Heterosis and combining ability of certain chemical traits in burley tobacco
2000
Butorac, J. (University of Zagreb (Croatia). Faculty of Agriculture)
Four parent burley tobacco cultivars and their F1, F2, Bc1 and Bc2 progenies were included in a four-year trial. The aim of these studies was to estimate the manner of inheritance of chemical traits (nicotine, proteins, total nitrogen and ash content). Medium to high broad-sense heritability, but also very low narrow-sense heritability, were estimated for most of the traits tested. Negative heterosis was estimated relative to better parent, and in some cases also to mid-parent. Negative inbreeding was recorded for nicotine and total nitrogen, and positive for ash content. Significant GCA was estimated for all the traits tested, while significant SCA was recorded in one or two years, however not for all traits. Genotype Poseydon was the best in GCA, and Hy 71 x TN 86, Hy 71 x BL1 and Poseydon x BL1 were the best in SCA.
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