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Accueil du site → Doctorat → États-Unis → 1981 → Preliminary evaluation of selection criteria for drought resistance in alfalfa (Medicago sativa L.)

Montana State University (MSU) 1981

Preliminary evaluation of selection criteria for drought resistance in alfalfa (Medicago sativa L.)

Carlson, John Robert

Titre : Preliminary evaluation of selection criteria for drought resistance in alfalfa (Medicago sativa L.)

Auteur : Carlson, John Robert

Université de soutenance : Montana State University (MSU)

Grade : Doctor of Philosophy in Crop and Soil Science 1981

Résumé
Drought reduces alfalfa yield and quality. The objectives of this study were to : I) develop screening procedures to assay alfalfa germplasm for drought resistance traits, and 2) determine if genetic progress could be made for these traits. . Traits studied included stomatal density, seedling root pattern, resistance to wilting, leaf color, leaflet size, and germination salt tolerance. The considerable amount of within-plant variability for stomatal density existing in alfalfa, necessitating the sampling of leaflets from an extremely large number of stems, prevented the use of this trait as a selection criterion for drought resistance in alfalfa. Selection for seedling root pattern and for resistance to wilting indicated that these traits were lowly heritable. Selection for these traits will result in slow progress. Selection for leaf color, leaflet size, and germination salt tolerance indicated that these traits were highly heritable. Selection for these traits will result in rapid progress. Présentation

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