Cotton Genomics and Genetics 2015, Vol.6, No.4, 1-7
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Number of sympodial branches showed negative
association with monopodial branches and 100 seed
weight but had positive correlation with seed cotton
yield, GOT, plant height, number of bolls, fibre
length and fibre strength. It clearly depicts that
number of sympodial branches is yield contribution
trait not only for seed cotton yield but also for fibre
length and strength. The sufficient increase in yield
had been proved by the research findings of Badr
(2003), Iqbal et al.
(2006), Wang et al
.
(2004) and
Salahuddin et al
.
(2010). Hussain et al.
(2010) and
Natera et al. (2012) found positive association of
sympodial branches and number of bolls.
Fibre fineness is the promising trait which is much
bothered by textile industry. Fibre fineness had positive
correlation with monopodial branches and 100 seed
weight. But showed strong negative correlation with
seed cotton yield, 100 seed weight, plant height and
fibre length. Whereas, fibre fineness and fibre strength
had negative correlation between them. Increasing
trend of fibre fineness will lead toward decreasing
trend of seed cotton yield.
Fibre length had strong positive correlation with seed
cotton yield, plant height and fibre strength whereas
negative correlation with monopodial branches, GOT
and fibre fineness. It is clear that if we are planned to
enhance fibre length, strength and fineness than we
must have to be very careful in breeding program. Fibre
strength showed positive association with seed cotton
yield, fibre strength and number of bolls. Fibre strength
showed negative association with monopodial branches,
plant height, GOT and fibre fineness. Ahuja et al
.
(2006)
found negative association between seed cotton yield
and fibre strength.
Path Coefficient Analysis
Purpose of path coefficient analysis is to find out the
influence of dependent variables on seed cotton yield.
These effects are in shape of direct or indirect effects.
The results showed that seed cotton yield had experience
positive effects form number of monopodial branches
(0.060), GOT (0.145), plant height (1.175), number of
sympodial branches (0.014) and fibre strength (0.0.534),
directly. But only plant height, fibre strength and GOT
showed some good effects. (Baloch et al., 2009) and
(Kerademir et al., 2009) authenticated same results,
whereas, Rasheed et al., (2009) were in favour of
GOT and fibre strength. Natera et al., (2012) also
proved the significant positive effect of fibre strength
on seed cotton yield. Magadum et al
.
(2010), Ahuja
and Dhyal (2007), Salahuddin et al
.
(2010) and Afiah
and Ghoneim (2000) authenticate strong positive
effect of sympodial branches on yield, but here in this
research its values are just confine to small percentage,
this may be due to small genotypic correlation
between seed cotton yield and sympodial branches.
Weight of 100 seeds, fibre fineness and fibre length
had negative direct effect on seed cotton yield i.e.,
-0.692, -0.936 and -0.232, respectively. Same results
were authenticated by Natera et al
.
(2012) and
Rasheed et al. (2009). Whereas, research study of
Magadum et al. (2010) and Rasheed et al. (2009) was
in favour of direct positive effect of fibre fineness on
seed cotton yield.
Heritability
Heritability was highest for fibre strength (99.3)
followed by number of sympodial branches (99.757),
plant height (97.616), fibre fineness (96.738) and
GOT (94.86). Whereas, lowest heritability value was
of number of monopodial branches (70.354). Same
results of h
2
bs
was in the finding of Hussain et al.
(2010). Rasheed et al.
(2009) proved high h
2
bs
value
for fibre strength, fibre fineness and GOT in his studies.
Conclusion
Overall there was good performance of hybrids and
high heritability indicates that selection would be easy.
Yield and fibre traits cannot be enhanced simultaneously.
We can maximize yield by focusing on plant height,
fibre strength and GOT. These traits are very responsive
toward selection.
Materials and Methods
The study was conducted in the research area of the
Department of Plant Breeding and Genetics, University of
Agriculture, Faisalabad, Pakistan. Five parent cultivars
were grown in glasshouse under controlled condition
in October, 2012. Temperature in glasshouse was
maintained approximately at 35
℃
. Parent cultivars
used in the study are listed in the following:
B557
FH 153
CRS 2007
KZ 191
S 12
