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YIELD STABILITY IN
BREAD WHEAT GENOTYPES
MUHAMMAD AFZAL ARAIN1,
MAHBOOB ALI SIAL1, M. ARIF RAJPUT1 AND AMEER A.
MIRBAHAR2
Abstract:
Stability for grain
yield performance and genotype x environment (GxE) interaction was
studied in twelve (nine advance genotypes and 3 checks) wheat genotypes
evaluated at various locations having different agro-climatic conditions
in Sindh province of Pakistan over two years. The combined and
individual analysis of variance for locations and years was conducted.
Pooled analysis of variance revealed highly significant (p<0.01)
difference for genotypes, environments and genotype x environment (GxE)
interaction. A joint regression analysis was applied to grain yield
data to estimate the stability parameters viz., regression coefficient
(b), s.e. (b) and deviation from regression coefficients (S2d)
for each genotype. Genotype MSH-14 produced the highest mean yield (5090
kg/ha) in all environments averaged for two years, and had regression
coefficient (b) close to unity (0.86) and S2d close to zero
(0.7923). This indicated wide adaptation and stability of performance of
MSH-14 in all environments. Other high yielding genotypes MSH-03 and
MSH-05 ranked 2nd and 3rd showing regression
coefficient (b=0.78 and 0.69 respectively) and deviation from regression
(S2d= 1.076 and 1.29 respectively) indicating specific
adaptability of these genotypes to harsh (un favorable) environments.
These findings suggested that both the genotypes could be used as stress
tolerant genotypes under stressed environments (such as drought, heat
and salinity stress).
1Nuclear
Institute of Agriculture (NIA) Tando Jam 70060, Sindh, Pakistan
2Biotechnology
Wing, HEJ, Research Institute of Chemistry, University of Karachi,
Pakistan
niatjam@yahoo.com;
mahboobali.sial@gmail.com
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