Genetic structure of plantations and the conservation of genetic resources of Brazilian pine (Araucaria angustifolia)

Stefenon, Valdir Marcos; Gailing, Oliver; Finkeldey, Reiner

doi:10.1016/j.foreco.2008.01.036

Cited by 48 publications

(48 citation statements)

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“…Mixing of material from several source populations potentially increases the diversity of plantations (Stefenon et al, 2008). However, the increase of diversity depends on the differentiation among source populations and disappears if populations are not differentiated from each other.…”

Section: Genetic Consequences Of Plantation Establishmentmentioning

confidence: 99%

Genetic similarity of natural populations and plantations of Pinus roxburghii Sarg. in Nepal

et al. 2009

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Abstract• Genetic structures of five population pairs each consisting of one natural population and one neighbouring plantation of Pinus roxburghii Sarg. in Nepal were assessed using nuclear (nSSRs) and chloroplast microsatellite loci (cpSSRs).• The mean number of alleles at nSSRs loci in natural populations was 5.0 compared to 4.93 in plantations while the average observed heterozygosities were the same in both groups (H 0 = 0.50). Most of the alleles were common to all the populations, indicating that the populations correspond to a single genetic entity. Similarly forty-seven haplotypes were observed in natural populations compared to fifty haplotypes in plantations. Mean haplotype diversities of natural populations (0.953) and plantations (0.955) were very similar. Genetic diversity of Pinus roxburghii was relatively high with low or no evidence of inbreeding while genetic differentiation among all populations was very low (about 1%).• The very low differentiation among natural populations indicates efficient long-distance gene flow among populations resulting in homogeneous genetic structures at least at selectively neutral loci. Even though the harvest and production of seeds and seedlings was largely uncontrolled, genetic structures of most plantations show no signs of reduced variation, inbreeding or other negative effects compromising the adaptedness or adaptability of planted forests. • Les structures génétique de cinq paires de populations composées chacune d'une population naturelle et d'une plantation voisine de Pinus roxburghii Sarg. au Népal ont été évalués à l'aide de loci nucléaires (nSSRs) et de loci microsatellites chloroplastiques (cpSSRs). Mots• Le nombre moyen d'allèles à loci nSSRs dans les populations naturelles était de 5,0 comparé à 4,93 dans les plantations alors que la moyenne des hétérozygoties observées étaient les mêmes dans les deux groupes (H 0 = 0,50). La plupart des allèles étaient communs à toutes les populations, indiquant que les populations correspondent à une seule entité génétique. De même, quarante-sept haplotypes ont été observés dans les populations naturelles par rapport à cinquante haplotypes dans les plantations. La diversité moyenne des haplotypes des populations naturelles (0,953) et des plantations (0,955) étaient très similaires. La diversité génétique de Pinus roxburghii a été relativement importante, avec peu ou pas de preuve de consanguinité tandis que la différenciation génétique entre les populations était très faible (environ 1 %).• Le très faible différenciation entre les populations naturelles indique des flux de gènes efficaces à longue distance entre les populations issues de structures génétiques homogènes avec au moins une sélectivité neutre des loci. Même si la récolte et la production de semences et de plants ont été largement incontrôlées, les structures génétiques de la plupart des plantations ne montrent aucun signe de réduction de la variation de la consanguinité ou d'autres effets négatifs compromettant la faculté d'adaptation des forêts plant...

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Section: Genetic Consequences Of Plantation Establishmentmentioning

confidence: 99%

Genetic similarity of natural populations and plantations of Pinus roxburghii Sarg. in Nepal

et al. 2009

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“…We suspect in the case of C. sempervirens that the number of planted population generations is still too low to significantly lower genetic diversity in these plantations (Stefenon et al, 2008); such a decline could, however, still be manifested in future generations (Lowe et al, 2005). Indeed, a study by El-Kassaby and Ritland (1996) found that genetic diversity decreased only in the second planted progeny generation of Pseudotsuga menziesii.…”

Section: Genetic Diversitymentioning

confidence: 94%

“…Furthermore, genetic differentiation could also reflect different seed source origins. The result that the 2 groups of natural and planted populations of P. brutia in the semiarid region harbored no genetic differentiation between them suggests that plantations maintained genetic information very similar to that of natural populations from the same geographic region (Stefenon et al, 2007;Stefenon et al, 2008;Gauli et al, 2009). In P. brutia, cluster analyses showed no clear geographic pattern; this finding was also demonstrated in previous studies on P. brutia (Kandemir et al, 2004;Lise et al, 2007).…”

Section: Genetic Variance Partitioning and Differentiationmentioning

confidence: 98%

“…Surprisingly, some studies have found similar or even higher levels of genetic diversity in seed orchards or plantations than in natural populations (Bergmann and Ruetz, 1991;Chaisurisri and El-Kassaby, 1994;El-Kassaby and Ritland, 1996;Wellman et al, 2003;İçgen et al, 2006;Stefenon et al, 2008), which potentially highlights the importance of seed source in cultivation.…”

Section: Genetic Diversitymentioning

confidence: 99%

“…Given that some RAPD markers might be affected by selection if they are of close linkage to loci that experience different selection pressure (Latta and Mitton, 1997), genetic differentiation can increase when the selection is strong (Le Corre and Kremer, 2003). We suspect that such a pattern of among-plantation genetic differentiation was created because unsuitable seedlings were discarded during the silvicultural selection process (Edwards and El-Kassaby, 1996;Korshikov et al, 2004;Stefenon et al, 2008). The likely fact that seeds originated from only a few populations, and that planted progenies were derived from a low number of seed trees, could also have led to a stronger genetic differentiation among plantations (El-Kassaby and Namkoong, 1994;Gauli et al, 2009).…”

Section: Genetic Variance Partitioning and Differentiationmentioning

confidence: 99%

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Genetic structure of plantations and the conservation of genetic resources of Brazilian pine (Araucaria angustifolia)

Cited by 48 publications

References 38 publications

Genetic similarity of natural populations and plantations of Pinus roxburghii Sarg. in Nepal

Genetic similarity of natural populations and plantations of Pinus roxburghii Sarg. in Nepal

Genetic comparison between natural and planted populations of Pinus brutia and Cupressus sempervirens in Syria

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