Evaluation of genetic variance components for some quantitative traits in rapeseed (Brassica napus L.)
2014
Three hybrid combinations obtained by crossing six winter rapeseed cultivars
were analyzed for the impact of genes with additive and dominant effects and
their interactions with inheritance of plant height and first lateral branch
height. The linkage among the expected progeny means was checked using the
scaling test method (Mather, 1949), while the estimates of genetic effects
and mode of inheritance was made by the Generation Mean Analysis (Mather and
Jinks, 1982). The additive dominant model did not prove adequate for plant
height in all three crosses, and for first lateral branch height in the
second and third cross. The inadequacy of the model showed epistatic gene
effects were also of large importance in the inheritance of these traits.
Duplicate epistasis for plant height inheritance was found in all three cross
combinations and for inheritance of height of the first lateral branch in
second and third cross combination. However, it should be emphasized that
duplicate epistasis among dominant positive genes occurred on plant height
inheritance in C1 and C3, and on inheritance of first lateral branch height
in C3. Duplicate epistasis among dominant negative genes occurred in C2 on
the mode of inheritance of both traits. [Projekat Ministarstva nauke
Republike Srbije, br. TR-31025]
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