Exploitation of heterosis and combining ability for earliness and vegetative traits in ridge gourd
× additive interaction effect which represents the
Table 3. Analysis of sca effects for the character days
fixable components of genetic variance. Apparently,
to first female flower revealed that out o 28 crosses,
parents with good GCA effects may be presumed
13 exhibited significant sca effects, where 9 were
to possess more favourable genes for the concerned
with negative values. The highest negative effect
traits. These above results are in accordance with the
were shown by the cross PRG 131 X PRG 132 (-3.20)
findings by Shaha et al. , (1999) and Rao et al. , (2000a)
followed by PCPGR 7256 X PRG 131 (-2.07) and PRG
in ridge gourd. The specific combining ability (sca)
142 X PRG 132 (-2.00. 14 crosses showed significant
effects of crosses for all characters are presented in
effects for node number to first female flower out of
Table 3. Estimates of specific combining ability effects of crosses for different traits in ridge gourd
Days to first
Node number to Ist
Vine
No. of primary
Days taken to Ist
Crosses
female flower
female flower
length (m)
branches
fruit harvesting
PCPGR 7256 X PRG 117
2.60**
2.17**
1.54**
0.76*
2.27**
PCPGR 7256 X PRG 142
5.80**
-4.16**
-0.30**
1.02**
6.44**
PCPGR 7256 X PRG 131
-2.07**
0.94*
1.03**
-0.61*
-0.16
PCPGR 7256 X PRG 137
-1.40*
4.54**
-0.51**
-0.88**
-1.10
PCPGR 7256 X PRG 132
-1.64*
-1.70**
0.72**
0.22
-1.13*
PCPGR 7256 X PRG 120
0.03
0.20
-0.11
-0.21
1.04
PCPGR 7256 X PRG 7
-0.97
-1.26**
0.10
0.06
-0.23
PRG 117 X PRG 142
-1.77**
0.04
-0.58**
0.62*
-0.73
PRG 117 X PRG 131
-1.30*
-3.20**
-0.58**
0.32
-0.33
PRG 117 X PRG 137
-0.64
-2.60**
0.10
0.72*
0.07
PRG 117 X PRG 132
-1.87**
-1.16**
0.00
-0.84**
-2.30**
PRG 117 X PRG 120
-0.54
0.07
0.79**
-0.28
-1.46*
PRG 117 X PRG 7
-0.54
-0.06
-0.12
-0.68*
-1.73**
PRG 142 X PRG 131
-1.77**
0.80
-0.47**
-0.74*
-2.50**
PRG 142 X PRG 137
-0.77
-1.26**
0.13
0.32
-1.43*
PRG 142 X PRG 132
-2.00**
0.84
-0.21*
-0.24
-2.46**
PRG 142 X PRG 120
-0.34
-0.26
-0.28**
-0.01
-0.96
PRG 142 X PRG 7
0.00
-0.06
0.31**
-0.08
-0.56
PRG 131 X PRG 137
-0.64
-0.83
0.55**
0.02
-0.70
PRG 131 X PRG 132
-3.20**
-1.40**
0.53**
0.79*
-3.06**
PRG 131 X PRG 120
0.46
-0.16
-0.90**
-0.31
0.77
PRG 131 X PRG 7
-0.20
0.04
0.44**
0.62*
0.84
PRG 137 X PRG 132
3.80**
2.20**
-0.64**
-0.14
3.67**
PRG 137 X PRG 120
1.80**
-0.56
-0.63**
-0.91**
0.84
PRG 137 X PRG 7
-0.87
1.64**
1.03**
0.02
-0.76
PRG 132 X PRG 120
-0.77
-0.80
0.27**
1.86**
-0.20
PRG 132 X PRG 7
1.23
0.07
-0.62**
-0.21
0.87
PRG 120 X PRG 7
0.23
1.30**
-0.71**
0.36
0.70
SE (Sij)
1.68
1.15
0.23
0.80
1.53
* significant at 0.05 levels of probability
** significant at 0.01 levels of probability
157