Abstract
Large random samples of inbred families extracted from the highly heterotic cross of varieties 2 and 12 of Nicotiana rustica by single seed descent (60 families) and pedigree inbreeding (784 families) have been compared for seven quantitative characters. As expected on theoretical grounds there were no differences in the phenotypic and genotypic properties of the inbred families ascribable to the method used for their extraction. The samples confirmed that inbred families which outperform the heterotic F1 can be readily extracted from it by either method.
The hierarchical structure of the pedigree inbred families allowed a more sophisticated genetical analysis than the simple structure of the single seed descent families. But while the more complex structure allowed the detection of repulsion linkage for five of the seven characters, non-allelic interaction was detected for only one of them. The pedigree inbred families do not, therefore, provide a sensitive test for the non-allelic interactions which are detected by analyses of alternative designs.
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Jinks, J., Pooni, H. Comparison of inbred lines produced by single seed descent and pedigree inbreeding. Heredity 53, 299–308 (1984). https://doi.org/10.1038/hdy.1984.89
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DOI: https://doi.org/10.1038/hdy.1984.89
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