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University of Arizona (1987)

Effect of inbreeding on germination salt tolerance in alfalfa

Morita, Tateo

Titre : Effect of inbreeding on germination salt tolerance in alfalfa

Auteur : Morita, Tateo

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1987

Résumé
The performance of an alfalfa (Medicago sativa L.) population has been improved by recurrent selection for germination salt tolerance. However, recurrent selection may lead to increased inbreeding. Since alfalfa is subject to severe inbreeding depression, accumulation of inbreeding during the selection process may negatively affect performance. This experiment was designed to determine the effects of inbreeding on germination performance in alfalfa under saline and non-saline conditions. The germination performance of seed having three different levels of inbreeding as examined. No adverse effects of inbreeding were observed in non-saline conditions. Consistent (but nonsignificant) declining trends were observed in germination percentage in saline conditions as the level of inbreeding increased. Proportionately larger declines were observed between generations in germination speed and early seedling vigor. These results suggest heterozygosity in alfalfa may be maintained simultaneously while recurrent selection for germination salt tolerance is conducted. Moreover, reducing inbreeding during recurrent selection for germination salt tolerance may be more successful if germination speed index or early seeding vigor are used for the measurement.

Mots clés : Salt-tolerant crops. ; Alfalfa — Breeding. ; Plant genetics.

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Page publiée le 8 février 2016, mise à jour le 19 février 2018