Diversidade genética molecular de progênies de dendezeiro

Abstract

Resumo -O objetivo deste trabalho foi avaliar a diversidade genética, entre e dentro de progênies de dendezeiro tipo dura, de origem Deli. A caracterização genética foi feita com uso de marcadores microssatélites em 24 progênies usadas na produção comercial de sementes, sendo 22 provenientes de autofecundação e duas de cruzamentos entre irmãos completos. Foi realizada análise de variância molecular entre e dentro das progênies, com posterior construção de um dendrograma. Observou-se baixa variabilidade genética nas progênies, com média de 1,32 alelos por loco e variância genética total igual a 0,3241. A maior parte da variação ocorreu entre progênies. A menor variabilidade genética dentro das progênies pode ser explorada nos cruzamentos com progênies endogâmicas de outras origens, o que facilitaria o alcance de heterose para o desenvolvimento de novas variedades.Termos para indexação: Elaeis guineensis, avaliação de progênies, heterose, melhoramento genético. Molecular genetic diversity of oil palm progeniesAbstract -The objective of this work was to assess the genetic diversity between and within progenies of dura type oil palm from Deli. Genetic characterization was performed with microsatellite markers on 24 oil palm progenies used in commercial seed production, of which 22 originated from self-fertilization and two from cross-fertilization between full siblings. Molecular analysis of variance was carried out among and within progenies, and a dendrogram was constructed. Low genetic variability was observed within progenies, with an average of 1.32 alleles per locus and total variance of 0.3241. Most of the variation was found between progenies. The lower genetic variability within progenies can be explored in crossings with endogamic progenies from other origins, which would facilitate heterosis in order to develop new varieties.

Estimation of Outcrossing Rate in Napier Grass

“…The AMOVA results showed that 14% of variance occurred among offspring and 86% occurred within offspring ( Table 2). These results corroborate the expected variance in allogamous species, where crossing occurring naturally between parents and the variation within offspring are low (Glémin et al, 2006;Ferreira et al, 2012). Glémin et al (2006) showed that among various life history traits, mating systems have the greatest influence on patterns of polymorphism.…”

Molecular genetic diversity and mating system in sacha inchi progenies1

“…The analysis also showed that 42.84 % of the genetic variation was found among individuals within families. This shows that the species is preferably cross-fertilized, since allogamous species retain much of their genetic variability distributed within their families, in contrast to self-pollinating species, where most of the genetic variability is between provenances (Ferreira et al 2012).…”

“…Identifying genetically superior progenies that may be recommended for use in seed production would be an important step for improving the crop in Brazil (Valente et al 2017a). However, previous studies are necessary to provide a basis for strategies to make the best of the available genetic resources and to maintain a broad genetic base within breeding programs (Ferreira et al 2012). Genetic markers are a highly efficient tool for investigating the variability between and within progenies.…”

“…The data obtained may help making important decisions, regarding the management and conservation of plant resources. For instance, in reciprocal recurrent selection programs, the knowledge of genetic diversity between and within progenies may speed up the development of new varieties (Ferreira et al 2012).…”

Genetic diversity of long-established populations of Elaeis guineensis jacquin (Arecaceae)

“…Its economic prominence is due to its oil, being one of the world's leading sources of vegetable oil. (FERREIRA et al, 2012;USDA, 2012). E. guineensis oil can be extracted from both the fruit (palm oil) and the nut (palm kernel oil).…”