Abstract
Six genotype of Triticum aestivum L. in 1991 and one genotype of Triticum durum Desf. and three of T. aestivum L. in 1992 were studied under different water regimes: full irrigation (R1), mild water stress (R3) and severe water stress (R2) at Magneraud (France). Traits evaluated were grain yield and its components, stress susceptibility index (SSI) and normalized difference vegetation index (NDVI). The analysis of variance revealed significant differences between regimes and among the cultivars for all traits except between regimes for thousand grains weight in 1991. The regime × variety interaction was significant for grain yield, thousand grains weight and NDVI in 1992 and for grain yield in 1991. For all traits, durum wheat (T. durum Desf.) has higher reduction in the two water stress than the common wheat (T. aestivum L.). Correlations studies revealed that grain yield, grains number/m², thousand grains weight and NDVI were associated with each other except for correlations between thousand grains weight on one hand and grain yield (1992) and grains number/m² (1991) on the other hand. 51.55, 27.88, 4.12% (1991) and 75, 43 and 20.2% (1992) of grain yield, grains/m² and thousand grains weight variability, respectively were explained by means NDVI variability. The grain yield and grains number/m² could be predicted using a single regression with NDVI. Key words: Grain yield, grain yield components, NDVI, durum wheat and bread wheat.  
Highlights
Yield safety can only be improved if future breeding attempts will be based on the valuable new knowledge acquired on the processes determining plant development and its responses to stress (Barnabás et al, 2008)
Water regimes differences were significant for grain yield (p
The mean of all the traits under all water regimes showed that the traits under stressed conditions were always lower than under non-stressed conditions in the two tests
Summary
Yield safety can only be improved if future breeding attempts will be based on the valuable new knowledge acquired on the processes determining plant development and its responses to stress (Barnabás et al, 2008). Drought is a major factor limiting the productivity of wheat throughout the world in addition to other environmental stresses, high temperature, salt and cold stresses. The average yield of wheat is quite low in the areas which present water stress. The extent of modification depends upon the cultivar, growth stage, duration and intensity of stress (Araus et al, 2002). For Siddique et al (2000), the best option for crop production, yield improvement and yield stability under soil moisture deficient conditions is to develop drought tolerant crop varieties. For Siddique et al (2000), the best option for crop production, yield improvement and yield stability under soil moisture deficient conditions is to develop drought tolerant crop varieties. Rajaram et al (1996) suggested that simultaneous evaluation of germplasm should be carried out Sowing: R3
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