Autocorrelação espacial das freqüências alélicas em subpopulações de cagaiteira (Eugenia dysenterica DC., Myrtaceae) no sudeste de Goiás

Telles, Mariana Pires de Campos; Diniz‐Filho, José Alexandre Felizola; Coelho, Alexandre Siqueira Guedes; Chaves, Lázaro José

doi:10.1590/s0100-84042001000200003

Cited by 14 publications

(29 citation statements)

References 22 publications

(18 reference statements)

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“…This structure was visualized by the dendrogram, Genetic structure and gene flow in Eugenia dysenterica 453 where populations 9 and 10 diverged genetically from the other populations. This population structure is congruent with the results obtained by Telles et al (2001) using isoenzymes, with progeny data of the same populations. The matrix correlation between Nei's genetic distances and the respective geographic distances was high and positive (r = 0.872) and significant at 1% level of probability (Figure 3).…”

Section: Genetic Structuresupporting

confidence: 90%

Genetic structure and gene flow in Eugenia dysenterica DC in the Brazilian Cerrado utilizing SSR markers

et al. 2003

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The "cagaita tree" (Eugenia dysenterica) is a plant found widespread in the Brazilian Cerrado. Its fruit is used for popular consumption and for industrial purposes. This study opens a new perspective for the generation of population genetic data and parameters estimates for devising sound collection and conservation procedures for Eugenia dysenterica. A battery of 356 primer pairs developed for Eucalyptus spp. was tested on the "cagaita tree". Only 10 primer pairs were found to be transferable between the two species. Using a polyacrilamide gel, an average of 10.4 alleles per locus was detected, in a sample of 116 individuals from 10 natural "cagaita tree" populations. Seven polymorphic loci allowed estimation of genetic parameters, including expected average heterozygosity H e = 0,442, among population diversity, R ST = 0,268 and gene flow Nm = 0,680. Results indicated a potential of SSR locus transferability developed for Eucalyptus to other species of different genera, such as in the case of the "cagaita tree". The high genetic diversity among populations detected with SSR markers indicated that these markers are highly sensitive to detect population structure. Estimated Nm values and the existence of private alleles indicated reduced gene flow and consequently possible damage to the metapopulation structure.

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Section: Genetic Structuresupporting

confidence: 90%

Genetic structure and gene flow in Eugenia dysenterica DC in the Brazilian Cerrado utilizing SSR markers

et al. 2003

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“…In the present case, no evidence was observed of stabilization in the variability among populations, indicating that greater phenotypic and genotypic variations could be obtained if collections were made in wider regions. Telles et al (2001a) confirmed this clinal variation pattern by analysis of spatial autocorrelation in populations of the species in the southeastern part of the state.…”

Section: Resultssupporting

confidence: 67%

Genetic structure of natural Eugenia dysenterica DC (Myrtaceae) populations in northeastern Goiás, Brazil, accessed by morphological traits and RAPD markers

Trindade

Chaves

2005

Genet. Mol. Biol.

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The Brazilian Cerrado (Savannah) is a biome with great biodiversity. Many of the species found in this biome have unlimited economic potential and are used by the local population for various purposes. With the opening of the agricultural frontiers in this region, much of the native flora has been replaced by extensive areas of monocultures. Thirteen populations of the Eugenia dysenterica DC species were sampled in the northeast of the state of Goiás, Brazil, to analyze their genetic structure. Morphological traits were measured for all the progeny obtained and some of them were analyzed by using RAPD markers. The natural populations of the species showed high levels of variability for the morphological traits. The phenotypic, genotypic and genetic variabilities as structured in these populations were highly significant among populations, although most of the variability was detected within populations. The phenotypic and genetic variabilities were structured spatially as shown by the positive and highly significant correlation coefficients between the phenotypic and genetic distance matrixes and the geographic distance matrix. The ideal conservation strategy for the species in the region requires sampling of a high number of individuals of each population and also a significant number of populations to ensure suitable effective population sizes.

