Relative strength of fine-scale spatial genetic structure in paternally vs biparentally inherited DNA in a dioecious plant depends on both sex proportions and pollen-to-seed dispersal ratio

In plants, the spatial genetic structure (SGS) is shaped mainly by gene dispersal and effective population density. Among additional factors, the mode of DNA inheritance and dioecy influence SGS. However, their joint impact on SGS remains unclear, especially in the case of paternally inherited DNA....

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Bibliographic Details
Published in:Heredity 2016-12, Vol.117 (6), p.449-459
Main Authors: Chybicki, I J, Dering, M, Iszkuło, G, Meyza, K, Suszka, J
Format: Article
Language:English
Subjects:
Cell Nucleus - genetics
Computer Simulation
Deoxyribonucleic acid
DNA
DNA, Mitochondrial - genetics
DNA, Plant - genetics
Flowers & plants
Genetic Markers
Genetic structure
Genetics
Genetics, Population
Inheritance Patterns
Microsatellite Repeats
Mitochondrial DNA
Models, Genetic
Natural populations
Original
Plant populations
Pollen
Pollen - genetics
Population Density
Seed Dispersal
Seeds
Spatial Analysis
Taxus - genetics
Taxus baccata
Trees - genetics
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Summary:In plants, the spatial genetic structure (SGS) is shaped mainly by gene dispersal and effective population density. Among additional factors, the mode of DNA inheritance and dioecy influence SGS. However, their joint impact on SGS remains unclear, especially in the case of paternally inherited DNA. Using theoretical approximations and computer simulations, here we showed that the relative intensity of SGS measured in paternally and biparentally inherited DNA in a dioecious plant population depends on both the proportion of males and the pollen-to-seed dispersal ratio. As long as males do not prevail in a population, SGS is more intense in paternally than biparentally inherited DNA. When males prevail, the intensity of SGS in paternally vs biparentally inherited DNA depends on the compound effect of sex proportions and the pollen-to-seed dispersal ratio. To empirically validate our predictions, we used the case of Taxus baccata, a dioecious European tree. First, we showed that mitochondrial DNA (mtDNA) in T. baccata is predominantly (98%) paternally inherited. Subsequently, using nuclear DNA (nuDNA) and mitochondrial microsatellite data, we compared the fine-scale SGS intensity at both marker types in two natural populations. The population with equal sex proportions showed stronger SGS in mtDNA than in nuDNA. On the other hand, we found lower SGS intensity in mtDNA than in nuDNA in the population with 67% males. Thus, the empirical results provided good support for the theoretical predictions, suggesting that knowledge about SGS in paternally vs biparentally inherited DNA may provide insight into effective sex proportions within dioecious populations.
ISSN:0018-067X
1365-2540
DOI:10.1038/hdy.2016.65