Linkage Disequilibrium Mapping of Yield and Yield Stability in Modern Spring Barley Cultivars

Overview

Journal Genetics

Publisher Oxford University Press

Specialty Genetics

Date 2004 Sep 30

PMID 15454555

Citations 153

Authors

Arnold T W Kraakman

Rients E Niks

Petra M M M Van den Berg

Piet Stam

Fred A van Eeuwijk

Affiliations

Soon will be listed here.

Abstract

Associations between markers and complex quantitative traits were investigated in a collection of 146 modern two-row spring barley cultivars, representing the current commercial germ plasm in Europe. Using 236 AFLP markers, associations between markers were found for markers as far apart as 10 cM. Subsequently, for the 146 cultivars the complex traits mean yield, adaptability (Finlay-Wilkinson slope), and stability (deviations from regression) were estimated from the analysis of variety trial data. Regression of those traits on individual marker data disclosed marker-trait associations for mean yield and yield stability. Support for identified associations was obtained from association profiles, i.e., from plots of P-values against chromosome positions. In addition, many of the associated markers were located in regions where earlier QTL were found for yield and yield components. To study the oligogenic genetic base of the traits in more detail, multiple linear regression of the traits on markers was carried out, using stepwise selection. By this procedure, 18-20 markers that accounted for 40-58% of the variation were selected. Our results indicate that association mapping approaches can be a viable alternative to classical QTL approaches based on crosses between inbred lines, especially for complex traits with costly measurements.

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