Basic HTML Version
Heterosis Performance Seed Cotton Yield Physiological Parameters F
1
Inter Specific Hybrids Cotton
66
Continuing table 3
Sl.No Crosses
Seed cotton
yield (kg/ha)
Photosynthesis rate
(μmol CO
2
m
-2
·s
-1
)
Stomatal conductance
(μmol m
-2
·s
-1
)
Transpiration rate
(mmol H
2
Om
-2
·s
-1
)
1
13
14
15
109 [DH 18-31 x (DB 533 x DB 534 F
4
IPS 48)] 2384.10
27.35
1.03
7.17
110 [DH 18-31 x (DB 533 x DB 534 F
4
IPS 13)] 2321.06
30.67
0.69
6.08
111 [DH 18-31 x (DB 533 x DB 534 F
4
IPS 6)]
2273.64
27.62
0.65
6.27
112 [DH 18-31 x (DB 533 x DB 534 F
4
IPS 8)]
2314.80
26.53
0.92
7.42
MRC6918
Bt
check
2060.56
28.78
0.76
6.47
DCH32
1998.67
24.15
0.35
5.18
Mean
1957.45
24.47
0.62
6.14
Max
2884.26
34.25
1.17
10.04
Min
1146.20
3.15
0.09
2.07
CV %
19.70
9.50
11.04
12.69
S.E
273.03
1.64
0.05
0.55
CD@ 5%
765.14
4.60
0.14
1.55
C.D. 1%
1011.98
6.09
0.18
2.05
1.3 Seed cotton yield (kg·ha
-1
)
Seed cotton yield values ranged from 1368.15 [DB
533 x DB 534 F
5
IPS 49] to 441.81 [DB 533 x DB
534 F
5
IPS 33] among males/ lines, 2503.93 [DH
98-27] to 1870.91 [178-24] among females/testers and
2884.26 [DH 98-27 X (DB 533 x DB 534 F
4
IPS 49)]
to 1146.20 [178-24 X (DB 533 x DB 534 F
4
IPS 33)]
among derived F
1
crosses.
Per cent heterosis of F
1
crosses over their respective
mid parental values ranged from 108.16 [DH 98-27 X
(DB 533 x DB 534 F
4
IPS 49)] to -38.94 [178-24 X
(DB 533 x DB 534 F
4
IPS 33)]. Thirty crosses showed
significant positive heterosis and only one cross
showed significant negative heterosis over their mid
parent. Majority of workers viz., Tuteja et al. (1996),
Doss and Kadambavanasundaram (1997), Siruguppa
and Parameswarappa (1998), Neelima (2002) and
Potdukhe (2002) also reported heterosis over mid
parent. The cross DH 98-27 X (DB 533 x DB 534 F
4
IPS 49) (39.97) recorded highest significant positive
heterosis over commercial check MRC 6918 and the
cross 178-24 X (DB 533 x DB 534 F
4
IPS 33) (-44.37)
exhibited lowest significant negative heterosis over
MRC 6918. Two crosses showed significant heterosis
in positive direction and two crosses showed
significant heterosis in negative direction over MRC
6918. In case of DCH 32 non
Bt
check, the cross DH
98-27 X (DB 533 x DB 534 F
4
IPS 49) (44.31)
showed highest significant positive heterosis over this
check, but the cross 178-24 X (DB 533 x DB 534 F
4
IPS 33) (-42.65) recorded lowest significant negative
heterosis value over DCH 32 commercial check. Two
crosses exhibited significant positive heterosis over
DCH 32 commercial check and only one cross
showed significant negative heterosis. Majority of
workers viz., Tuteja et al. (1996), Doss and
Kadambavanasundaram (1997),
Siruguppa and
Parameswarappa (1998), Neelima (2002) and
Potdukhe (2002) also reported heterosis over mid
parent.
1.4 Photosynthetic rate (µmol CO
2
m
-2
·s
-1
)
The photosynthetic rates of cotton leaves under a
given environmental conditions is a function of the
various biophysical and biochemical processes
involved during the diffusion of CO
2
from atmosphere
to chloroplast and the subsequent enzymatic reactions.
The values of photosynthetic rate ranged from 27.15
[DB 533 x DB 534 F
5
IPS 13] to 16.49 [DB 533 x DB
534 F
5
IPS 8] among males/ lines, 29.62 [178-24] to
21.20 [DH18-31] among females/testers and 34.25
[ZCH 8 X (DB 533 x DB 534 F
4
IPS 52)] to 3.15
[ZCH 8 X (DB 533 x DB 534 F
4
IPS 33)] among
derived F
1
crosses.
Per cent heterosis of F1s over their respective mid
parent values ranged from 74.56 [ZCH 8 X (DB 533 x
DB 534 F
4
IPS 52)] to -84.91 [ZCH 8 X (DB 533 x
DB 534 F
4
IPS 33)]. Fourty four crosses showed
significant positive heterosis and twenty crosses
showed significant negative heterosis over their mid
parent. The cross ZCH 8 X (DB 533 x DB 534 F
4
IPS
52) (18.97) recorded highest significant positive
Cotton Genomics and Genetics