Genetic diversity within an isolated olive (Olea europaea L.) population in relation to feral spread

Mekuria, Genet Teshome; Collins, Graham; Sedgley, Margaret

doi:10.1016/s0304-4238(01)00375-2

Cited by 34 publications

(19 citation statements)

References 20 publications

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“…The percentage of polymorphic bands was 53.5, 53.9%, and 62% for the populations of Erechim, Barão de Cotegipe, and São José, respectively (as shown in Table 2). These values can be considered low if compared to the results obtained by Bittencourt (2000) in M. ilicifolia (84.6%), and other arboreal species such as Acacia raddiana with 90.69% (Shrestha et al, 2002), and Olea europaea with 91.5% (Mekuria et al, 2002) polymorphic bands.…”

Section: Resultsmentioning

confidence: 68%

Intra and inter populational genetic variability in Maytenus ilicifolia Mart. ex Reiss. 1861, through RAPD markers

et al. 2007

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Maytenus ilicifolia is a medicinal plant largely used in the South Brazilian folk medicine. The aim of this study was to quantify the intra and inter populational genetic variability in three populations of M. ilicifolia, focusing on the genetic conservation of this species, which has been threatened by anthropic action. RAPD (Random Amplified Polymorphic DNA) markers were used to analyze 30 plants of each of the three populations collected in the Alto Uruguai Gaúcho region. Fourteen selected primers generated a total of 158 bands, 71.5% of which were polymorphic. The comparison of Jaccard's distances showed that the intra populational variation was higher than the inter populational variability, and cluster analysis allowed the separation of the three populations. Just 7.6% of the bands were specific of at least two populations. Data indicate that the analyzed M. ilicifolia populations represent a single genetic pool, and therefore any of the population thoroughly can represent the overall genetic variability of the species in the sampled region.Keywords: conservation, espinheira santa, native populations, molecular markers. Variabilidade genética intra e interpopulacional em Maytenus ilicifolia Mart. ex Reiss, utilizando marcadores RAPD ResumoMaytenus ilicifolia é uma planta medicinal bastante utilizada na medicina popular da região sul do Brasil. O objetivo deste estudo foi quantificar a variabilidade genética intra e interpopulacional em três populações de M. ilicifolia visando a conservação genética desta espécie, que se encontra ameaçada pela ação antrópica. Marcadores RAPD (Random Amplified Polymorphic DNA) foram utilizados para analisar 30 plantas de cada uma das três populações coletadas na região do Alto Uruguai Gaúcho. Foram selecionados 14 primers, que geraram 158 bandas, das quais 71,5% foram polimórficas. A comparação das distâncias de Jaccard mostraram que a variabilidade intra populacional foi maior que a interpopulacional, e a análise de agrupamentos permitiu a separação das três populações. Somente 7.6% das bandas foram específicas de pelo menos duas populações. Os resultados indicam que as populações de M. ilicifolia analisadas representam um único conjunto gênico, de tal forma que qualquer uma das populações pode representar a variabilidade genética geral da espécie na região.

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Section: Resultsmentioning

confidence: 68%

Intra and inter populational genetic variability in Maytenus ilicifolia Mart. ex Reiss. 1861, through RAPD markers

et al. 2007

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“…In several recent studies using dominant nuclear markers (eg RAPDs, AFLPs and ISSRs), a substantial, but not complete, discrimination was observed between cultivars from various geographical origins and oleasters from populations distributed over the Mediterranean Basin, each represented by a single individual tree, although no genetic marker was identified by the authors to discriminate unambiguously between wild oleasters and the putative feral forms (Angiolillo et al, 1999;Besnard et al, 2001a;Vargas and Kadereit, 2001;Bronzini de Caraffa et al, 2002a, b). Such results were observed even when the oleasters were collected in disturbed areas close to olive groves and were considered as being of feral origin (Angiolillo et al, 1999), and also in feral oleasters growing in Australia, where genuinely wild olive (in O. europaea) is not expected to grow (Mekuria et al, 2002). From the results of the present work, we suggest that the nuclear genetic differentiation observed between oleasters (whatever their origin) and cultivated olive may be attributable mostly to heterozygosity level differences and, very occasionally, to distinct allelic composition between these two fully interfertile partners of the same species.…”

