A study of the mating system in Dolichandra cynanchoides (Bignoniaceae): an Argentinian Chaco woodlands liane with a late-acting self-incompatibility |
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| Authors: | M. B. Bianchi S. A. Harris P. E. Gibbs D. E. Prado |
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| Affiliation: | (1) Cátedra de Botánica, Facultad de Ciencias Agrarias – UNR, , C. C. N° 14, S2125, ZAA, Zavalla, Argentina;(2) Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, Great Britain;(3) School of Biology, The University, St Andrews, KY16 9AL, Great Britain |
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| Abstract: | We estimated the outcrossing rate in a population of 14 individuals of Dolichandra cynanchoides (Bignoniaceae), a species with late-acting self-incompatibility (LSI), at a site in Chaco woodland in Santa Fe province, Argentina. A subsample of five arbitrarily chosen loci from a total of 16 allozyme loci gave mating system parameters of tm=0.881 (SD 0.039) and ts=0.749 (SD 0.048), thus indicating that although predominantly outcrossing, D. cynanchoides has a mixed mating system. We draw attention to the fact that mixed mating in species with LSI is a very likely scenario, given that previous studies with diverse LSI taxa have shown that mixed cross-self pollen loads on the stigma, which is probably a common occurrence with natural pollinators, result in fruits with a proportion of selfed seeds. |
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| Keywords: | Bignoniaceae Dolichandra cynanchoides mating system late-acting self-incompatibility mixed mating |
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