Agriculture Reference
In-Depth Information
σ
p
is the estimated phenotypic standard devi-
ation of the character concerned. Thus, at
5% (say) selection intensity,
σ
p
. Thus, the broad sense heritability for leaf
yield is
2
g
σ
2
903
:
95
987; similarly
the broad sense heritability values for other
characters also worked out.
h
¼
p
¼
09
¼
0
:
the genetic
σ
916
:
advance for
the character
leaf yield per
2
plant
is
GA
¼ k:h
:σ
p
¼
2
:
06
0
:
987
(d)
Co-heritability
Co-heritability between two characters 1 and
2 is given as
σ
g
12
30
:
267
¼
61
:
54;
similarly
the
genetic
advance
orgain
values
for
the
other
σ
p
12
, where
σ
g
12
and
σ
p
12
are the
estimates of genotypic and phenotypic
covariances between the characters 1 and 2,
respectively. Thus, the co-heritability
between the leaf yield and the total shoot
length is
σ
g
12
characters also worked out.
Sometimes it is customary to present the
genetic gain or advance values as percentage
over mean. As such the genetic advance of
leaf yield per plant at percentage over mean
is
61
:
54
:
All the above genetic parameters, namely,
phenotypic and genotypic coefficients of var-
iation, broad sense heritability, and genetic
advance, for the characters are presented in
the following table.
Table of genetic parameters
184
:
71
100
¼
33
:
32
2108
:
02
996; similarly the
co-heritability values among the other
characters also worked out.
σ
p
12
¼
78
¼
0
:
2115
:
(e)
Genetic Advance/Gain
Genetic gain or advance is GA
¼ k:h
2
:σ
p
,
where
k
is the standardized selection differ-
2
is the broad sense heritability, and
ential,
h
Fresh weight
of leaf
Leaf weight/m
2
Genetic parameter
Yield/plant
Shoot length
Leaf area
Phenotypic coefficient
of variation
16.39
29.86
40.48
30.36
40.50
Genotypic coefficient
of variation
16.28
29.74
40.44
30.33
40.49
Broad sense heritability
0.99
0.99
1.00
1.00
1.00
G. A./gain
61.54
278.66
121.69
51.89
142.39
G.A. as percent over mean
33.32
61.00
83.22
62.40
83.38
Fresh weight
of leaf
Co-heritability
Yield/plant
Shoot length
Leaf area
Shoot length
0.999
Fresh weight of leaf
0.999
0.991
Leaf area
0.998
1.00
0.999
Leaf weight/m
2
0.998
0.991
0.999
0.998
The above analysis can be made using the
SPAR1 software, and the output is as follows:
ANALYSIS OF VAR COV
Source D.F. MEAN SUM OF SQ F-VALUE
CHARACTERS 1 1
REP 2. 0.63750000E+01 0.52527020E+00
TRET 9. 0.27239976E+04 0.22444470E+03
EROR 18. 0.12136610E+02 0.10000000E+01
CHAR 1 TREATMENT MEANS
158.67 192.43 195.62 211.23 202.29 205.42 217.63 170.28 117.58 176.00
S.E. OF DIFF BET TWO MEANS
¼
0.28444810E+01
GRAND MEAN
¼
184.7133
COEFF. OF VARIATION
¼
1.8860
