Changes in alleles frequencies of markerloci linked to yield quantitative trait loci (QTL) werestudied in 188 barley entries (landraces, old andmodern cultivars) grown in six trials representing lowand high yielding conditions in Spain (2004) and Syria(2004, 2005). A genome wise association analysis wasperformed per trial, using 811 DArT markers ofknown map position. At the first stage of analysis,spatially adjusted genotypic means were created pertrial by fitting mixed models. At the second stage,single QTL models were fitted with correction forpopulation substructure, using regression models.Finally, multiple QTL models were constructed bybackward selection from a regression model containingall significantmarkers from the single QTL analyses. Inaddition to the association analyses per trial, genotypeby environment interaction was investigated across thesix trials. Landraces seemed best adapted to lowyielding environments, while old and modern entriesadapted better to high yielding environments. Thenumber of QTL and the magnitude of their effects werecomparable for low and high input conditions. However,none of the QTL were found within a given bin atany chromosome in more than two of the six trials.Changes in allele frequencies of marker loci close toQTL for grain yield in landraces, old and modernbarley cultivars could be attributed to selection exercisedin breeding, suggesting that modern breeding may have increased frequencies of marker alleles closeto QTL that favour production particularly under highyield potential environments. Moreover, these resultsalso indicate that there may be scope for improvingyield under low input systems, as breeding so far hashardly changed allele frequencies at marker loci closeto QTL for low yielding conditions.
|Anno di pubblicazione:||2008|
|Titolo:||Changes in allele frequencies in landraces, old and modern barley cultivars of marker loci close to QTL for grain yield under high and low input conditions.|
|Autori:||Pswarayi A; van Eeuwijk FA; Ceccarelli S; Grando S; Comadran J; Russell JR; Stanca M; N. Pecchioni; Tondelli A; Akar T; Al-Yassin A; Benbelkacem A; Ouabbou H; Thomas WTB; I Romagosa|
|Appare nelle tipologie:||Articolo su rivista|
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