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Abstract
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Article Information:
Effect of Water Stress in Bread Wheat Hexaploids
N. Khan and F.N. Naqvi
Corresponding Author: Nadia Khan
Submitted: 2011 June, 20
Accepted: 2011 August, 08
Published: 2011 September, 10 |
Abstract:
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The current objective was to identify tolerant and susceptible genotypes of wheat under different
irrigation levels and also to find out the most crucial stage of plant with respect to yield traits. The experimental
material consisted of eight bread wheat hexaploids namely Kohistan-97, Rawal-87, Chakwal-86, Inqilab-91,
Watan, Uqaab-2000 and Sarsabz. Stress was imposed by withholding irrigation at three different growth stages
of plant i.e., vegetative, anthesis and vegetative+anthesis. Agronomic data were recorded for each wheat
genotype at different growth stages that included days to flowering, number of tillers, plant height, number of
spikes, number of spikelets per spike, number of grains, grain yield and 1000-grain weight. Four drought
resistance indices include Stress Susceptibility Index (SSI), Yield Stability Index (YSI), Mean Productivity
(MP) and Tolerance Index (TOL) was applied on the basis of grain yield in non-irrigated conditions. Among
eight hexaploid wheat genotypes Rawal-87, Chakwal-86 and Pak-81 showed less affect on all traits under
different water stress conditions so can be considered as tolerant genotypes. On the other hand Kohistan-97,
Inqilab-91, Watan and Uqaab-2000 were greatly affected for yield and yield components under different
irrigation levels. It may be concluded these genotypes were susceptible to water stress conditions. Tolerant
wheat genotypes can be considered promising with respect to yield and yield contributing traits. Based on
different stress indices, genotypes Rawal-87, Chakwal-86 and Pak-81 had the best rank under water stress
conditions. These traits therefore deserve better attention in future breeding programs for evolving better wheat
for stress environments.
Key words: Agronomic traits, hexaploid wheat, resistance indices, tolerant and susceptible genotypes, water stress, ,
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Cite this Reference:
N. Khan and F.N. Naqvi, . Effect of Water Stress in Bread Wheat Hexaploids. Current Research Journal of Biological Sciences, (5): 487-498.
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ISSN (Online): 2041-0778
ISSN (Print): 2041-076X |
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