Assessment of Components of Genetic Variance of Some Quantitative Traits in Sunflower (Helianthus annuus L.)

R. MARINKOVIC, J. JOKSIMOVIC, D. JOVANOVIC and A. MARJANOVIC-JEROMELA
Institute of Field and Vegetable Crops, 21000 Novi Sad, M. Gorkog 30, Serbia and Montenegro

Abstract

MARINKOVIC, R., J. JOKSIMOVIC, D. JOVANOVIC and A. MARJANOVIC-JEROMELA, 2004. Assessment of components of genetic variance of some quantitative traits in sunflower (Helianthus annuus L.). Bulg. J. Agric. Sci., 10: 539-547

Seven F1 hybrids obtained by crossing five sunflower inbred lines were used to analyze the impact of genes with additive and dominant effects and their interactions on the inheritance of plant height, leaf number per plant and head diameter. The linkage among the expected progeny means was tested using the scaling tests method (Mather, 1949), while the estimates of gene effects and mode of inheritance were made by Generation Mean Analysis (Mather and Jinks, 1982). The additive-dominant model proved adequate only for leaf number per plant in crosses C5 and C7. Besides the main gene effects (additive and dominant), epistatic gene effects were also of great importance in the inheritance of all three traits. In the inheritance of plant height, duplicate epistasis between dominant increasers was found in C2, while C1, C4 and C7 had duplicate epistasis between dominant decreasers. In the case of leaf number per plant, we only found duplicate epistasis between dominant decreasers in C1, C3 and C6, while in the inheritance of head diameter both types of duplicate epistasis were found, namely duplicate epistasis between dominant decreasers in C1 and duplicate epistasis between dominant increasers in C2.

Key words: genetic variance, sunflower, inbred lines, epistasis