Abstract
Pollen of acacias is transported by insects as polyads, composite pollen grains. The polyad has enough pollen grains to fertilize all ovules within a flower and hence all seed within a pod may be full sibs. Isozyme markers were used to test this hypothesis in two populations of Acacia melanoxylon R.Br. The proportions of fruit pods with multiple paternity detected in two populations were 0.08 and 0.15. The proportions of fullsib pairs within pods estimated by the sibling pair method were 1 and 0.63 for the two populations. Comparison of the diploid paternal genotypes of pods of single paternity showed that the probability of a common pollen source for a pair of pods was high within globular clusters (0.35) or within inflorescences (0.46) but declined to 0.10 or 0.25 within the tree at random. Thus the reproductive system acted to reinforce a hierarchy of paternal correlation within each tree.
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Selected References
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- Chakraborty R., Meagher T. R., Smouse P. E. Parentage analysis with genetic markers in natural populations. I. The expected proportion of offspring with unambiguous paternity. Genetics. 1988 Mar;118(3):527–536. doi: 10.1093/genetics/118.3.527. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Schoen D. J., Clegg M. T. Estimation of mating system parameters when outcrossing events are correlated. Proc Natl Acad Sci U S A. 1984 Aug;81(16):5258–5262. doi: 10.1073/pnas.81.16.5258. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Schoen D. J., Clegg M. T. Monte carlo studies of plant mating system estimation models: the one-pollen parent and mixed mating models. Genetics. 1986 Apr;112(4):927–945. doi: 10.1093/genetics/112.4.927. [DOI] [PMC free article] [PubMed] [Google Scholar]