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Title: Reproductive strategy and ploidy determine the genetic variability of Sorbus aria
Authors: Sosa, Pedro A. 
González-González, Edna A.
González Pérez,Miguel Ángel 
Naranjo-Cigala, Agustín 
Carqué, Eduardo
Acevedo, Aurelio
UNESCO Clasification: 241714 Genética vegetal
Keywords: Apomixis
Asexual reproduction
Canary Islands
Genetic variability, et al
Issue Date: 2014
Publisher: 1614-2942
Project: Biología de la Conservación de Endemismos Vegetales de Los Parques Canarios: Caracterización Genética y Demográfica. 
Journal: Tree Genetics and Genomes 
Abstract: Sorbus aria (L.) Crantz (common whitebeam) from the Canary Islands has not been characterised genetically. We analysed the genetic variability of 184 individuals belonging to seven natural populations of S. aria from the Canarian Archipelago and the Iberian Peninsula. Our main aims were to obtain essential information to enable the exploration of the genetic relationship between populations from the Canary Islands and the Iberian Peninsula; to establish the existence of a spatial genetic structure and formulate appropriate management and conservation genetics strategies. Genetic variation was analysed using nine polymorphic microsatellite loci. The Canary Island populations (triploids) were found to have very low genetic variability and to be considerably differentiated from the populations from the peninsula (diploid and triploid), although with a connection to the Sierra Nevada population in the south of the Peninsula. This population, in turn, had many different genotypes, which is indicative of the existence of various origins. The level of genetic diversity was higher in all-diploid populations, which, in addition, presented a greater interpopulation gene flow, possibly the result of a prevalence of sexual reproduction. On the other hand, the triploid populations presented lower levels of genetic variability, with a significant degree of fixed heterozygosity, possibly due to asexual reproduction, mainly by apomixis. The reproductive biology and ploidy appear to be responsible for the levels of genetic variability in S. aria.
ISSN: 1614-2942
DOI: 10.1007/s11295-014-0713-5
Source: Tree Genetics and Genomes [ISSN 1614-2942], v. 10, p. 679-688
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