Genetic variation in English oak (Quercus robur) in Finland.

Mattila, Anu; Pakkanen, A.; Vakkari, Pekka; Raisio, Juha

doi:10.14214/sf.a9177

Cited by 15 publications

(14 citation statements)

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“…Dotted lines group populations in three main regions (I, II, III) according to their geographical proximity, with the exception of population 11 (Monte Acuto) (G STn = 0.11 and G STc = 0.34) among French stands using nuclear and chloroplast DNA markers, respectively. Our results were roughly consistent with previous investigations based on allozyme variation in other forest tree species with scattered distribution and small population size, revealing a much higher genetic differentiation than the ones observed in Sorbus torminalis (Prat et al 1992;Gibson and Wheelwright 1995;Machon et al 1997;Mattila and Vakkari 1997). A pronounced differentiation among populations was also reported in earlier studies, based on RAPD markers, for animal-dispersed tree species with a scattered occurrence, such as Prunus mahaleb and Taxus baccata (Jordano and Godoy 2000;Hilfiker et al 2004b).…”

Section: Discussionsupporting

confidence: 93%

A population genetic study in a scattered forest species, wild service tree [Sorbus torminalis (L.) Crantz], using RAPD markers

2007

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Wild service tree [Sorbus torminalis (L.) Crantz] is a forest tree widespread in Europe, characterized by a scattered distribution. Its hermaphroditic flowers are pollinated by insects, and outcrossing is the prominent mating system, also due to the presence of gametophytic self-incompatibility. Genetic diversity and differentiation of 22 populations from northwestern Italy were investigated by means of variation scored at 53 polymorphic RAPD (Random Amplified Polymorphic DNA) loci. Populations differed in genetic variation, with Shannon diversity index ranging from 0.166 to 0.469. According to Analysis of Molecular Variance (AMOVA), most of the genetic variation was found within populations (61.78%) with a significant proportion of variance attributable to genetic differences between regions (23.60%) and between populations (14.62%). Evidence for isolation by distance was found in the set of populations sampled. The effect of habitat fragmentation on genetic variation was also evaluated. The efficacy of RAPD markers in analysing genetic variation, and the contribution of the results in terms of the preservation of biodiversity are discussed.

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Section: Discussionsupporting

confidence: 93%

A population genetic study in a scattered forest species, wild service tree [Sorbus torminalis (L.) Crantz], using RAPD markers

2007

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“…The expected heterozygosities for Danish Q. petraea and Q. robur resemble those found in other investigations (Kremer et al 1991, Mü ller-Starck et al 1993, Zanetto et al 1994; however, direct comparisons should be made with care owing to varying systems and methods (Mü llerStarck et al 1992). An investigation on Finnish stands of Q. robur showed a smaller diversity of 0.188 (Mattila et al 1994). As in the present study, only small differences in gene diversity have been recorded between Q. petraea and Q. robur.…”

Section: Genetic Di×ersitycontrasting

confidence: 52%

Intrapopulation and Interpopulation Genetic Variation of Quercus in Denmark

Siegismund

Jensen²

2001

Scandinavian Journal of Forest Research

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Native Danish oak stands are fragmented and decreasing because of the extensive use of foreign seed sources. Therefore, the population structure of natural Danish oak stands was analysed by means of six polymorphic enzyme loci. A total of 17 stands of Quercus robur L. (including an ''outgroup'' sample from The Netherlands), seven Quercus petraea [Matt.] Liebl. and two putative hybrid stands were included in the study. The average genetic diversity was similar for the two species as well as for the putative hybrid stands: 0.25 for Q. robur, 0.27 for Q. petraea and 0.26 for the hybrid stands. The genotypic proportions at two (Pgm and Mnr) of the six loci showed many signi cant deviations from Hardy-Weinberg expectations, always with an excess of homozygotes, whereas the remaining four loci accorded to Hardy-Weinberg proportions, suggesting a low level of inbreeding. The differentiation of the Q. petraea and Q. robur populations was quanti ed with Wright's F-statistics. The within-species component was low, 0.022, re ecting the wind-pollinated reproductive mode of the two species. The betweenspecies component was 10-fold higher, 0.235, indicating two separate groups. A phylogenetic tree estimated from allele frequencies also supported the presence of these two groups. Despite the two well-separated groups in the tree, it was not possible to assign all individuals to the species to which they supposedly belonged. In total, 10% of the Q. robur individuals and 14% of the Q. petraea individuals were assigned to the other species, suggesting a limited amount of introgression between the two species.

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“…The use of chloroplast DNA haplotypes makes discrimination between female and male migrants easy. In species with a scattered distribution among-population variation may be revealed, as was the case for Ulmus laevis Finnish populations (Mattila and Vakkari 1997). However, this kind of among-population differentiation is probably not adaptive, rather it may be attributed to genetic drift in small marginal populations.…”

Section: Markersmentioning

confidence: 94%

Evolutionary forces influencing variation among populations of Pinus sylvestris

Eriksson¹

1998

Silva Fenn.

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Eriksson, G. 1998. Evolutionary forces influencing variation among populations of Pinus sylvestris. Silva Fennica 32(2): 173-184.The evolutionary forces influencing genetic differentiation among populations are identified. Natural selection, random genetic drift, and mutations promote differentiation while phenotypic plasticity and gene flow delay or prevent differentiation. Evolution is a dynamic force which leads to instability and absence of any perfection in the adaptive process. Natural selection acts mainly on phenotypes and only indirectly on the components of important breeding traits. In the northern part of the distribution of Scots pine there is a large among-and within-population variation in survival. The high amongpopulation variation occurs in spite of an assumed high gene flow. Biomass is a product of many components and it also shows a high population variation. Many markers are neutral and such markers will not reveal adaptive variation.

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Genetic variation in English oak (Quercus robur) in Finland.

Cited by 15 publications

References 0 publications

A population genetic study in a scattered forest species, wild service tree [Sorbus torminalis (L.) Crantz], using RAPD markers

A population genetic study in a scattered forest species, wild service tree [Sorbus torminalis (L.) Crantz], using RAPD markers

Intrapopulation and Interpopulation Genetic Variation of Quercus in Denmark

Evolutionary forces influencing variation among populations of Pinus sylvestris

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