Testcross performance of new breeding lines of flue-cured tobacco for morphological and agronomic traits
In 2014 a field trial with ten new breeding lines of flue-cured tobacco, their test-hybrids with two line testers, and two controls, standard varieties widespread in the commercial production, was set up at three locations (Virovitica, Kutjevo1 and Kutjevo2) in Croatia. The cultural practices at all three locations were as recommended for commercial flue-cured tobacco production. At the location Kutjevo2 irrigation was additionally included. During vegetation, plant height, number of days to flowering, number of leaves per plant, 9th leaf length (L) and width (W), L/W ratio and the leaf area were assessed. After harvesting and curing leaf yield, average price and value/ha were determined. Analysis of variance revealed significant differences among genotypes for all the analysed traits except for number of leaves per plant. At the irrigated location (Kutjevo2) the average yield and value were significantly higher as compared with two no irrigated locations. Genotype by location interaction was significant for all traits except for number of leaves per plant, L/W ratio and value. Several lines and hybrids had significantly higher yield, price and value as compared to the standards. General combining ability (GCA) of the experimental lines was significant for all the traits except for plant height, L/W ratio and price and, GCA of testers was significant for all the traits except for plant height, L, yield and value. Specific combining ability of test-hybrids was significant only for width and area of the ninth leaf.