engleski

Quantitative parameters of some burley tobacco traits

The purpose of this study was to determinate manner of inheritance, heritability, heterosis and inbreeding in burley tobacco for days to flowering, topping height, number of leaves, yield and grade index. Four parental cultivars and their F1, F2,Bc1 and Bc2 progenies were studied in a four-year experiment carried out in the Northern Western Croatia. The experiment was organized as a RCBD with four replications. Larger nonadditive, than additive, variance was found for all the studied traits. Rather high values of h2b were determined for almost all traits whereas h2n was very low. Positive heterosis in F1 was found for topping height, number of leaves and yield, and negative for days to flowering and grade index. Also in F2, inbreeding was found for all the traits for which the positive heterosis in F1 was found. Distribution of parental genotypes along the expected regression line showed genetic divergence of the parental cultivars. The highest number of dominant genes were found for the TN 86 and of recessive for the BL1 and Hy 71.

Nicotiana tabacum L.; Burley; Cultivar; Inheritance; Heritability; Heterosis; Inbreeding; Agronomic and morphological traits

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