Genetic analysis of some chemical traits in burley tobacco

Four parent burley tobacco cultivars (TN 86, BL1, Hy 71 and Poseydon), and their six F-1 hybrids (Hy 71 x TN 86, Hy 71 x BL1, Hy 71 x Poseydon, Poseyd on x BL1, Poseydon x TN 86 and TN 86 x BL1) were separated for the needs of this study. Selected materials from a four-year trial, set up according to the RCBD in four replications, were used to study the manner of inheritanc e of nicotine, proteins, total nitrogen and ash content by means of the com ponents of genetic variance and regression analysis. According to the compo nents of genetic variance, the significant additive variance was estimated for nicotine, proteins and ash content, while the significant additive and nonadditive variance were estimated for total nitrogen content. Other resul ts point to the presence of overdominant inheritance for all the traits stu died, but not for all investigation years, as well as to the preponderance of dominant genes over recessive genes, however not of their symmetric dist ribution.