Molecular Plant Breeding 2016, Vol.7, No.19, 1
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Table 3 Construction of selection indices in 30 chilli genotypes
Selection index
Expected genetic gain
Relative efficiency over direct selection (%)
I
5
=0.8890x5
1.14
100
I
1
=0.7837x1
0.55
48.51
I
2
=0.8853x2
0.58
50.91
I
3
=0.9548x3
1.31
114.69
I
4
=0.8890x4
0.84
73.52
I
12
=0.7078x1+0.8014x2
0.68
59.84
I
13
=0.7845x1+0.9233x3
1.29
113.17
I
14
=0.5136x1+0.8857x4
1.11
97.29
I
15
=2.1870x1+0.8879x5
1.3
114.16
I
23
=0.8963x2+0.9898x3
1.55
135.96
I
24
=0.7491x2+0.8895x4
1.03
90.70
I
25
=4.4896x2+0.8760x5
1.44
125.81
I
34
=0.3128x3+0.8855x4
1.42
124.72
I
35
=2.3450x3+0.8812x5
2.1
183.91
I
45
=0.8629x4+0.8925x5
1.83
160.07
I
123
=0.7227x1+0.8214x2+0.9619x3
1.48
129.52
I
124
=1.4420x1+0.8305x2+0.8861x4
1.19
104.52
I
125
=3.3320x1+5.0712x2+0.8728x5
1.51
132.28
I
134
=1.4099x1+0.4141x3+0.8830x4
1.48
130.06
I
135
=2.7310x1+2.9381x3+0.8772x5
2.11
184.81
I
145
=3.1893x1+0.8372x4+0.8971x5
1.99
174.26
I
234
= 0.8947x2+0.3483x3+0.8855x4
1.66
145.32
I
235
= 4.4305x2+1.9659x3+0.8712x5
2.35
205.89
I
245
=4.4790x2+0.9049x4+0.8707x5
2.03
178.00
I
345
=1.5114x3+0.8813x4+0.8852x5
2.46
215.51
I
1234
=1.374x1+0.9434x2+0.4302x3+0.8831x4
1.66
145.31
I
1235
=3.8557x1+5.0746x2+2.8598x3+0.8625x5
2.32
203.37
I
1245
= 4.1372x1+5.1203x2+0.8762x4+0.8731x5
2.14
187.24
I
1345
=3.3204x1+2.2290x3+0.8774x4+0.8810x5
2.51
220.19
I
2345
=4.6650x2+2.6264x3+0.9619x4+0.8482x5
2.68
235.04
I
12345
=4.5383x1+5.5173x2+3.9688x3+0.9749x4+ 0.8331x5
2.7
236.47
Note: x1=Primary branches/plant, x2= Fruit length (cm), x3= Fruit weight (gm), x4= Fruits/plant, x5= Yield/plant (gm)
In the present study, selection index based on five characters gave maximum genetic gain and high efficiency over
straight selection but it is tedious and time consuming for a plant breeder to choose all characters for improving
yield. Keeping eyes on saving time and labour in a selection programme, it would be desirable to choose a few
characters. Hence, an efficient plant breeder feel like including as minimum as possible the characters at a time to
achieve as maximum as possible the genetic gain. In this present investigation, selection index (I
345
) based on
three characters (fruit weight+ fruits/plant+ yield/plant) showing genetic gain (2.46%) and relative efficiency
(215.51%) is more desirable and practically possible to use than those based on four or more characters.
