Am. J. Bot. Plant Physiology
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(American Journal of Botany. 2004;91:58-64.)
© 2004 Botanical Society of America, Inc.

Population Biology

Mating system and population structure of Acacia aroma and A. macracantha (Fabaceae)1

Paola Vanesa Casiva2,4, Juan César Vilardi2, Ana María Cialdella3 and Beatriz O. Saidman2

2Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina; 3Instituto de Botánica Darwinion, Labardén 200, 1642 San Isidro, Buenos Aires, Argentina

Acacia aroma and A. macracantha are closely related species that inhabit northern and central Argentina. The reproductive barriers between them seem to be weak. They exhibit low genetic differentiation, high levels of interspecific gene flow, and extensive areas of sympatry. Isoenzymatic approaches were used to evaluate the population structure and mating system parameters in natural Argentine populations of A. aroma and A. macracantha and to provide new tools for the analysis of relationships between these two species. All studied populations had high levels of genetic variability and no significant departures from Hardy-Weinberg expectations, but the two species did not differ from each other. Most variability occured within populations. Mating system analysis showed high levels of outcrossing, no biparental inbreeding, and a high probability that individuals within progeny arrays are full rather than half sibs. In all A. aroma and A. macracantha populations, polymorphic loci had the same allelic variants, and no geographic or genetic isolation between species was found. The results favor the hypothesis that these two entities represent a single polymorphic species rather than two distinct species.

Key Words: Acacia • Argentina • Fabaceae • genetic variability • isozymes • mating system parameters • population structure






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