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High prevalence of multiple paternity within fruits in natural populations of Silene latifolia, as revealed by microsatellite DNA analysis


Teixeira, S; Bernasconi, G (2007). High prevalence of multiple paternity within fruits in natural populations of Silene latifolia, as revealed by microsatellite DNA analysis. Molecular Ecology, 16(20):4370-4379.

Abstract

Data on multiple paternity within broods has been gathered in several animal species, and
comparable data in plants would be of great importance to understand the evolution of
reproductive traits in a common framework. In this study, we first isolated and characterized six microsatellite loci from the dioecious plant Silene latifolia (Caryophyllaceae). The polymorphism of the loci was assessed in 60 individual females from four different populations.
Two of the investigated loci showed a pattern of inheritance consistent with X-linkage.
These microsatellite loci were highly polymorphic and therefore useful tools for parentage analysis. We then used four of the markers to determine paternity within naturally pollinated fruits in four European populations. This study revealed widespread multiple paternity in all populations investigated. The minimum number of fathers per fruit varied from one to nine, with population means ranging from 3.4 to 4.9. The number of fathers per fruit was not significantly correlated with offspring sex ratios. High prevalence of multiple paternity within fruits strongly suggest that pollen competition is likely to occur in this species. This may substantially impact male reproductive success and possibly contribute to increase female and offspring fitness, either through postpollination selection
or increased genetic diversity. Wide variation in outcrossing rates may be an overlooked aspect of plant mating systems.

Abstract

Data on multiple paternity within broods has been gathered in several animal species, and
comparable data in plants would be of great importance to understand the evolution of
reproductive traits in a common framework. In this study, we first isolated and characterized six microsatellite loci from the dioecious plant Silene latifolia (Caryophyllaceae). The polymorphism of the loci was assessed in 60 individual females from four different populations.
Two of the investigated loci showed a pattern of inheritance consistent with X-linkage.
These microsatellite loci were highly polymorphic and therefore useful tools for parentage analysis. We then used four of the markers to determine paternity within naturally pollinated fruits in four European populations. This study revealed widespread multiple paternity in all populations investigated. The minimum number of fathers per fruit varied from one to nine, with population means ranging from 3.4 to 4.9. The number of fathers per fruit was not significantly correlated with offspring sex ratios. High prevalence of multiple paternity within fruits strongly suggest that pollen competition is likely to occur in this species. This may substantially impact male reproductive success and possibly contribute to increase female and offspring fitness, either through postpollination selection
or increased genetic diversity. Wide variation in outcrossing rates may be an overlooked aspect of plant mating systems.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Uncontrolled Keywords:autosomal and X-linked microsatellites, male reproductive success, pollen competition, Silene alba
Language:English
Date:2007
Deposited On:11 Feb 2008 12:27
Last Modified:06 Dec 2017 13:40
Publisher:Wiley-Blackwell
ISSN:0962-1083
Additional Information:The definitive version is available at www.blackwell-synergy.com.
Publisher DOI:https://doi.org/10.1111/j.1365-294X.2007.03493.x

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