Drought stress is one of the major limitations to crop productivity. To develop crop plants with enhanced tolerance of drought stress, a basic understanding of physiology is essential. The objective of this study was to investigate the possible physiological basis of high yield of the wheat RILs. We thus compared photosynthetic capacity of flag leaves and tolerance to drought stress between the wheat RILs and its parents. Agronomic and physiological traits were measured on young flag leaves of full grown plants of both stressed and non stressed treatments at an early (EGF) and late (LGF) grain-filling stage. The responses of An, gs, and Ci in this study make clear that drought stress significantly decreases photosynthesis rate. Compared with Ci, An and gs was found to be more sensitive to the drought stress.
|Number of pages
|Journal of Food, Agriculture and Environment
|Published - 2010
- drought stress
- flag leaf
- stomatal conductance
- intercellular CO₂ concentration