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Accueil du site → Doctorat → États-Unis → 1996 → Recurrent selection for seed yield in soyabean populations with different percentages of plant introduction parentage

Iowa State University (1996)

Recurrent selection for seed yield in soyabean populations with different percentages of plant introduction parentage

Ininda, Jane

Titre : Recurrent selection for seed yield in soyabean populations with different percentages of plant introduction parentage

Auteur : Ininda, Jane

Université de soutenance : Iowa State University

Grade : Doctor of Philosophy (PhD) 1996

Résumé
Plant introductions (Pis) have been shown to increase the genetic variability for seed yield in soybean [Glycine max. (L.) Merr.] populations. The objective of this study was to evaluate the genetic gain for seed yield from three cycles of recurrent selection in five soybean populations, APIO to API4, formed with different percentages of PI parentage. The percentages of PI parentage were 100% in APIO, 75% in APll, 50% in AP12, 25% in API3, and 0% in API4. In each cycle, 200 F4-derived lines for each population were evaluated and the 20 highest yielding lines were chosen as parents for the next cycle. For this study, the 20 parents of cycles 1, 2, 3 were grown in a randomized complete-block design at three Iowa locations. There was a significant linear increase in seed yield for all populations across the three cycles. The genetic gain for seed yield was 153 kg ha"’ cycle"’ for AP14, 80 for AP13, 85 for AP12, 54 for APll, and 66 for APIO. Although AP14 was reported to have the lowest genetic variability in the cycle 0 population, it exhibited the greatest genetic gain per cycle during the three cycles of selection. The highest yielding line in each cycle also was obtained from AP14. The results indicated that Pis did not enhance the response to recurrent selection for seed yield compared with populations developed from only high-yieldmg adapted cultivars and experimental lines.

Sujets : Glycine max/Genetics/Glycine max/ ;

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