Abstract
Inbred lines extracted by single seed descent (129 SSD families) and by dihaploidy (60 DH families) from a cross of a flue cured (SCR) and an air cured burley (S3) variety of tobacco have been compared in a completely randomised experiment at two planting densities (normal and double) for 11 characters including yield. The basic generations (parental varieties, F1, F2 and first backcrosses, B1 and B2) were also included to provide contemporary genetical controls.
Half the characters show no difference in mean between the SSD and DH samples of inbred lines and the majority (nine out of 11) show no difference in genetical variance. For most characters there is no suggestion that the DH sample is showing the widely reported reduction in vigour relative to the SSD sample and the original parental varieties. Indeed the DH mean is the larger, implying greater vigour in more than half the cases where the DH and SSD sample means differ significantly. It is quite clear, therefore, that the relationship between the properties of the SSD and DH samples of inbred lines differs widely between characters.
Leaving aside non-genetical explanations, the means of the inbred lines and the mean of the original parental varieties (mp) are expected to differ only in the presence of non-allelic interaction whereas the means of the SSD and DH samples of lines are expected to differ only if there is a linkage disequilibrium involving these interacting genes. Within the limitations of the genetical analyses of the basic generations these expectations are borne out.
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Jinks, J., Chowdhury, M. & Pooni, H. Comparison of the inbred lines derived from a hybrid of tobacco (burley × flue cured) by dihaploidy and single seed descent. Heredity 55, 127–133 (1985). https://doi.org/10.1038/hdy.1985.79
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DOI: https://doi.org/10.1038/hdy.1985.79
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