Varietal response of wheat to water stress at different growth stages. III. Effect on grain yield, straw yield, harvest index and protein content in grain
1996
Jamal, M. (Agricultural Research Station, Serai Naurang (Pakistan)) | Nazir, M.S. | Shah, S.H. | Ahmed, N. (University of Agriculture, Faisalabad (Pakistan). Department of Agriculture)
Three varieties of wheat (Triticum aestivum L. subsp. aestivum, Pak 81, Punjab 85 and Kohinoor) were subjected to low water stress (-10 bars on-leaf-water potential basis) at tillering, jointing, boot and anthesis growth stages. Water potential of the central leaves was determined on alternate days using a Pressure Bomb until the desired level of -10 bars was achieved. At this stage water stress was terminated by applying 7.5 hectare centimeter water by calibrated buckets. Stressed plots were protected from rain by polyethylene sheets placed over iron frames when needed. Grain yield of wheat was significantly reduced by water stress at all stages of growth. However, maximum adverse effect was noted when stress occurred at anthesis. Among varieties, Pak 81 was highest yielding, followed by Punjab 85. Interaction between varieties and water-stress treatments was also significant. Kohinoor was the most sensitive variety to water stress, particularly stress at anthesis. Straw yield was reduced by water stress only when it occurred at jointing. Harvest index was significantly reduced by all stress treatments. Grain protein content was drastically increased by water stress, especially stress at anthesis. Pak 81 and Punjab 85 had significantly more protein content than Kohinoor. However, maximum grain protein content was recorded in Punjab 85 and Kohinoor when stressed at anthesis, but the minimum was recorded in the control
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