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Estimates of genetic parameters in Mimosa scabrella populations by random and mixed reproduction models



Estimates of genetic parameters in Mimosa scabrella populations by random and mixed reproduction models



Crop Breeding and Applied Biotechnology 6(1): 47-54



Heritabilities and expected selection gains were estimated in nine provenances of Mimosa scabrella Bentham by means of random and mixed reproduction models. In the random model, the relationship coefficient was considered as half-sibs, and in the mixed, relatedness was estimated based on parameters of the mating system. The trait height was measured six months after planting in the field and a progeny sample of each provenance was analyzed by isoenzyme electrophoresis to estimate parameters of the mating system. The mean inbreeding coefficient was 0.392, which is 56.8[percent] higher than expected in half-sib progenies (0.25). The mean estimates of the additive genetic variance, heritability within progenies and gains expected with selection among and within progenies, calculated by the underlying random reproduction model were overestimated, respectively, by 36[percent], 48[percent] and 41[percent], when compared to estimates obtained based on the mixed reproduction model., Herdabilidades e ganhos esperados na selecao foram estimados em nove procedencias de Mimosa scabrella Bentham, usando os modelos aleatorio e misto de reproducao. No modelo aleatorio, o coeficiente de parentesco foi assumido como de meios-irmaos, e no misto, o parentesco foi estimado de parametros do sistema de reproducao. O carater altura foi mensurado seis meses apos o plantio no campo, e uma amostra de progenies de cada procedencia foi analisada por eletroforese de isoenzimas, visando estimar parametros do sistema de reproducao. O coeficiente medio de parentesco foi de 0,392, portanto, 56,8[percent] superior ao esperado em progenies de meios-irmaos (0,25). As estimativas medias da variancia genetica aditiva, herdabilidade dentro de progenies e ganhos esperados na selecao entre e dentro de progenies, calculadas com base no modelo aleatorio de reproducao foram respectivamente superestimadas, em 36[percent], 48[percent] e 41[percent], quando comparadas com as estimativas obtidas com base no modelo misto de reproducao. Reprinted by permission of the publisher.

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