Allozyme variability and evolution of lodgepole pine (Pinus contorta var. latifolia) and jack pine (P. banksiana) in Alberta

Dancik, Bruce P.; Yeh, Francis C.

doi:10.1139/g83-011

Cited by 94 publications

(52 citation statements)

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“…An analysis of Mexican germoplasm showed that 72% of the variation occurred within the collections and 28% was due to differences between them (Doebley et al, 1985). In conifers, this value usually exceeds 90% (Guries and Ledig, 1982;Dancik and Yeh, 1983;Moran et al, 1988). According to Hamrick and Loveless (1986), there is a general tendency for outcrossing plant species to show little or no differentiation among populations.…”

Section: Discussionmentioning

confidence: 99%

Isoenzymatic variation in the germplasm of Brazilian races of maize (Zea mays L.)

Gimenes

Lopes

2000

Genet. Mol. Biol.

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There are more than 200 races of maize (Zea mays L.) divided into three groups (ancient commercial races, the recent commercial races, and indigenous races). Although the indigenous races have no commercial value, they have many important characteristics which can be incorporated into maize breeding programs. Most Brazilian indigenous germplasm race stocks were collected at least 40 years ago, and nothing is known of the genetic variability present in this germplasm. The genetic variability was assayed in 15 populations from four indigenous races of maize (Caingang, Entrelaçado, Lenha and Moroti) and five indigenous cultivars, using five isoenzymatic systems encoded by 14 loci. The analysis revealed a low level of variability among the samples studied. Overall, the mean number of alleles/polymorphic locus was three, 64.3% of the loci analyzed being polymorphic and the estimated heterozygosity was 0.352. The mean number of alleles/polymorphic locus per population was 1.6. A mean of 47.5% of the loci were polymorphic. The mean expected heterozygosity was 0.195, the mean genetic identity was 0.821 and the proportion of total genetic diversity partitioned among populations (Gst) was 0.156. A founder effect could explain the low variability detected.
Existem mais de 200 raças de milho (Zea mays L.), as quais são divididas em três grupos (raças comerciais antigas, raças comerciais recentes e raças indígenas). As raças indígenas, embora não tenham valor comercial, possuem muitas características importantes que podem ser utilizadas em programas de melhoramento de milho. A maior parte do germoplasma brasileiro das raças de milho indígena foi coletada, no mínimo, 40 anos atrás e nada é conhecido sobre a variabilidade presente neste germoplasma. Quinze populações de 4 raças indígenas de milho (Caingang, Entrelaçado, Lenha e Moroti) e 5 cultivares indígenas foram analisados utilizando-se 5 sistemas isoenzimáticos codificados por 14 locos. A análise revelou um baixo nível de variabilidade entre as amostras estudadas. O número médio de alelos/loco foi três, com 64,3% de locos polimórficos e uma heterozigosidade média esperada de 0,352. Por população, a média de número de alelos por loco polimórfico foi 1,6, em média 47,5% dos locos foram polimórficos e a heterozigosidade média foi 0,195. A distância genética média entre as populações foi 0,821 e a proporção da variabilidade genética, que é atribuída ao componente entre populações (Gst), foi 0,156. Os dados sugerem que um efeito de fundador poderia explicar a baixa variabilidade detectada

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Section: Discussionmentioning

confidence: 99%

Isoenzymatic variation in the germplasm of Brazilian races of maize (Zea mays L.)

Gimenes

Lopes

2000

Genet. Mol. Biol.

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“…Inmost studied species, values of FST tend indeed to be lower than 0100 and provide evidence that genotypic heterogeneity is generally rather low. The Beech shows the highest estimates among the anemophilous forest tree species, with only two exceptions: Pinus banksiana and Pinus halepensis which reach values about 0120 (Grunwald et a!., 1986;Dancik and Yeh, 1983;O'Reilly et a!., 1985;Plessas and Strauss, 1986). Higher values of ST could be due to the larger area and higher number of investigated stands but, however, any generalization is not possible regarding the lower number of loci.…”

Section: Discussionmentioning

confidence: 99%

Allozymic variability in beechwoods (Fagus sylvatica L.) over central Europe: spatial differentiation among and within populations

Thiébaut¹,

Paule

Merzeau

et al. 1990

Heredity

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“…Until now, studies on spatial distribution of diversity have focused mainly on the pattern of variation over widespread geographical zones (Wheeler & Guries, 1982;Dancik & Yeh, 1983;Ledig & Conckle, 1983;Kremer et at., 1991). Recent work has shown that within tree populations, in many cases, gene diversity is not randomly distributed (Knowles, 1991;Perry & Knowles, 1991;Sork et at., 1993).…”

Section: Introductionmentioning

confidence: 99%

Intraspecific genetic structure in a mixed population of Quercus petraea (Matt.) Leibl and Q. robur L.

1994

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The intraspecific genetic structure of a mixed population of sessile and pedunculate oak was studied in the Petite Charnie Forest, Sarthe, France, using enzyme electrophoresis. Spatial structure was analysed by calculating F-statistics and autocorrelations at different scales of spatial subdivision of the population. F-statistics were also used to compare the genetic structure of groups of trees subdivided according to the phenology of flowering. Spatial organization of phenology of flowering was studied with autocorrelation methods. In both species, a highly significant heterozygote deficiency was found at the population level. Spatial genetic structure was at least partially responsible for this deficiency, as demonstrated by the variations observed in F-statistics in relation to the size of this population subdivision. The significance of the observed structure was confirmed by comparison with a null hypothesis generated with the help of permutation analysis. We suggest that the limited dispersal of pollen and/or seeds in the stand gave rise to a family structure. The autocorrelation in phenology of flowering found in both species could contribute to lower the neighbourhood size and then to increase the Wahlund effect. Autocorrelation analyses allowed us to show that heterogeneity of patterns of structure among loci was present. Other possible causes of the genetic structure and its heterogeneity are discussed.

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Allozyme variability and evolution of lodgepole pine (Pinus contorta var. latifolia) and jack pine (P. banksiana) in Alberta

Abstract: not available

Cited by 94 publications

References 0 publications

Isoenzymatic variation in the germplasm of Brazilian races of maize (Zea mays L.)

Isoenzymatic variation in the germplasm of Brazilian races of maize (Zea mays L.)

Allozymic variability in beechwoods (Fagus sylvatica L.) over central Europe: spatial differentiation among and within populations

Intraspecific genetic structure in a mixed population of Quercus petraea (Matt.) Leibl and Q. robur L.

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