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Articles by A. Benmahammed
Total Records ( 4 ) for A. Benmahammed
  A. Benmahammed , M. Kribaa , H. Bouzerzour and A. Djekoun
  F2, F3 and F4-derived lines from 3 barley cross populations were used to investigate whether grain yield could be improved by selecting for above ground biomass and harvest index under semi-arid Mediterranean-type environment. Results indicated, in F2 and in F3, significant and positive correlation between grain yield and plant biomass as well as between grain yield and harvest index. The efficiency of indirect selection in F2 and F3, based on above ground biomass and on harvest index varied among crosses. Indirect selection was not more efficient no more consistent than direct selection for grain yield because of low similarity between early generations and low heritability of the selection criterion. Index selection including grain yield, above ground biomass and harvest index gave encouraging results which need to be confirmed.
  A. Mekhlouf , F. Dehbi , H. Bouzerzour , A. Hannchi , A. Benmahammed and A. Adjabi
  To increase grain yield in the North African high plateaus, selection of durum wheat (Triticum durum Desf.) was accompanied by an early heading for effective utilization of the limited soil moisture and to escape terminal drought and heat stresses. Early genotypes suffer however seriously from low temperature damage during cold season. Developing cultivars resistant to low temperature stress appears critical to avoid crop failure and to stabilize grain yield. The objectives of the present study were to evaluate the genotypic variability for resistance to low temperatures using artificial tests and to investigate the relationship between the results of such tests and the agronomic performance and stability of a field grown set of durum wheat (Triticum durum Desf.) genotypes. The artificial laboratory tests employed enabled genotypes to be differentiated on the basis of their cold tolerance, results suggest that genotypes which possess the ability to cold acclimate during winter retain this feature until the booting stage. Means of agronomic traits varied significantly between seasons and genotypes, indicating the presence of significant genotypic variability and differential responses to the growth conditions experienced. No consistent relationships, between the tolerance to low temperatures and agronomic performances, were found due to the confounding effects of terminal heat and drought stresses, acting on the same yield components as the cold stress. Early, freezing tolerant and above average yielding cultivars were identified which serve as genetic source to improve tolerance to low temperatures in short cycle genetic background.
  F. Bahlouli , H. Bouzerzour , A. Benmahammed and K.L. Hassous
  An experiment was conducted, during the successive cropping seasons 1997/98 to 2002/03, to study grain yield performances and yield stability of 10 durum wheat ( Triticum durum Desf.) varieties in order to identify the productive, stable and risk efficient genotypes for a subsistence agriculture. Grain yield analysis showed high seasons and season x genotype interaction effects reducing the genotypic main effect. Regression coefficients, variance across seasons and safety-first indices based on these parameters classified differently the tested genotypes for stability and risks of giving a low yield under stress. FW index was correlated with grain yield, regression coefficient and the mean square of the contribution of the test cultivar to GxS interaction. The EV index did not show a significant correlation with the measured variables. It was possible within the set of genotypes tested to select high yielding and risk efficient cultivars compared to the check cultivar Mohammed Ben Bachir.
  A. Adjabi , H. Bouzerzour C. Lelarge , A. Benmahammed , A. Mekhlouf and A. Hanachi
  The experiment was conducted during six cropping seasons (1997/98 to 2002/03), with the objective to study the relationships between grain yield performance, temporal stability and carbon isotope discrimination of durum wheat (Triticum durum Desf.) genotypes grown under semi-arid conditions of the eastern highlands of Algeria. The results indicated significant season and genotype x season interaction for grain yield and a non significant genotypic main effect. Mrb5 cultivar out yielded the evaluated entries during three out of six cropping seasons, Cyprus 1, Bicre and Daki were the top-yielding genotypes in two seasons and Waha, Belikh 2 and Heider/ Martes// Huevos de Oro, were high yielding during only one cropping season. Heider and Mrb16 showed a relatively high grain yield temporal stability, Derraa had the lowest value. The results of the present study indicated that grain yield measured during six cropping seasons was not significantly correlated with Δ13C measured during one season. This suggested that carbon isotope discrimination could not be suggested as an indirect selection criterion to screen durum wheat genotypes for water use efficiency under the Mediterranean climate of the high plateaus of Algeria.
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