Detection of linkage and pleiotropy between characters of Nicotiana tabacum using inbred lines produced by dihaploidy and single seed descent

• Published in: Heredity 1985, Vol.55 (3), p.327-333
• Main Authors: JINKS, J. L, POONI, H. S, CHOWDHURY, M. K. U
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Biological and medical sciences; Classical and quantitative genetics. Population genetics. Molecular genetics; Classical genetics, quantitative genetics, hybrids; Fundamental and applied biological sciences. Psychology; Generalities. Genetics. Plant material; Genetics and breeding of economic plants; Genetics of eukaryotes. Biological and molecular evolution; Nicotiana tabacum; Pteridophyta, spermatophyta; Vegetals
• ISSN: 0018-067X; 1365-2540
• DOI: 10.1038/hdy.1985.115

A method for detecting and distinguishing between pleiotropy and a linkage disequilibrium as causes of genetical correlations between pairs of characters is developed theoretically and its application illustrated by the analysis of 11 characters scored on material derived from a cross between a burley and a flue cured variety of tobacco raised at two planting densities. The method is based upon comparisons of the correlations in random samples of inbred lines extracted from the F sub(1) of a cross by dihaploidy and from the F sub(2) of the cross by single seed descent. On the basis of the significant difference of the correlation in the dihaploid and single seed descent samples from zero and from one another the pairs of characters can be divided into five categories corresponding with the presence or absence of either or both of pleiotropy and a linkage disequilibrium. Application to random samples of 60 dihaploid and 126 single seed descent families allows the unambiguous classification of most of the pairs of characters.