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

摘要

Seven F_1 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 provedadequate only for leaf number per plant in crosses C_5 and C_7 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 C_2, while C_1, C_4 and C_7 had duplicate epistasis between dominant decreasers. In the case of leaf number per plant, we only found duplicate epistasis between dominant decreasers in C_1, C_3 and C_6, while in the inheritance of head diameter both types of duplicate epistasis were found, namely duplicate epistasis between dominant decreasers in C_1 and duplicate epistasis between dominant increaseis in C_2.