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Cotton Genomics and Genetics
36
Table 1 Analysis of variance for combining ability of Line x Tester inter specific crosses for different quantitative characters
Source
d.f.
Mean sum of squares
Seed cotton
yield (kg/ha)
Plant
height
(cm)
No.
of
sympodia
No.
of
bolls
Mean boll
weight (g)
Seed
index
(g)
Ginning
outturn
(%)
Lint
index
(g)
1
2
3
4
5
6
7
8
Replications
1
1464781.85** 1722.35 198.14** 94.58** 2.29**
37.90** 12.28
1.85*
Crosses
91 365118.66** 722.32 13.58
43.03** 0.23**
2.56** 13.51** 0.95**
Line Effect
3
1344213.43** 705.20 0.99
56.37
0.61*
1.94 7.76
0.63
Tester Effect
22 903079.19** 541.25 11.19
45.34
0.28
3.86* 20.30* 1.46*
Line x Tester Effect
66 141294.17** 783.46 14.95
41.65** 0.20**
2.16** 11.51** 0.80**
Error
91 47434.74
831.52 12.26
1.94
0.04
0.74 3.45
0.36
Table 2 Variance due to general and specific combining ability for different quantitative characters
Sl. No.
Characters
Variance Due to GCA
Variance Due to SCA
GCA/SCA
1
Plant height (cm)
11.49800
6463.54050
0.00275
2
No. of sympodia
0.01625
123.35975
0.00000
3
No. of bolls
0.91925
343.62825
0.00275
4
Mean boll Weight (g)
0.01025
1.65775
0.00675
5
Seed index (g)
0.03150
17.79225
0.00175
6
Ginning outturn (%)
0.12650
94.93500
0.00100
7
Lint index (g)
0.01050
6.56300
0.00150
8
Seed cotton yield (kg/ha)
21916.52625
1165676.92500
0.01700
1.1.2 Combining ability effects
The estimates of general combining ability effects of
females and males are presented in Table 3 for all the
characters.
1.1.3 Seed cotton yield (kg/ha)
The estimates of
gca
effects of tester parents in the
population based crosses were found to be significant
differences for sixteen testers, of which ten testers
recorded positive significant
gca
effects and the tester
DH 98-27 showed maximum value of
gca
effect for
seed cotton yield trait (333.42). Three barbadense
lines recorded significant
gca
effects, of which two
lines exhibited positive significant
gca
effects
recorded by the line DB 533 (242.92) and DB 534
(75.54).
1.1.4 Plant height (cm)
The estimates of general combining ability effects
among hirsutum testers recorded significant negative
value in the tester DH 75- 23 (-21.36) and the highest
positive
gca
effect was exhibited by the tester DH
45-23 (9.60). All four barbadense lines exhibited not
significant
gca
effects and the line DB 531 showed
highest positive
gca
effect (2.88).
1.1.5 Number of sympodia per plant
The estimates of general combining ability effects
indicated not significant differences among all
hirsutum testers and four barbadense lines.
1.1.6 Number of bolls per plant
Out of the 23 testers, 15 testers showed significant
gca
effects for number of bolls per plant. ZCH 8 (2.02),
DH 37-4 (1.62), DH 8-7 (1.85), DH 29-1 (1.33), DH
35-17 (5.29), DH 13-7 (1.49) and DH 23-21 (5.18)
exhibited significant positive
sca
effects in the
desirable direction, whereas testers DH 18-31 (-3.25),
178-24 (-3.34), DH 24-4 (-2.38), DH 11-8 (- 1.03),
DH 23-4 (-3.19), DH 75- 23 (-2.63), DH 91-1 (-2.38)
and DH 45-23 (-1.23) showed significant negative
gca
effects in desirable direction. Out of 4 lines, three
lines exhibited significant
gca
effects in desirable
direction, the lines DB 534 and DB 532 exhibited
positive significant
gca
effects 1.06 and 0.52
respectively. While the line DB 533 (-1.51) recorded
significant negative
gca
effect.
1.1.7 Mean boll weight (g)
The estimates of
gca
effects of tester parents in the
population based crosses were found to be significant
in twelve testers, out of which six were positive
Cotton Genomics and Genetics