Legume Genomics and Genetics 2014, Vol.6, No.1, 1-11
2
be used to identify the lines to be served as parents in a
breeding program for further improvement (Kearsey
and Pooni, 1996). In addition, this technique enables
the breeder to combine desirable genes that are found
in two or more genotypes (Dabholkar, 1992). Genetic
parameters like narrow sense heritability and degree of
dominance for seed yield and other quantitative traits
were also estimated in this study.
Results
The analysis of variance for combining ability for
yield and its attributing characters are presented in
Table 2. The analysis of variance revealed significant
differences existed among the parents and crosses for
all the traits under studied in advanced generation like
F
1
. Due to segregating behaviour of the crosses the
possible options of significant differences for
genotypes arose for these traits under studied. The
ANOVA revealed that mean squares due to genotypes
were distinctly significant for all the yield attributing
traits under evaluation indicating presence of
sufficient amount of variability among the parents and
among the crosses. The percentage of heritability in
broad sense was highest with days to maturity
(94.78%) followed by days to 50% flowering
(94.67%). The heritability narrow sense was highest
with number of number of seeds/pod (29.69%)
followed by pod length (27.95%) (Table 4).
Days to 50% flowering
In the present study the genotypes for lowest days to
flowering was exhibited by PU-35 (33.46) followed
by LBG-17 (34.69) whereas highest days to 50%
flowering was recorded with B-3-8-8 (39.56) followed
by Keonjhar Local (39.03) and PU-30 (37.70) (Table
5). Out of 8 parents 4 parents exhibited positive
gca
effect (3 were significant) for this character whereas
rest 4 parents exhibited negative
gca
effect (3 were
significant). PU-30 (-0.39) and PU-35 (-0.38) had the
lowest general combining ability effect. Whereas
positive and significant
gca
effect was exhibited by
Keonjhar Local (0.35) followed byLBG-17 (0.30) for
this character a low
gca
signifies early maturity (Table
6). For days to 50 % flowering hybrid TU-94-2 ×
Keonjhar Local was adjudged as earliest crosses
among all with a mean of 32.36 days to flower 50%
followed by PU-30 × Keonjhar Local (32.99).
OBG-31 ×Keonjhar Local (38.14) was having the
maximum period to flower 50% of the total masses
(Table 7).The estimates of
sca
effects ranged from
-2.76 to 2.32. The best specific combiners for early
flowering were B-3-8-8×Keonjhar local (-2.76)
followed by PU-30×Keonjhar Local (-2.71) and
PU-30×OBG-31 (-2.30) (Table 8). This indicated that
these crosses in combination with other parents could
result in an early maturity. This is desirable since a
negative
sca
signifies early maturity.
Days to maturity
Early maturing genotype was LBG-17 (68.41)
followed by PU-35 (68.99) whereas Keonjhar Local
was having the highest maturity period of 77.13 days
followed by PU-30 (77.04) and B-3-8-8 (76.13) (Table
5). Out of 8 parents 5 parents exhibited positive
gca
effect (3 were significant) for this character whereas
other 3 parents exhibited negative
gca
effect (2 were
significant). TU-94-2 (-0.72) followed by OBG-31
(-0.59) had the lowest general combining ability effect
for days to maturity.PU-30 would be the best general
combiner for this character because we expect
negative
gca
for the expression of days to maturity
(Table 6). PU-35×Keonjhar Local took longest period
to mature (75.64) followed by B-3-8-8×OBG-31
(75.58) and OBG-17×TU-94-2 (75.47). The earliest
maturing cross was OBG-17×OBG-31 (67.96)
followed by TU-94-2×Keonjhar Local (68.37). So the
crosses with early maturing are desirable rather as
compared to the late maturing one (Table 7). Among
the 28 F
1
hybrids highest positive
sca
was recorded
with
B-3-8-8×OBG-31
(3.20)
followed by
OBG-17×TU-94-2 (3.00). For this character negative
sca
is desirable so significant negative
sca
effects
were exhibited by PU-30×Keonjhar Local (-4.71)
followed
byOBG-17×OBG-31
(-4.64)
and
TU-94-2×Keonjhar Local (-4.09) (Table 8).
Plant Height
For plant height minimum plant height was recorded
with TU-94-2 (21.00) followed by LBG-17 (21.83).
B-3-8-8 (24.68) was having maximum plant height
followed by PU-35 (24.37) and OBG-17 (23.72)
(Table 5). Keonjhar Local (0.55) adjudged as the best
combiner for this trait with significant positive
gca
effect followed by OBG-31 (0.45) whereas for plant
height lowest calculated
gca
was viewed by TU-94-2
(-0.93) followed by OBG-17 (-0.44) (Table 6). The
positive expression of
gca
for this character is
desirable. The plant height is an important traitby
