Abstract
Brassica napus L. is the leading European oilseed crop and has therefore a high economical importance. The objectives of our study were to examine (1) the patterns of phenotypic diversity in a species-wide B. napus germplasm set of 518 inbreds with respect to various seedling development, agronomic, and seed quality traits as well as (2) the interrelationship of the examined traits and their use in selection on correlated traits. The B. napus germplasm set was evaluated in greenhouse and field trials for several seedling development, agronomic, and seed quality traits. The traits were highly correlated within the individual trait categories and moderately correlated between the different trait categories. We observed differences in phenotypic diversity among the examined eight germplasm types. The reduction of phenotypic diversity was on average more pronounced for the seedling development traits than for the agronomic and seed quality traits, suggesting that plant breeders need to introgress new genetic variation with respect to the former.
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Acknowledgments
The authors thank the breeding companies Deutsche Saatveredelung AG, KWS SAAT AG, Limagrain GmbH, and Norddeutsche Pflanzenzucht for performing the winter trials. Furthermore, we would like to thank Wolfgang Ecke (University of Göttingen, Germany), the Leibniz Institute of Plant Genetics and Crop Plant Research, Gatersleben (Germany), Nordic Gene Bank, Alnarp (Sweden), the Centre for Genetic Resources (Netherlands), and Warwick Horticulture Research International Genetic Resources Unit (UK) for providing the seeds of the examined germplasm. This research was funded by the Deutsche Forschungsgemeinschaft and the Max Planck Society. It was performed in the framework of the ERA-NET PG project “ASSYST”. We are deeply grateful to Andrea Lossow, Nele Kaul, Annika Legerlotz, Bent Müller, Frank Eikelmann, and Andreas Lautscham for excellent technical assistance. Finally, the authors thank the associate editor C. Quiros and three anonymous reviewers for their valuable suggestions.
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Körber, N., Wittkop, B., Bus, A. et al. Seedling development in a Brassica napus diversity set and its relationship to agronomic performance. Theor Appl Genet 125, 1275–1287 (2012). https://doi.org/10.1007/s00122-012-1912-9
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DOI: https://doi.org/10.1007/s00122-012-1912-9