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Prediction of means and variances of crosses with genome-wide marker effects in barley

Zugehörigkeit
Institute of Agronomy and Plant Breeding II, Justus Liebig University, Gießen, Germany
Osthushenrich, Tanja;
Zugehörigkeit
Institute of Agronomy and Plant Breeding II, Justus Liebig University, Gießen, Germany
Frisch, Matthias;
Zugehörigkeit
Institute of Agronomy and Plant Breeding II, Justus Liebig University, Gießen, Germany
Zenke-Philippi, Carola;
Zugehörigkeit
Saatzucht Josef Breun GmbH & Co. KG, Herzogenaurach, Germany
Jaiser, Heidi;
Zugehörigkeit
Syngenta Seeds GmbH, Bad Salzuflen, Germany
Spiller, Monika;
Zugehörigkeit
W. von Borries-Eckendorf GmbH & Co. KG, Leopoldshöhe, Germany
Cselényi, László;
Zugehörigkeit
Limagrain GmbH, Edemissen, Germany
Krumnacker, Kerstin;
Zugehörigkeit
Ackermann Saatzucht GmbH & Co. KG, Irlbach, Germany
Boxberger, Susanna;
GND
1059141396
Zugehörigkeit
Julius Kühn-Institute (JKI), Institute for Resistance Research and Stress Tolerance, Germany
Kopahnke, Doris;
GND
1059141299
Zugehörigkeit
Julius Kühn-Institute (JKI), Institute for Resistance Research and Stress Tolerance, Germany
Habekuß, Antje;
GND
172295300
Zugehörigkeit
Julius Kühn-Institute (JKI), Institute for Resistance Research and Stress Tolerance, Germany
Ordon, Frank;
Zugehörigkeit
Institute of Agronomy and Plant Breeding II, Justus Liebig University, Gießen, Germany
Herzog, Eva

Background: The expected genetic variance is an important criterion for the selection of crossing partners which will produce superior combinations of genotypes in their progeny. The advent of molecular markers has opened up new vistas for obtaining precise predictors for the genetic variance of a cross, but fast prediction methods that allow plant breeders to select crossing partners based on already available data from their breeding programs without complicated calculations or simulation of breeding populations are still lacking. The main objective of the present study was to demonstrate the practical applicability of an analytical approach for the selection of superior cross combinations with experimental data from a barley breeding program. We used genome-wide marker effects to predict the yield means and genetic variances of 14 DH families resulting from crosses of four donor lines with five registered elite varieties with the genotypic information of the parental lines. For the validation of the predicted parameters, the analytical approach was extended by the masking variance as a major component of phenotypic variance. The predicted parameters were used to fit normal distribution curves of the phenotypic values and to conduct an Anderson-Darling goodness-of-fit test for the observed phenotypic data of the 14 DH families from the field trial. Results: There was no evidence that the observed phenotypic values deviated from the predicted phenotypic normal distributions in 13 out of 14 crosses. The correlations between the observed and the predicted means and the observed and predicted variances were r = 0.95 and r = 0.34, respectively. After removing two crosses with downward outliers in the phenotypic data, the correlation between the observed and predicted variances increased to r = 0.76. A ranking of the 14 crosses based on the sum of predicted mean and genetic variance identified the 50% best crosses from the field trial correctly. Conclusions: We conclude that the prediction accuracy of the presented approach is sufficiently high to identify superior crosses even with limited phenotypic data. We therefore expect that the analytical approach based on genome-wide marker effects is applicable in a wide range of breeding programs.

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Rechteinhaber: 2018 Osthushenrich, Frisch, Zenke-Philippi, Jaiser, Spiller, Cselényi, Krumnacker, Boxberger, Kopahnke, Habekuß, Ordon and Herzog.

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