Effect of Water Stress in Bread Wheat Hexaploids

N. Khan ； F.N. Naqvi

《Current Research Journal of Biological Sciences》 3卷5期 (2011/09) Pp. 487-498

並列摘要

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.

並列關鍵字

Agronomic traits ； hexaploid wheat ； resistance indices ； tolerant and susceptible genotypes ； water stress