Heterosis and combining ability analysis of some quantitative characters in Turkish tobacco
1995
Kara, S.M. (Karadeniz Technical Univ. Faculty of Agriculture, Ordu (Turkey)) | Esendal, E. (Trakya Univ. Faculty of Agriculture, Tekirdag (Turkey))
Six Turkish tobacco cultivars and their 15 F1 hybrids, excluding reciprocals, were evaluated for five agronomic and four chemical traits. With the exception of ash content, average heterosis was significant for all characters studied. The average yield of hybrids was 15.2% above that of the parents. Number of leaves per plant, total alkaloid and total sugar exhibited negative heterotic effects. The analysis of combining ability revealed that the variances of GCA were significant for all traits evaluated. On the other hand, variances of SCA were significant for ash content, total nitrogen, total alkaloid and for total sugar, indicating that non-additive gene action was important as well for these traits. A comparison of the relative magnitudes of the GCA and SCA variances suggests that the attributes, except total nitrogen, were governed more by additive gene action than by dominance. The line 40-18B was identified as being the most suitable combiner overall parent in the experiment for improving the characters investigated. Based on significant SCA effects, together with significant heterotic estimates, the crosses 3x4, 3x6, and 2x3 would be suitable combinations
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