The GCA and SCA affirm that GCA estimates are owned to additive genes
whereas SCA are owned to dominant type of genes.
Also, bi-parental mating and inter-mate desirable segregates, beside suitable selection to accumulate favorable additive genes
could be the proposed methods for improving salt tolerance in safflower.
Specific combining ability estimates ([[??].sub.ij]) measures the effects of non additive genes
(CRUZ & REGAZZI, 1994), and some of them had outstanding negative values both 14th-severity and AUDPC (Table 3).
Hence, these characters need to be given more importance while selecting the breeding lines as they are controlled by additive genes
. Therefore, selection based on the characters, both yield attributes (number of productive tillers) as well as nutritional quality traits such as protein, fat, phytate phosphorus, calcium, iron and zinc content having high heritability coupled with high genetic advance as per cent of mean may bring about the desired improvement in yield as well as nutritional quality of pearl millet genotypes.
action: Additive genes
are those in which members of a gene pair have equal ability to be expressed.
Combining additive genes
for slow rusting type resistance to leaf and stripe rusts in wheat, p.
Linkage among additive genes
also might account for deviations from linearity.
(2010) found significance of GCA and SCA suggesting the importance of additive as well as dominant genes, nevertheless the ratio of GCA/SCA was greater than the unity further indicating the preponderance of additive genes
over the dominant ones in the inheritance of seed cotton yield, seed index and lint%.
Proposition 3.--Cyclical selection for a trait controlled by two additive genes
with equal effects resulting in sign-concordant environment leads to the following behavior of the system trajectories: in minus-concordant environment any trajectory with [x.sub.2] = [x.sub.3] at the initial state comes to the set [x.sub.1][x.sub.4] = 0 and [x.sub.2][x.sub.3] = 0.
Although both additive and dominance gene action were found significant in cross PS-Pop-1-1-4 x BD-Pop-1-2-3-3 but the magnitude of dominance was higher than additive genes
, showing that trait can be exploited for hybrid production effectively.
The greater values of inbreeding depression revealed that dominant or over dominant genes with decreasing effect advocated the expression of days to initial flowering, while less inbreeding depression in some [F.sub.2] hybrids may be due to additive genes
or incidence of trangressive segregants.