Citrullus lanatus (Thunb.) Matsum. & Nakai - Cucurbit Breeding ...

[ ]
! 2 ( P)
= ! 2 ( F2 ) ! 2 ( E)
= ! 2 ( Pa ) + ! 2 ( Pb ) + 2 " ! 2 ( F1 )
! 2 ( G)
= ! 2 ( PH ) " ! 2 ( E)
! 2 A
( ) = 2 " ! 2 ( F2 )
4
[ ] # ! 2 ( BC P 1 a ) + ! 2 [ ( BC P 1 a ) ]
Negative estimates for genetic variances are possible with the experimental design adopted. Negative
estimates should be considered equal to zero (Robinson et al., 1955), but should be reported "in order to
contribute to the accumulation of knowledge, which may, in the future, be properly interpreted" (Dudley and
Moll, 1969). We considered negative estimates equal to zero for the calculation of the mean estimates over
families or locations. When a negative estimate was derived from another negative value (narrow-sense
heritability and gain from selection, calculated from additive variance), it was considered close to zero and
omitted.
The number of effective factors was estimated using the following methods (Lande, 1981; Mather and
Jinks, 1982; Wright, 1968):
Lande's method I:
Lande's method II:
Lande's method III:
Mather's method:
Wright's method:
8 " # 2 $
%
&
( ) !
F 2
[ ] 2
µ ( P ) ! µ ( P )
b
a
2
# ( P ) + # a
2 ( P ) + 2 " # b
2 [ ( F ) 1 ] '
(
4
)
[ µ ( P ) ! µ ( P )
b
a ] 2
( F ) ( BC P ) + # 2
1 a
2
{ ( BC P ) 1 a }
[ ] ! # 2 [ ]
8 " 2 " # 2
[ ( ) ] 2
µ ( P ) ! µ P b
a
8 " # 2 ( BC P ) + # 1 a
2 ( BC P ) ! # 1 a
2
2
# ( P ) + # a
{ [ ( F ) 1 ] } ! 2 [ ( P ) b ]
2
[ ( ) ] 2
µ ( P ) ! µ P b
a
2
2 " # 2 [ ( F ) 2 ] ! # 2 ( BC P ) + # 1 a
2
[ ( ) ] 2
[ ( BC P ) 1 a ]
µ ( P ) ! µ P " 1.5 ! 2 " b
a
µ F ( ) ! µ ( P )
1
a
µ ( P ) ! µ ( P ) b
a
" 1 ! µ F / )
# ( ) ! µ P 1
a
0 +
$
%
1 *
µ ( P ) ! µ P b
a
8 " 5 2
2
5 ( P ) + 5 a ( F ) ! 2
2 ( P ) + 2 " 5 b
2
/
[ ( F ) 1 ] 2
0
4
1
3
4
( )
( )
& , 2
'
( . 3
-4
107