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Asian Journal of Crop Science

Year: 2011 | Volume: 3 | Issue: 4 | Page No.: 158-168
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Authors

M.A. Ali

Keywords

Research Article

Pedigree Selection for Grain Yield in Spring Wheat (Triticum aestivum L.) under Drought Stress Conditions

M.A. Ali
The objective of this study was to estimate the response to direct selection for grain yield/plant under normal and water stress conditions and study the correlated response of other studied traits. Two cycles of pedigree selection for grain yield/plant were practiced on a segregating population of wheat (Giza 168xSids 1) in the F3-F5 generations. Selection was practiced separately and over environments, at normal irrigation environment and drought stress irrigation environment. After the second cycle, the F5-selected families were evaluated at the two environments. Pedigree selection for the two cycles at each environment showed 25.00 and 25.54% increase in grain yield/plant over the bulk samples for normal and drought stress selections, respectively, compared to 22.60% for selections over environments. The antagonistic selection was more efficient than synergistic selection in changing the mean. Selection for grain yield/plant was accompanied by late in heading date of 1.76, 4.07 and 0.13%, increase in plant height of 13.09, 9.79 and 7.38% and with decrease in 1000-grain weight of -2.01, -2.02 and -4.31% over the bulk sample when selection was practiced under normal, drought stress and over environments, respectively. Drought Susceptibility Index (DSI) was estimated for grain yield/plant. Four selected families i.e., No. 9 under normal environment, no. 71 under drought stress environment and no. 10 and 70 under over environments displayed DSI values less than one and the highest grain yield/plant. These families could be considered the best selected families resulted from selection for grain yield/plant. Pedigree selection for improving grain yield/plant was effective in isolating high yielding and drought tolerant genotypes.
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