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International Journal of Horticulture 2012, Vol.2, No.5, 21
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22
populations (800 plants in each F
2
populations) were
grown in RBD with two replications and
observations were recorded on 5 randomly selected
plants in each F
2
population for twelve characters.
The plot size was four rows each of 5 m length with
spacing of 60 cm×30 cm.
The correlation coefficient was computed according
to the method suggested by Weber and Moorthy
(1952) as given below: r = Cov xy/(
Vx Vy), Cov xy
=Covariance between the characters x and y; Vx=
Variance of the character x; Vy=Variance of the
character y.
Results and Discussions
Analysis of variance for the characters studied,
indicated highly significant for all the three types of
populations suggested the existence of sufficient
amount of genetic variability in the parents selected
for study (Table 1).
All the fruit and fruit related characters showed
significant positive association with fruit yield per
plant and also among themselves except the
characters days to 50 % flowering, and fruit diameter,
internodal length in all the three populations studied
(Table 2). In present study, high association was
observed for all the traits in the biparental (BIP) and
low associations in single cross (SC) and double
cross (DC) F
2
populations. Among the BIP’s
populations, number of fruits per plant (0.929**), 100
seed weight (0.871**), average fruit weight (0.859**),
number of nodes per plant (0.611**), number of
branches per plant (0.916**) and plant height (0.912**)
exhibited positive significant association with fruit
yield per plant. These findings are in conformity with
the results of (Singh, 2006) in okra.
A comparison of direction and magnitude of
association among characters between all the F
2
populations (Table 3) indicated that, several new
associations in terms of direction and magnitude of
association was observed. For example association
of plant height with average fruit weight (0.756**);
and number of fruits per plant with average fruit
weight (0.625**), which was non-significant in case
of SC and DC F
2
populations but changed to
significant and positive in BIP populations under
study (Figure 1), indicates the breakage of
undesirable linkage between these traits. Such
changes in magnitude and direction may occur due
to gene reshuffling and breakage of linkage due to
intermating in the early segregating populations.
Similar type of shift in association was seen between
plant height and seed yield; number of branches and
seed yield; number of capitula per plant and seed
yield in safflower (Parameshwarappa, 2009).
Table 1 Analysis of variance for twelve quantitative characters in BIP F
2
population of okra
Characters
BIP F
2
SC F
2
DC F
2
Days to 50% flowering
2.75**
3.21**
2.99**
Plant height (cm)
47.05**
51.09**
52.22**
No of nodes per plant
13.91*
14.13*
15.92**
Internodal length (cm)
1.45**
2.09**
2.11**
Stem diameter (cm)
1.85*
1.79**
1.63*
Number of branches per plant
3.43**
2.91**
2.61**
Number of fruits per plant
7.99**
6.57**
6.79**
Fruit length (cm)
11.2**
10.02**
10.11**
Fruit diameter (cm)
7.05**
8.26**
7.98**
Average fruit weight (g)
3.99**
3.71**
3.25**
100 seed weight (g)
0.92**
0.88**
0.89**
Fruit yield per plant (g)
52.06**
47.99**
48.99**
Note: *: Significant @ 5%; **: Significant @ 1%