Phenotypic and genotypic analyses of diversity and breeding progress in European triticale (× Triticosecale Wittmack)

• Published in: Plant breeding 2017-02, Vol.136 (1), p.18-27
• Main Authors: Losert, Dominik, Maurer, Hans Peter, Marulanda, José J., Würschum, Tobias, Friedt, W.
• Format: Article
• Language: English
• Subjects: breeding progress; European triticale; Genetic diversity; Grain; phenotypic variation; Population structure; yield trend
• ISSN: 0179-9541; 1439-0523
• DOI: 10.1111/pbr.12433

Knowledge of the extent of phenotypic variability, genetic diversity and the realized breeding progress is central for the optimum design of breeding programmes, but little information is available for triticale (× Triticosecale Wittmack). In this study, a collection of 885 diverse European triticale lines was evaluated in multilocation field trials in 2 years. We observed significant genotypic variances and high heritabilities for several agronomic and morphological traits and significant correlations among different traits including grain yield. Based on a subset of the population of 121 varieties registered in Europe between 1983 and 2014, we observed a substantial breeding progress for grain yield with a significant rate of increase of 53 kg/ha or 0.67% per year. All lines were genotyped by a genotyping‐by‐sequencing approach yielding 58 888 polymorphic markers. Our analyses revealed the absence of major population structure but a certain grouping of lines according to their origin. Taken together, our results on triticale germplasm and its breeding history provide important information for breeding programmes and future selection gain in this crop.