The effects of inbreeding, genetic dissimilarity and phenotype on male reproductive success in a dioecious plant

Author:

Austerlitz Frédéric1,Gleiser Gabriela23,Teixeira Sara45,Bernasconi Giorgina256

Affiliation:

1. Laboratoire Ecologie, Systématique et Evolution, UMR CNRS 8079, Université Paris-Sud, 91405 Orsay Cedex, France

2. Institute of Biology, Evolutionary Botany, University of Neuchâtel, Rue Emile Argand 11, CH 2000 Neuchâtel, Switzerland

3. Laboratorio Ecotono, INIBIOMA, Universidad del Comahue, CONICET, 8400 Bariloche, Argentina

4. CCMAR, Grupo MAREE, Universidade do Algarve, 8005-139 Faro, Portugal

5. Institute of Environmental Sciences, University of Zurich, CH 8057 Zurich, Switzerland

6. Department of Ecology and Evolution, University of Lausanne, CH 1015 Lausanne, Switzerland

Abstract

Pollen fate can strongly affect the genetic structure of populations with restricted gene flow and significant inbreeding risk. We established an experimental population of inbred and outbred Silene latifolia plants to evaluate the effects of (i) inbreeding depression, (ii) phenotypic variation and (iii) relatedness between mates on male fitness under natural pollination. Paternity analysis revealed that outbred males sired significantly more offspring than inbred males. Independently of the effects of inbreeding, male fitness depended on several male traits, including a sexually dimorphic (flower number) and a gametophytic trait ( in vitro pollen germination rate). In addition, full-sib matings were less frequent than randomly expected. Thus, inbreeding, phenotype and genetic dissimilarity simultaneously affect male fitness in this animal-pollinated plant. While inbreeding depression might threaten population persistence, the deficiency of effective matings between sibs and the higher fitness of outbred males will reduce its occurrence and counter genetic erosion.

Publisher

The Royal Society

Subject

General Agricultural and Biological Sciences,General Environmental Science,General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine

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