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“…Our results agree with studies on genetic diversity in E. dysenterica (Telles et al 2001;Zucchi et al 2003) and in E. uniflora (Margis et al 2002;Salgueiro et al 2004). These authors report that there is a greater genetic variation within populations than between them, due to the high ratio of genetic drift observed.…”

Section: Resultssupporting

confidence: 93%

Reproductive success of four species of Eugenia L. (Myrtaceae)

Silva

Pinheiro

2009

Acta Bot. Bras.

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RESUMO -(Successo reprodutivo de quatro espécies de Eugenia L. (Myrtaceae)). Eugenia uniflora, E. punicifolia, E. neonitida e E. rotundifolia são espécies perenes, geralmente de porte arbustivo, que ocorrem na restinga do Parque Municipal Natural de Grumari, região oeste do Município do Rio de Janeiro, Brasil. Possuem flores-pólen do tipo Papaver, hermafroditas, polistêmones e polinizadas por abelhas. O sistema reprodutivo de cada espécie foi avaliado e os resultados mostraram que apenas E. uniflora e E. punicifolia são auto-compatíveis. De cada espécie foi avaliado o sistema de reprodução, as taxas fruto/flor, semente/óvulo e semente/fruto, além das taxas de predação de frutos e sementes e identificação dos seus agentes predadores. Com estes dados foram obtidos a taxa de fecundidade e o sucesso reprodutivo total de cada espécie. O sucesso reprodutivo total das quatro espécies foi muito baixo. Assim, para que no final do processo reprodutivo houvesse uma única semente viável e livre do ataque de herbívoros foi necessária a produção de 312,5 flores de E. uniflora, 9.090,9 de E. neonitida, 11.111,1 de E. punicifolia e 19.230,8 de E. rotundifolia. Em síntese, o sucesso reprodutivo total nas quatro espécies foi influenciado pelo sistema reprodutivo, pela razão semente/óvulo e, principalmente, pelas elevadas taxas de predação de frutos e sementes. A floração em massa destas espécies pode minimizar sua baixa eficiência reprodutiva, garantindo assim, a manutenção de sua dinâmica populacional. Palavras-chave:Eugenia, herbivoria de sementes, Myrtaceae, sistema de reprodução, sucesso reprodutivo ABSTRACT -(Reproductive success of four species of Eugenia L. (Myrtaceae)). Eugenia uniflora, E. punicifolia, E. neonitida and E. rotundifolia are perennial species, usually shrubs, which occur in the restinga of the Grumari Natural Municipal Park, in western Rio de Janeiro, Brazil. They have Papaver-type pollen-flowers that are hermaphrodite, polystemonous and pollinated mainly by bees. An assessment of the breeding systems showed that only E. uniflora and E. punicifolia are self-compatible. The fruit/flower, seed/ovule and seed/fruit ratios were calculated for each species. Fruit and seed predators were identified and predation rates were estimated. Total reproductive success for each species in the restinga was extremely low. In order to have one viable seed free from herbivore attack at the end of the reproductive process, the species would need to produce 312.5 E. uniflora, 9090.9 E. neonitida, 11111.1 E. punicifolia and 19230.8 E. rotundifolia flowers. In short, the reproductive success of the four species is affected by pollination efficiency, low seed/ ovule ratios and mainly, high predation rates. Mass flowering strategy in these species can minimize low reproductive efficiency, thus ensuring the maintenance of population dynamics.

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Autocorrelação espacial das freqüências alélicas em subpopulações de cagaiteira (Eugenia dysenterica DC., Myrtaceae) no sudeste de Goiás

Cited by 14 publications

References 22 publications

Genetic structure and gene flow in Eugenia dysenterica DC in the Brazilian Cerrado utilizing SSR markers

Genetic structure and gene flow in Eugenia dysenterica DC in the Brazilian Cerrado utilizing SSR markers

Genetic structure of natural Eugenia dysenterica DC (Myrtaceae) populations in northeastern Goiás, Brazil, accessed by morphological traits and RAPD markers

Reproductive success of four species of Eugenia L. (Myrtaceae)

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