Influence de la recombinaison sur la variabilité génétique. I. Étude expérimentale

Robert, N.; Kervella, J.; Fouilloux, G.

doi:10.1051/agro:19930404

Cited by 2 publications

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“…Otherwise, a circular mating design manages efficiently the initial germplasm. Mather (1941Mather ( , 1942 (Robert et al, 1993 (Verrier et al, 1990 (Bulmer, 1971 (Cornelius et Dudley, 1974), plans complexes d'intercroisements faisant intervenir plusieurs géniteurs, tant pour les plantes alltogames qu'allogames (Empig, 1971;Doussinault et Trottet, 1981;Gallais, 1981 …”

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Influence de la recombinaison sur la variabilité génétique. II. Étude par simulations

1993

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complement an experimental study of the possible interest for plant breeders of an allele increasing recombination rates. In the first simulation study, 4 populations of 10 individuals were simulated in the case of high (45%), medium (19.6%) and low (6.9%) recombination frequencies. Ten-plant populations were derived by one generation, either from selfing or from crossing in a circular mating design, from each of the 4 populations. For each initial population, the distribution of the genetic variances in the populations obtained by one mating system overlapped widely in the 3 cases of recombination rates considered, whether the initial population presented an excess of coupling phase, or an excess of repulsion phase. An experimental assessment of the effect of recombination rate differences on genetic variability of quantitative traits is therefore likely to be difficult. The second study simulated a recurrent selection program in the case of high (45%), medium (19.6%) and low (9%) recombination rates. The mean genetic value increased somewhat more slowly and reached a slightly lower value for low recombination rates, whereas the genetic variance remained the highest after the second selection cycle. The evolutions in genetic mean values and genetic variances were almost identical for medium and high recombination frequencies. Thus, an allele which increases recombination rates will only be of interest in the case of close linkage or difficult crossing. Otherwise, a circular

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Influence de la recombinaison sur la variabilité génétique. II. Étude par simulations

1993

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Analysis of the genetic effects for several traits in oil palm (Elaeis guineensis Jacq.) populations. I. Population means

Baudouin

Cao

Galláis³

1995

Theoret. Appl. Genetics

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An oil palm experiment was set up in the Ivory Coast to compare the effects of crossing and selfing within two origins, Deli and La Mé, on the mean and the variability of Deli x Mé between-origin hybrids. The originality of the experiment lay in the crossing plan, which provided access to genetic parameters related to additivity, dominance and different components of epistasis. This first part covers the analysis of the components of the mean. The parents used were obtained from four palms, two from each origin. Those of La Mé origin were half-sibs. The common parent came from a wild stand in the Ivory Coast. Those of Deli origin were from two different populations bred in Southeast Asia for several generations from a narrow genetic base. These four parents gave rise to nine Deli x La Mé hybrid populations with double-cousintype links. The additive component is more important within the Deli origin than within the La Mé origin. This may be explained by the large genetic divergence between the two Deli parent palms. On the other hand, the additive(*) additive epistasis is more substantial within the La Mé origin, probably because of inbreeding. The discussion concentrates on how this information should be used when choosing parents to be crossed and tested and to produce improved populations. The crossing plan proposed can be of general use and is suitable for other species in a reciprocal recurrent selection programme.

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Influence de la recombinaison sur la variabilité génétique. I. Étude expérimentale

Cited by 2 publications

References 8 publications

Influence de la recombinaison sur la variabilité génétique. II. Étude par simulations

Influence de la recombinaison sur la variabilité génétique. II. Étude par simulations

Analysis of the genetic effects for several traits in oil palm (Elaeis guineensis Jacq.) populations. I. Population means

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