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Comparison of mating system parameters and genetic structure in three natural scenarios of Acacia visco (Leguminosae, Mimosoideae)

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Abstract

Acacia visco is a native South American tree species that has been extensively used for ornamental purposes and in carpentry, bodywork and parquet due to the hardness and durability of its wood. Little is known about genetic diversity and mating system of A. visco. The main aims of this study were to (1) estimate outcrossing rates in natural Argentinean populations using AFLP markers, (2) test for any difference in mating patterns among a large a patchy and relict population, and (3) compare the mating system of A. visco with other Acacia species. The three primer pairs used in the AFLP analysis revealed a total of 569 variable loci. Most genetic variation was observed among individuals within families (61.2 %). The estimate of multilocus outcrossing rate (t m) was high (≥0.971) in all populations. Average pairwise coancestry between progenies within families for each population ranged from 0.082 to 0.105 or from 0.125 to 0.136, depending on the method θ was estimated. In the three populations studied, the progenies of open pollination were constituted mainly for half-sibs (94.3 %). This work shows a similar mating system in all populations of A. visco in spite of their size differences, hypothesizing that the entire species has a similar mating system of outcrossing preferential. Considering the results obtained here where a high percentage of individuals were half-sibs, sampling large numbers of pods from individual trees for ex situ conservation will result in a genetically diverse sample as a consequence of high outcrossing rates.

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Acknowledgments

The authors of this work want to thank Dr. Ana María Cialdella of Instituto de Botánica Darwinion, who kindly determined the material studied here. This work was supported by the Universidad de Buenos Aires (EX20020100100008 to B. O.S.) and the Consejo Nacional de Investigaciones Científicas y Técnicas (PIP 11220090100147 to J. C. V.). A special thanks to the Lic. Ariel Guionet from the SERVICIO DE SECUENCIACIÓN Y GENOTIPIFICADO from Departamento de Ecología Genética y Evolución, FCEyN, UBA.

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  1. Departamento de Ecología, Genética y Evolución, Pabellón 2, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428, Buenos Aires, Argentina

    Carolina L. Pometti, Cecilia F. Bessega, Juan C. Vilardi & Beatriz O. Saidman

  2. Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina

    Carolina L. Pometti, Cecilia F. Bessega, Juan C. Vilardi & Beatriz O. Saidman

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  1. Carolina L. Pometti
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  2. Cecilia F. Bessega
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Correspondence to Carolina L. Pometti.

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Pometti, C.L., Bessega, C.F., Vilardi, J.C. et al. Comparison of mating system parameters and genetic structure in three natural scenarios of Acacia visco (Leguminosae, Mimosoideae). Plant Syst Evol 299, 761–771 (2013). https://doi.org/10.1007/s00606-013-0759-0

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