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Mating system parameters and genetic structure in Argentinean populations of Acacia caven (Leguminosae, Mimosoideae)

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Abstract

Acacia caven (Mol.) Mol. is native to South America. The species is a leguminous, woody small tree that is considered to have certain potential as a managed silvopastoral crop. Six varieties have been described for the species based on both morphological traits and molecular markers. Little information is available on its mating system. The main objectives of this work were to test the hypothesis that A. caven is an outcrosser and to estimate parameters of its mating system and population structure on the basis of isozyme markers. In the four populations studied, a high homozygote excess was found in the progeny population but not in the mother plant genotypes. The estimate for the multi-locus outcrossing rate (tm) was high (≥0.957) in all populations, indicating that Acacia caven is a predominantly outcrosser species. The results of genetic structure analysis within each population indicated that differences in allelic frequencies among families in all of the populations studied are highly significant. The difference in F estimates between progeny and mother plants suggests some selection favouring heterozygotes between the seedling and adult stages. Therefore, a strategy for ex situ conservation might emphasise sampling more populations with a relative large number of trees per site.

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Acknowledgments

This study was supported by Agencia Nacional de Promoción Científica y Técnica (PICT 32064 to B.O.S.), the University of Buenos Aires (X321 to B.O.S.) and Consejo Nacional de Investigaciones Científicas y Técnicas (PIP 5122 to J.C.V.). C.P. received a fellowship from Consejo Nacional de Investigaciones Científicas y Técnicas. The authors want to thank to Dra. Ana M. Cialdella, from Instituto Darwinion, who determined the material studied.

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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, Juan C. Vilardi & Beatriz O. Saidman

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  1. Carolina L. Pometti
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  2. Juan C. Vilardi
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  3. Beatriz O. Saidman
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Correspondence to Carolina L. Pometti.

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Pometti, C.L., Vilardi, J.C. & Saidman, B.O. Mating system parameters and genetic structure in Argentinean populations of Acacia caven (Leguminosae, Mimosoideae). Plant Syst Evol 292, 25–32 (2011). https://doi.org/10.1007/s00606-010-0389-8

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