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Genetic structure of Acer platanoides and Betula pendula in northern Europe

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Marker variation was measured in 12 Acer platanoides L. and 9 Betula pendula Roth populations using 11 and 18 allozyme loci, respectively. Both species grow in the boreal–temperate zone. Insect-pollinated A. platanoides with limited seed dispersal has a scattered occurrence, while wind-pollinated B. pendula with light wind-dispersed seeds has a more continuous distribution. The average expected heterozygosity was 0.132 for A. platanoides and 0.141 for B. pendula. Genetic differentiation among A. platanoides populations (Fst = 0.099) was higher than that of B. pendula (Fst = 0.032). Expected heterozygosities in marginal and central populations of A. platanoides were at approximately the same level. Contrary to the expectation, differentiation was higher among central populations.

Les auteurs ont mesuré la variabilité découlant de marqueurs génétiques parmi 12 populations d'Acer platanoides L. et 9 populations de Betula pendula Roth; deux espèces qui croissent dans la zone tempérée boréale. L'analyse a porté sur respectivement 11 et 18 loci d'alloenzymes. Acer platanoides est caractérisé par une pollinisation entomophile, une dispersion limitée des semences et une présence sporadique. Chez B. pendula, la pollinisation est anémophile et les semences sont légères et dispersées par le vent. En outre, cette espèce possède une distribution plus continue. L'hétérozygotie espérée moyenne était de 0,132 pour A. platanoides et de 0,141 pour B. pendula. La différenciation génétique parmi les populations était plus élevée chez A. platanoides (Fst = 0,099) que chez B. pendula (Fst = 0,032). Les hétérozygoties espérées étaient approximativement les mêmes pour les populations centrales et marginales d'A. platanoides. Contrairement aux attentes, la différenciation était plus élevée parmi les populations centrales.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: June 1, 2003

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