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DROUGHT TOLERANCE
INDICES AND THEIR CORRELATION WITH YIELD IN EXOTIC WHEAT
GENOTYPES
JAVED ANWAR, GHULAM
MAHBOOB SUBHANI*, MAKHDOOM HUSSAIN, JAVED AHMAD, MUJAHID HUSSAIN AND
MUHAMMAD MUNIR
Abstract:
Performance of nineteen exotic genotypes along with local check variety
was studied during 2009-10 at Wheat Research Institute, AARI,
Faisalabad, Pakistan. The experiment was conducted under two field
conditions i.e., stress and irrigated conditions. In case of water
stress experiment, only soaking irrigation was applied for seed bed
preparation and no further irrigation was applied up to maturity. While,
four irrigations were applied at critical growth stages to the second
experiment (irrigated). At maturity, grain yield was recorded in both
experiments (stress Ys and irrigated Yp). From
grain yield data, some drought tolerance/resistance indices such as
tolerance index (TOL), mean productivity (MP), harmonic mean (HM),
stress susceptibility index (SSI), geometric mean productivity (GMP),
stress tolerance index (STI), yield index (YI), yield stability index
(YSI) and modified stress tolerance index (k1STI & k2STI)
were calculated. Genotypic correlation, genetic components and
heritability were also calculated for grain yield and all indices.
Significant differences among genotypes were observed for Yp,
Ys and all other drought tolerance indices. Moderate to high
heritability and genetic advance were observed for Yp, Ys
and all drought tolerance indices.
Grain
yield under irrigated environment (Yp) was positively and
significantly correlated with MP, HM, GMP, STI and k1STI.
Similarly, positive and significant association has also been observed
between grain yield under stress condition (Ys) and MP, HM,
GMP, STI, YI and k2STI so they were the better predictor of
potential yield Yp and Ys than TOL, SSI and YSI.
According to Fernandez model; genotypes No. 2, 4, 6, 7, 9 and 13 have
uniform superiority under both conditions (stress and irrigated).
Genotypes No. 1, 11, 15, 16, 17, 18 and 19 were recommended for
irrigated conditions. Genotypes No. 3 and 5 were identified suitable for
stress conditions. While genotypes No. 8, 10, 12, 14 and 20 performed
poorly under either environments (stress and irrigated).
Wheat Research
Institute, Ayub Agricultural Research Institute (AARI),Faisalabad–38950,
Pakistan.
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