Qamar Sufan*⁽¹⁾, Boulus Khoury⁽¹⁾ and Nizar Moalla⁽¹⁾

(1). Department of Field Crops, Faculty of Agricultural engineering, Tishreen University, Lattakia, Syria.

(* Corresponding author: Qamar Sufan, E-mail.: 123qamar456@gmail.com, Phone: 00963994870211)

Received:  22/12/2022        Accepted: 20/02/2023

Abstract: 

The experiment was carried out during the agricultural seasons 2021/2023 in a nursery at the Faculty of Agricultural engineering. Tishreen University- Lattakia- Syria. by the cultivation of three Tobacco genotypes {Prilep- Basma-  Shak Elbent}. Half diallel cross was made between different genotypes of tobacco. In The following season, an evaluation of the genotypes was performed. that were distributed according to the Randomized Complete Block Design (RCBD) with three replicates per treatment. To estimate the heterosis, general and specific combining ability, nature of gene action for: plant height, number of leaves, leaves length, leaves width, and length/ width ratio. The results show significant differences significantly for all traits, which refer to differ among the parents. The genetic analysis shows important both additive and dominant effects to heredity in all character studies. The variance ratio of GCA to SCA was more than one (1) for (plant height, leaf length, and leaf width), but this ratio appeared to be less than one for other studied traits (number of leaves and length/ width ratio). The (Basma and Shak Elbent) parents show high GCA for (plant height and leaf length) respectively, and the hybrid (Basma × Shak Elbent) shows the highest SCA of plant height and leaf length. The highest values for heterosis in this study it was for the height and leaves length to the cross (Basma × Shak Elbent) which is (2.486 and 2.356)% respectively.

Keywords: Genotypes, combining ability, heterosis, morphological characteristics, technological characteristics, tobacco, Nicotiana tabacum L.

Full paper in Arabic: pdf