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elationship SSR-Based Molecular Marker Cotton F
1
Inter Specific Hybrids Performance Seed Cotton Yield
26
Figure 2 Dendrograms derived from an unweighted pair group
method analysis (UPGMA) cluster analysis by using Nei’s
similarity coefficient based on SSR markers
The similarity coefficient values between the line DB
533 × DB 534 F
4
IPS 49 and the tester DH 98-27
showed 67%. It revealed that DB 533 × DB 534 F
4
IPS 49 was closely related to DH 98-27 with 67%
similarity between parents. The hybrid between DB
533 × DB 534 F
4
IPS 49 and DH 98-27 exhibited the
highest yield of 2884.26 kg/ha. Similarity coefficient
(88%) value between lines and testers showed
between the line DB 533 × DB 534 F
4
IPS 52 and the
tester ZCH8, the hybrid between these recorded an
yield of 2040.757 kg/ha. Lowest similarity coefficient
value was noticed between the line DB 533 × DB 534
F
4
IPS 16 and tester DH 98-27 which revealed that
they are far distinct from each other. This combination
exhibited 2384.62 kg/ha yield.
1.3 Correlation between genetic distance and
hybrid performance and heterosis
Genetic distance (GD) based on SSR markers were
computed in Table 3. Genetic distance (GD) ranged
from 0.041 to 0.429, with an average of 0.183. The
result implied that each cluster dendrogram
substantially reflected its own genetic relationship
among parents. Overall, a low significant correlation
of GD with hybrid performance and heterosis was
detected in Table 4 and Figure 3. Highly significant
positive correlation were found between genetic
distance (GD) and ginning outturn for F
1
performance
(0.277) and heterosis over MRC 6918 (0.279) and
DCH 32 (0.279), while significant positive correlation
were found between genetic distance (GD) and
ginning outturn for mid parent heterosis (0.237).
Highly significant positive correlation were found
between genetic distance (GD) and seed cotton yield
for F
1
performance (0.359) and heterosis over
Bt
check MRC 6918 (0.336) and over non
Bt
check DCH
32 (0.362), while significant positive correlation were
found between genetic distance (GD) and seed cotton
yield for mid parent heterosis (0.226). Significant
positive correlation were found between genetic
distance (GD) and lint index for mid parent heterosis
(0.227), F
1
performance (0.251) and heterosis over
MRC 6918 (0.250) and DCH 32 (0.250), while
significant positive correlation were found only
between genetic distance (GD) and fiber micronaire
value for F
1
performance (0.241).
Figure 3 Relationship between genetic distance (GD) and
interspecific F
1
performance, mid parent heterosis and heterosis
over MRC 6918 and DCH 32 for seed cotton yield (kg/ha)
G. hirsutum
and
G. barbadense
are allotetraploid
(2n=4x=52) cottons, which together represent the
most extensively cultivated species worldwide. While
G. hirsutumis
the most widely-cultivated species
well-known for its higher yield ad wider
environmental adaptation. It was recognized that the
two species cross easily and produce vigorous F
1
hybrids (Loden and Richmind, 1915). Useful heterosis
in interspecific F
1
hybrids which combined
productivity and quality has been reported by many
researcher (Davis and Palomo 1980, Roupakias et al.
1998, Galanopoulou-Sendouca and Roupakias, 1999;
Zhang and Wang, 2005).
Genomics and Applied Biology