulations, one including all modern cultivars, and the four containing landrace related to their geographic origin: eastern Mediterranean, eastern Balkans and Turkey, western Balkans and Egypt, and western Mediterranean. Mean yield of subpopulations ranged from 2. 6 t ha-1 for the western Balkan and Egyptian landraces to 4. 0 t ha-1 for modern cultivars, with the remaining three subpopulations showing similar values of 3. 1 t ha-1. Modern cultivars had the highest number of grains m-2 and harvest index, and the shortest cycle length. The diversity was lowest in modern cultivars (HT = 0. 4835) and highest in landraces from the western Balkans and Egypt (HT = 0. 6979). Genetic diversity and AMOVA indicated that variability between subpopulations was much lower (17%) than variability within them (83%), though all subpopulations had similar biomass values in all growth stages. A dendrogram based on simple sequence repeat data matched with the clusters obtained by STRUCTURE, improving this classification for some accessions that have a large admixture. landraces included in the subpopulation from the eastern Balkans and Turkey were separated into two branches in the dendrogram drawn with phenotypic data, suggesting a different origin for the landraces collected in Serbia and Macedonia. The current study shows a reliable relationship between genetic and phenotypic population structures, and the connection of both with the geographic origin of the landraces.
Ayudas:	Ministerio de Economía y Competitividad AGL-2006-09226-C02-01
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Publicado en:	PloS one, Vol. 11, issue 8 (2016) , e0160983, ISSN 1932-6203

DOI: 10.1371/journal.pone.0160983
PMID: 27513751

19 p, 2.5 MB

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