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Tolerance of 42 Bread Wheat Genotypes to Drought Stress after Anthesis |
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Reza Shahryari,
Elshad Gurbanov,
Aladdin Gadimov and Davoud Hassanpanah |
Abstract:
The present research characterized yield and yield components of
42 wheat genotypes after terminal drought stress. The experiment was in
twice replicated simple rectangular lattice design, conducted at irrigated
and terminal stress conditions during 2006-2007. These study genotypes
had significant differences for grain yield at level of 1%. Genotypes
4057, Viking/5/Gds/4.., Sabalan and 5041 respectively with 6.313, 6.159,
5.793 and 5.774 t ha-1 had the highest yield and Gascogen has
the lowest yield with 2.561 t ha-1. Mean of total grain yield
for under study genotypes was 5.628 t ha-1 in non-stress and
3.305 t ha-1 in drought stress conditions. Drought stress decreased
amount of grain yield 2.323 t ha-1 that was noticeable. Interaction
of Genotypexenvironmental conditions was significant at probability level
of 1% for grain yield. Yield of all genotypes in drought condition was
lower than non-stress condition. Genotypes Viking/5/Gds/4/Anza/3/Pi..,
Sabalan, 4061, 4057 and 4041 had more yield in non-stress condition and
MV17/Zrn, Sabalan, Saysonz and 4032 in stress condition. Stress intensity
pay attention to total grain yield was 42%. Genotypes Viking/5/Gds/4/..
and Sabalan had high grain yield and was better than other genotypes and
controls (Toos and Crosse Shahi), according to GMP, STI and MSTI. And
had the most amount of stress tolerance index as compared with other genotypes
confirms this subject. Correlation of yield with other traits was not
significant in non-stress condition. In drought condition, correlation
of grain yield with 1000 grain weight and total number of tillers per
plant was positively significant. ANOVA showed significant differences
between osmotic pressures for coleoptile length, between genotypes for
mean and maximum coleoptile length and between interactions of genotypesxosmotic
pressures for mean and maximum coleoptile length. Mean comparisons showed
the highest total, mean and maximum coleoptile length in -7 bar PEG+1
ml L-1 potassium humate treatments. Genotypes Sardari and Sabalan
had the highest amounts of total, mean and maximum coleoptile length.
With due attention to interaction genotypexosmotic pressures, genotypes
Sardari, Sabalan and 4057 in -7 bar PEG+1 ml L-1 potassium
humate had the most amounts of noted characters than others. In conditions
of this experiment, potassium humate caused increase in tolerance rate
of genotypes against drought stress.
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How to cite this article:
Reza Shahryari, Elshad Gurbanov, Aladdin Gadimov and Davoud Hassanpanah, 2008. Tolerance of 42 Bread Wheat Genotypes to Drought Stress after Anthesis. Pakistan Journal of Biological Sciences, 11: 1330-1335.
DOI: 10.3923/pjbs.2008.1330.1335
URL: https://scialert.net/abstract/?doi=pjbs.2008.1330.1335
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