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Accueil du site → Master → Etats Unis → 1986 → RECURRENT SELECTION FOR GERMINATION SALT TOLERANCE IN ALFALFA (SALINITY, FORAGES, BREEDING)

University of Arizona (1986)

RECURRENT SELECTION FOR GERMINATION SALT TOLERANCE IN ALFALFA (SALINITY, FORAGES, BREEDING)

Robinson, David Lowell

Titre : RECURRENT SELECTION FOR GERMINATION SALT TOLERANCE IN ALFALFA (SALINITY, FORAGES, BREEDING)

Auteur : Robinson, David Lowell

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1986

Résumé
The germination salt tolerance of alfalfa (Medicago sativa L.) has been improved by eight cycles of recurrent phenotypic mass selection. Eight experiments were made on germplasm from this breeding program to characterize the progress that has been made and to assist in the selection process. An osmotic gradient was used to show that the range of germination has been extended by about 1 MPa. A progeny test revealed that although selection had increased speed of germination under stress, germination percent and speed were not correlated (r -.02) ; this information was used to enhance selection efficiency. There was no relationship found between seed size and salt tolerance (r -.05). The pattern of moisture uptake by seed was examined. Stress affect on seed was seen within hours of planting and rates of water uptake were found to be influenced by the type of solution imbibed. Seedling growth after germination appeared to be more sensitive to salt stress than before germination.

Mots clés : . Alfalfa — Seeds. ; Germination. ; Plants — Effect of salt on.

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