Abstract
Drought adaptation of wheat is one of the most significant and complex subjects in the rain-fed agricultural regions of West Asia. Interaction between root water-uptake and the remaining soil moisture is a key factor for drought adaptation. Under controlled conditions, root development was compared among four wheat genotypes under water deficit stress in relation to water-uptake. In addition, the effects of soil water deficit on the production of biomass and grain were examined using drought-adaptive varieties from different sources.Genotypic differences in root development were significant by the time of heading under well-irrigated conditions but were decreased under water-stressed conditions. After heading, water deficit stress also decreased grain yield through a reduction in grain number. Genotypic variations in transpiration efficiency and harvest index, two components of water-use efficiency, were significant and transpiration efficiency was negatively associated with root weight and water-uptake. ...
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