Section: Geographic Allozyme Variation In Oleastersmentioning

confidence: 94%

Allozyme variation of oleaster populations (wild olive tree) (Olea europaea L.) in the Mediterranean Basin

et al. 2004

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As a result of the early domestication and extensive cultivation of the olive tree throughout the Mediterranean Basin, the wild-looking forms of olive (oleasters) presently observed constitute a complex, potentially ranging from wild to feral forms. Allozyme variation was analysed at 10 loci in 31 large and 44 small oleaster populations distributed in various habitats of the Mediterranean Basin and in two populations of the wild subspecies Olea europaea subsp (ssp) guanchica, endemic to the Canary islands and closely related to oleasters. At eight polymorphic loci, 25 alleles were identified. Genetic evidence that nondomesticated oleasters still survive locally was provided by the occurrence of four and one alleles shared exclusively by the eight western and two eastern oleaster populations, respectively, which were collected in forests potentially containing genuinely wild forms according to environmental, historical and demographic criteria. As reported previously from cytoplasmic and RAPDs analysis, substantial genetic differentiation was observed between the eastern oleaster populations genetically close to most olive clones cultivated in the Mediterranean Basin, and the western populations that are related to the wild Canarian populations. In addition, the occurrence of significantly lower heterozygosity in cultivated olive than in oleasters, whatever their origin, suggests that intensive selection involving inbreeding has taken place under cultivation to obtain particular characteristics in the olive cultivars.

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“…europaea (Green, 2002) and comprise olive cultivars grown for oil or table olives. In addition to these two olive forms, a third form resembling oleasters by their physiognomy, has escaped from cultivation, and has been called feral form (Besnard et al, 2001;Mekuria et al, 2002;Breton et al, 2006a).…”

Section: Olea Europaea Trees Spread In the Mediterraneanmentioning

confidence: 99%

Stone diversity in wild and cultivated olive trees (Olea europaea L.)

Hannachi¹,

Gómez²,

Saadaoui³

et al. 2017

Dendrobiology

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Abstract:The olive tree is represented in Tunisia by two varieties: var. sylvestris (wild olive trees) and var. europaea (cultivated olive trees including diverse cultivars). Seed (stone) size and shape analysis may provide the basis for relationships between varieties and cultivars as well as to study the responses to environmental conditions. A semi-automated method of image analysis allows to obtain data related with magnitudes descriptive of stone size and shape and to compare between wild and cultivated olives. Also, the effect of bioclimate on size and shape was analyzed in some cultivars. Stone size and shape presents high variability. In cultivated trees stones are larger. Mean seed image area is 0.38 and 0.75 cm² for wild and cultivated plants respectively. Roundness and circularity were compared as to their potential to define seed shape. Mean values were higher for circularity, but roundness is more variable reaching higher values in some individuals and varieties. Roundness is more useful to compare seed shape variations. In addition, climate factors affect the stone characteristics in cultivars; those of sub-humid region having larger stones. Phenotypic parameters of stone are discriminating parameters for the analysis of intra-specific, intra-varieties and intra-cultivars variability in Olea europaea.

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Genetic diversity within an isolated olive (Olea europaea L.) population in relation to feral spread

Cited by 34 publications

References 20 publications

Intra and inter populational genetic variability in Maytenus ilicifolia Mart. ex Reiss. 1861, through RAPD markers

Intra and inter populational genetic variability in Maytenus ilicifolia Mart. ex Reiss. 1861, through RAPD markers

Allozyme variation of oleaster populations (wild olive tree) (Olea europaea L.) in the Mediterranean Basin

Stone diversity in wild and cultivated olive trees (Olea europaea L.)

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