Plant Gene and Trait, 2015, Vol.6, No.7, 1-11
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Table 4 Selection function, expected genetic gain and relative efficiency (RE%) of different selection indices of brinjal
Selection Function
Expected Genetic Gain
Relative Efficiency Over Direct
Selection
I
1
=b1x1
1.31
100%
I
2
=b2x2
1.22
93.20%
I
3
=b3x3
2.19
166.79%
I
4
=b4x4
1.28
97.55%
I
5
=b5x5
0.48
36.38%
I
12
=b1x1+b2x2
2.2
167.42%
I
13
=b1x1+b3x3
3.04
231.89%
I
14
=b1x1+b4x4
2.15
164.01%
I
15
=b1x1 +b5x5
1.59
120.94%
I
23
=b2x2+b3x3
2.13
162.25%
I
24
=b2x2+b4x4
1.89
144.03%
I
25
=b2x2+b5x5
1.37
104.15%
I
34
=b3x3+b4x4
2.39
182.47%
I
35
=b3x3+b5x5
2.36
180.00%
I
45
=b4x4+b5x5
1.47
112.39%
I
123
=b1x1+b2x2+b3x3
3.26
248.24%
I
124
=b1x1+b2x2+b4x4
2.86
217.88%
I
125
=b1x1+b2x2+b5x5
2.4
183.01%
I
134
=b1x1+b3x3+b4x4
3.39
258.14%
I
135
=b1x1+b3x3+ b5x5
3.26
248.31%
I
145
=b1x1+ b4x4+b5x5
2.4
182.53%
I
234
=b1x1+ b4x4+b5x5
2.43
185.32%
I
235
=b2x2+b3x3+ b5x5
2.34
178.16%
I
245
=b2x2+ b4x4+b5x5
2.06
157.15%
I
345
=b3x3+b4x4+b5x5
2.61
199.17%
I
1234
=b1x1+b2x2+b3x3+b4x4
3.64
277.54%
I
1235
=b1x1+b2x2+b3x3+ b5x5
3.48
265.22%
I
1245
=b1x1+b2x2 +b4x4+b5x5
3.07
233.94%
I
1345
=b1x1 +b3x3+b4x4+b5x5
3.63
276.24%
I
2345
=b2x2+b3x3+b4x4+b5x5
2.67
203.85%
I
12345
=b1x1+b2x2+b3x3+b4x4+b5x5
3.88
295.87%
I
1
= yield/plant (g), I
2
= fresh weight/fruit (g), I
3
= no. of fruits in inflorescence/plant, I
4
= no. of fruits in solitary/plant, I
5
= no. of
secondary branches/plant
So the selection index I
134
, can be identified as
profitable effectiveness over direct selection for
improvement of the brinjal.
Selection would be more effective if we consider four
characters where index I
1234
showed maximum
efficiencies (277.54%) over straight selection with
expected genetic gain (3.64). Character fresh
weight/fruit (g), no. of fruits in inflorescence/plant and
no. of fruits in solitary/plant also showed strong
positive correlation with yield at both genotypic and
phenotypic level. So selection index I
1234
would be
more effective for improvement of these genotypes as
similar reported by Sameer Kumar et al. (2012) in rabi
Sorghum. In the presented functions, selection index
I
12345
showed highest relative efficiency over direct
selection was 295.87% with genetic gain 3.88 when
all the characters were included to construct the
selection index. But selection based on five characters
would be incompetent because of inclusion low
efficient character like no of secondary branches/plant
which ultimately reduces relative efficiency of
combination character for yield.
Selection index I
134
as a desirable and economically
favorable index was considered to evaluate selection
score for 21 brinjal genotypes (Table 5). In the present
study highest selection score was observed for Debjhuri
