Page 6 - Molecular Plant Breeding

Molecular Plant Breeding 2013, Vol.5, No.4, 18-23
http://mpb.biopublisher.ca
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effects, in positive direction the parent IIHR- 2866(P7)
had the highest significant value (3.40) fallowed by
IIHR- 2864P5) (1.94) as suggested by Prabhushankar
(1990) and Patil (2003). In this respect they opined
that both additive and non-additive genetic variances
were important in the inheritances of total yield but
additive genetic variance was more important than
non- additive genetic variance.
Highest significant and positive GCA effect for
number of locules per fruit was found in Parent
IIHR-2865(P6) (0.43) (Table 2). The parents IIHR-2860(P3)
and IIHR-2863(P4) showed same negative insignificant
value (- 0.12) so parent IIHR-2865(P 6) was the best
general combiner for number of locules per fruit.
In case of fruit firmness parent IIHR- 2864(P5)
showed highest and positive significant GCA effect
(0.89**) and two parents showed the same negative
significant value (- 0.12). For pericarp thickness
parent IIHR-2864(P 5) had the highest positive
significant value (0.91**) fallowed by parent
IIHR- 2860(P3) (0.08) the other parents had significant
or insignificant negative GCA values for the trait,
hence parent IIHR-2864(P5) was the best general
combiner for pericarp thickness.
Specific Combining ability
The SCA effects signify the role of non-additive gene
action in the expression of the characters. It indicates
the highly specific combining ability leading to
highest performance of some specific cross combinations.
That is why it is related to a particular cross. High
SCA effects may arise not only in crosses involving
high combiners but also in those involving low
combiners. The SCA effects of 21 F1 crosses for the
fortheen different characters studied are presented in
Table 2.
Among 21 hybrids, 16 hybrids displayed significant
SCA effects for plant height among that 11 showed the
positive SCA effect and remaining 5 showed the
negative effect. In case of number primary of branches
per plant, 11 hybrids expressed significant SCA
effects in both direction in which IIHR-2754×
IIHR- 2860(0.18**) had significant highest positive
SCA effect, for number secondary of branches per
plant, 11 hybrids expressed significant SCA effects in
both direction which ranged between -2.91**
(IIHR-2864×IIHR-2865) to 0.5* (IIHR-2860×IIHR-2863).
In case of number of inflorescence per plant, out of 21
hybrids 15 hybrids showed the significant SCA effect
in both direction, the value ranged between the
-6.05(IIHR-2858×IIHR-2863) to 20.18**(IIHR-2858×
IIHR-2860). In case of number of fruits per kg, the
hybrid IIHR -2864×IIHR- 2865 (13.69**) registered
highest SCA effects followed by IIHR -2754×
IIHR-2858(5.24**) hence (IIHR-2858×IIHR-2860) was
the best general combiner for number of fruits per kg.
For fruit yield per plant, out of 21 hybrids 12 hybrids
showed the positive significant SCA effects which
ranged between 1.19** (IIHR -2754×IIHR- 2860) to
0.11*(IIHR -2858×IIHR- 2866) therefore the hybrid
IIHR-2754×IIHR -2860 used for further breeding
work, which indicated that yield potential can be
tapped through heterosis by this specific combiner.
In case of number of locules per fruit, the hybrid
IIHR -2865×IIHR- 2866 (0.40) recorded maximum
SCA effect. In case of pericarp thickness, the hybrid
IIHR - 2858×IIHR-2865(0.84*) recorded maximum
SCA effects. These results were in accordance with
Patil (2003), Karganni (2003) and Mallangoud (2005)
(Table 2).
Material and Methods
The material for the present investigation comprised
of seven cherry tomato lines ( Solanum lycopersicum
var. cersiforme) namely IIHR-2754(P1), IIHR- 2858(P2),
IIHR- 2860(P 3), IIHR- 2863(P 4), IIHR- 2864(P 5),
IIHR - 2865(P6) and IIHR-2866(P7). Half diallel
analysis attempted by using seven parents of cherry
tomato during kharif 2011. All 21 F 1 along with their
(seven) parents were evaluated in randomized block
design with three replications at Division of Vegetable
Crops, Indian Institute of Horticultural Research
Bangalore during Rabi season 2012. The crop was
raised with row to row and plant to plant spacing
1×0.60 m respectively. The observations were
recorded on randomly selected five plants from
parents and F 1s. The observations were recorded on
plant height, number of primary branches, total