Abstract:
H
igh Molecular Weight Glutenin Subunits (HMW
-
GS) composition
s
of 122 genotypes
from bread wh
eat
crossing block
were
investigated in terms of some quality traits such as
g
rain Protein Content (PC),
Sodium Dodecyl Sulphate
(SDS), t
he Particle Size Index
(PSI), and Thousand Kernel Weight
(TKW), by using SDS
-
PAGE.
In total
, 12 different
HMW
-
GS combin
ations were determined.
Considerable diversity in terms of three
Glu
-
A1
,
Glu
-
B1
and
Glu
-
D1
loci were identified. In
Glu
-
A1
locus, 1/2*, 1 and 2* alleles were
found with the frequency of 2.5, 12.3 and 85.5%
, respectively
. Whereas, in
Glu
-
B1
, out of
7 report
ed alleles, 7+8 (20.5%) and 17+18 (17.2%) were detected.
Existence of 2 alleles at
the locus
Glu
-
D1
was revealed; in fact, 54.1% of them demonstrated the subunits 5+10
correlated with good bread making properties. The
Glu
-
1
score of genotypes ranged from
6
to 10.
Among
the genotypes, only 23 (18.9%) had 10
Glu
-
1
quality score value. In the
evaluation using the Genotype
-
Traits (GT)
Biplot
graph, PC and PSI were involved in
section I while SDS sedimentation value and
Glu
-
1
score were involved in section II. O
n
the other hand, section III included the only TKW
which was negatively associated with
other traits. The desired genotypes can be used for the crossing programs to improve
technological quality of bread wheat.
Keywords
: Biplot, HMW
-
GS, Landraces,
Quality
.
