Several small: how inbreeding affects conservation of Cariniana legalis Mart. Kuntze le plus grand arbre de la Mata Atlantica/Varias pequenas: como afecta la endogamia a la conservacion de Cariniana legalis Mart

• Published in: The international forestry review 2016-12, Vol.18 (4), p.502
• Main Authors: Tambarussi, E.V, Boshier, D.H, Vencovsky, R, Freitas, M.L.M, Di-Dio, O.J, Sebbenn, A.M
• Format: Article
• Language: English
• Subjects: Observations; Plant breeding; Trees (Plants); Tropical plants
• ISSN: 1465-5489

We investigated the impact of population size on genetic diversity, inbreeding and mating system in small remnant stands of the Neotropical tree, Cariniana legalis, using microsatellite loci. All adult trees within three different size stands (4, 22 and 65 trees) were sampled, along with open-pollinated seeds. A number of impacts related to population size were evident. Allelic richness was significantly lower among progeny in the smallest fragment, as was outcrossing rate. Individual tree outcrossing rates were predominantly high, but several trees presented significant mating among relatives. The correlation of paternity within fruits was significantly higher than among fruits in all populations, indicating that the probability of full-sibs being produced is highest within fruits. Our results show that low population size can increase the rate of selfing in C. legalis and that open-pollinated seed from the largest populations may also include inbreeding from mating among relatives. Keywords: Brazilian Atlantic Forest, conservation genetics, microsatellite markers, population genetics, tropical tree species Nous avons etudie l'impact de la taille de la population sur la diversite genetique, la consanguinite et systeme d'accouplement dans petit reste des peuplements de l'arbre neotropicale, Cariniana legalis, en utilisant loci microsatellites. Tous les arbres adultes dans les trois peuplements de taille differente (4, 22 et 65 arbres) ont ete echantillonnes, ainsi que des semences a pollinisation libre. Un certain nombre d'impacts lies a la taille de la population etaient evidents. richesse allelique etait significativement plus faible chez les descendants dans le plus petit fragment, de meme que le taux outcrossing. taux arbre allogamie individuels etaient majoritairement eleves, mais plusieurs arbres ont presente l'accouplement significative parmi les parents. La correlation de la paternite dans les fruits etait significativement plus eleve que chez les fruits dans toutes les populations, ce qui indique que la probabilite de la pleine sibs etant produites est le plus eleve dans les fruits. Nos resultats montrent que la faible taille de la population peut augmenter le taux d'autofecondation en C. legalis et que les semences a pollinisation libre des plus grandes populations peuvent egalement inclure l'endogamie de l'accouplement chez les parents. Se investigo el impacto del tamano de la poblacion sobre la diversidad genetica, la endogamia y el sistema de