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Accueil du site → Doctorat → Royaume-Uni → 1995 → Genetic studies on the drought resistance of some barley collections from arid and semi-arid lands (BL)

University of Birmingham (1995)

Genetic studies on the drought resistance of some barley collections from arid and semi-arid lands (BL)

Ghebru, B

Titre : Genetic studies on the drought resistance of some barley collections from arid and semi-arid lands (BL)

Auteur : Ghebru, B

Université de soutenance : University of Birmingham

Grade : Doctor of Philosophy (PhD) 1995

Résumé
The present study was a genetic study of some characters related to the drought resistance of barley varieties from arid and semi-arid regions. Four experiments were carried out for this purpose. In the preliminary stage, 46 lines of the barley collections provided by the International Center of Agricultural Research in Dry Areas (ICARDA) and the International Plant Genetic Resources Center in Ethiopia (IBPGR/E) were evaluated for their drought resistance capabilities using two sets of experiments : in the glasshouse and in the laboratory. Results from the field screening trial showed the lines differed significantly for a number of physiological and morphological characters related to drought resistance, such as the leaf solute potential ( s), relative water content (RWC), survival ratings as well as yield performances. Significant line x treatment interaction was present for all yield and related characters, duration parameters and survival. The laboratory experiment consisted of germination studies using polyethylene glycol (PEG) as a drought simulating agent and the germination percentage, length of coleoptile and radicle were evaluated. Significant variation between lines was observed for all the germination characters, but line x treatment interaction was only present for the percentage of germination. Based on the combined evaluation of the lines from both the preliminary experiments, a total of 12 lines were identified for their high and low performance under drought conditions for further evaluation and genetic studies. A third glasshouse pot experiment was set up for a detailed evaluation of the lines. Several physiological (RWC, leaf solute potential, proline accumulation), morphological (leaf length and width, leaf death, wilting) and yield and yield components characters were studied. A considerable amount of genetic variation and line differences were observed with regard to the leaf solute potential, RWC, proline accumulation, several of the morphological and yield characters.

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