Abstract:
Tests were done to determine high
-
yielding and stable durum wheat genotypes. An
expe
riment was set up as a RCBD (Randomized Complete Block Design) with three
replications on 17 advanced durum wheat genotypes under rainfed and supplementary
irrigation conditions in the cropping seasons of 2011
-
13. Combined analysis of variance
indicated th
at environment main effect accounted for 70.09% of total yield variation; and
effects of genotype and Genotype
×
Environment Interaction (GEI) accounted for 2.95 and
10.71%, respectively. Results indicated remarkable difference in genotypes response
across e
nvironments.
G×E
interaction was analyzed following Additive Main effects and
Multiplicative Interaction (AMMI) model. The first two interaction Principal Component
Axes (IPCA1 and IPCA2) explained 53.75 and 36.99% of total interaction effects,
respectivel
y. Based on the AMMI model, AMMI Stability Value (ASV) and Genotype
Selection Index (GSI), genotypes G11, G8, and G14 were selected for all environments.
According to the AMMI2 biplot, the G15, G16 and G17 exhibited specific adaptation with
rainfed (E1) an
d irrigation (E2) environments. G3 and G4 displayed specific adaptation
with rainfed (E3) environment and G10, G9, G1, and G12 indicated specific adaptability
with irrigation (E4) environment. The E3 had high discrimination ability, so, this
environment wa
s considered sufficient for making genotypes recommendation. Results of
this investigation illustrate that the AMMI stability parameters are suitable for
characterizing stable genotypes and that the
GSI
parameter can detect genotypes with
high grain yield
and good stability for plant breeding research in durum wheat.
Keywords:
Adaptation,
AMMI analysis,
ASV
,
GSI
,
GEI
.
