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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Understanding the relationships between genetic and phenotypic structures of a collection of elite durum wheat accessions
Field Crops Research, Volume 119, No. 1, Year 2010
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Description
A collection of 191 durum wheat accessions representing Mediterranean Basin genetic diversity was grown in nine different environments in four countries, with productivities ranging from 0.99 to 6.78tha-1. The population breeding structure comprised eight genetic subpopulations (GSPs) using data derived from 97 evenly distributed SSR markers. The phenotypic structure was assessed: (i) from the mean values of six agronomic traits across environments (multivariate), and (ii) from data representing each trait in each environment (univariate). Mean daily maximum temperature from emergence to heading was significantly (P<0.05) and negatively associated to yield, accounting for 59% of yield variations. Significant but weak relationships were obtained between the genetic similarities among accessions and their overall agronomic performance (r=0.15, P<0.001), plant height (r=0.12, P<0.001), spike-peduncle length (r=0.06, P<0.01) and thousand kernel weight (r=0.03, P<0.05), suggesting a very low possibility of prediction of the agronomic performance based on random SSR markers. The percentage of variability (measured by sum of squares) explained by the environment varied between 76.3 and 98.5% depending on the trait, while that explained by genotypes ranged between 0.4 and 12.6%, and that explained by the GE interaction ranged from 1.1 to 12.5%. The clustering of the accessions based on multivariate phenotypic data offered the best explanation of genotypic differences, accounting for 30.3% (for yield) to 75.1% (for kernel weight) of the observed variation. The genotype×environment interaction was best explained by the phenotypic univariate clustering procedure, which explained from 28.5% (for kernel weight) to 74.9% (for days to heading) of variation. The only accessions that clustered both in the genetic dissimilarities tree and the tree obtained using Euclidean distances based on standardized phenotypic data across environments were those closely related to the CIMMYT hallmark founder 'Altar 84', the ICARDA accessions adapted to continental-dryland areas, and the landraces, suggesting that genetic proximity corresponded to agronomic performance in only a few cases. © 2010 Elsevier B.V.
Authors & Co-Authors
Royo, Conxita
Spain, Caldes de Montbui
Institut de Recerca I Technologia Agroalimentaries
Maccaferri, Marco
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Álvaro, Fanny
Spain, Caldes de Montbui
Institut de Recerca I Technologia Agroalimentaries
Moragues, Marc
Spain, Caldes de Montbui
Institut de Recerca I Technologia Agroalimentaries
Sanguineti, Maria Corinna
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Tuberosa, Roberto
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Maalouf, Fouad S.
Lebanon, Fanar
Institut de Recherches Agronomiques Libanais
Moral, Luis F.García del
Spain, Granada
Universidad de Granada
Demontis, Andrea
Italy, Bologna
Società Produttori Sementi Bologna
Rhouma, Sayar
Tunisia, Tunis
University of Carthage, Institut National de la Recherche Agronomique de Tunisie
Nachit, Miloudi Mikael
Lebanon, Beirut
International Center for Agricultural Research in the Dry Areas Syria
Nserallah, Nasserlehaq
Morocco, Settat
Centre Régional de la Recherche Agronomique de Settat
Villegas, Dolors
Spain, Caldes de Montbui
Institut de Recerca I Technologia Agroalimentaries
Statistics
Citations: 57
Authors: 13
Affiliations: 8
Identifiers
Doi:
10.1016/j.fcr.2010.06.020
Research Areas
Genetics And Genomics
Study Design
Cross Sectional Study