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Montana State University (MSU) 1988

Physiological measurements of drought stress on spring wheat (Triticum aestivum L.)

Elmi, Abdulkadir Ahmed

Titre : Physiological measurements of drought stress on spring wheat (Triticum aestivum L.)

Auteur : Elmi, Abdulkadir Ahmed

Université de soutenance : Montana State University (MSU)

Grade : Master of Science in Agronomy 1988

Résumé
Six spring wheat (Triticum aestivum L.) cultivars were studied for characteristics associated with drought resistance under dryland in 1986 and 1987. Three of them were hypothesized to be resistant and three susceptible to drought on the basis of regression analysis. Leaf water saturation deficit, leaf diffusive resistance, plant canopy temperature, leaf water potential and soil water depletion were measured. Cultivars differed in leaf diffusive resistance, water saturation deficit, grain yield, kernel weight and kernel number. Leaf diffusive resistance was higher while water saturation deficit was lower for the resistant cultivars. Leaf diffusive resistance and water saturation deficit have some potential for differentiation between drought resistant and susceptible cultivars. Both are feasible, non-destructive and efficient methods that are useful in screening large numbers of genotypes for their resistance to drought. Leaf desiccation with 2% sodium chlorate was also used to simulate drought stress. Plants were sprayed at booting, heading or flowering stages. Reductions in resistant and susceptible cultivars were similar. In 1986 reductions by the desiccant for grain yield, kernel weight and kernel number were 24.2, 21.1 and 19.4% in resistant cultivars and 26.4, 21.6 and 22.6% in susceptible cultivars, respectively. In 1987 reductions for grain yield, kernel weight and kernel number were 24.9, 22.0 and 23.3% in the resistant cultivars and 26.4, 24.2 and 26.0% in the susceptible cultivars, respectively. Leaf desiccation from sodium chlorate appears to simulate some aspects of drought stress. Présentation

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