Abstract
In natural populations where interfertile species coexist, conspecific and heterospecific pollen can be delivered to the stigmas. Post-pollination mechanisms might determine the seed siring success of different pollen donors within species as well as the chances for hybridization between species. Nicotiana longiflora and N. plumbaginifolia occur in sympatry in Northwest Argentina, where they have overlapping flowering seasons and share floral visitors. We explored (1) pollen tube growth rates for outcross versus self pollen in single-donor pollinations; (2) siring success of self versus outcross pollen donors in competitive pollinations, and (3) possibilities for hybridization by performing two- (outcross conspecific vs. heterospecific) and three-pollen donor (self vs. outcross vs. heterospecific) crosses. In N. longiflora, both pollen tube growth rate and siring success favored outcross pollen over self pollen and strong rejection of heterospecific pollen. In N. plumbaginifolia, pollen tube growth rate was similar for self and outcross pollen, self pollen sired similar numbers of offspring than outcross pollen and heterospecific pollen sired roughly the same number of progeny than self pollen. Results suggest that in natural sympatric populations, interspecific crosses would likely lead to unidirectional hybridization with N. plumbaginifolia as the seed parent.
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Acknowledgments
The Electron Microscopy Core facility at University of Missouri provided the UV microscope to visualize pollen tubes. C. Galen provided the Elzone particle counter and a micrometer ocular to determine pollen size. J. Murfett provided DNA extraction and PCR protocols. J. Copa, F. Benicio, R. Guanuco, and L. Cejas helped locate the populations and collect the seeds used in this study. Two anonymous reviewers made very helpful comments that greatly improved this manuscript. The government of Argentina provided collection and exportation permits of seeds used for crosses in this study. C. B. Lee helped to set up the protocol for pollen tube growth rates. DMF-C was supported with a fellowship (#130046) provided by CONACyT.
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Communicated by Andrew Stephenson.
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Figueroa-Castro, D.M., Holtsford, T.P. Post-pollination mechanisms in Nicotiana longiflora and N. plumbaginifolia: pollen tube growth rate, offspring paternity and hybridization. Sex Plant Reprod 22, 187–196 (2009). https://doi.org/10.1007/s00497-009-0103-6
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DOI: https://doi.org/10.1007/s00497-009-0103-6