Paternity tests support a diallelic self-incompatibility system in a wild olive (Olea europaea subsp. laperrinei , Oleaceae)

Ecology and Evolution
Guillaume BesnardDjamel Baali-Cherif

Abstract

Self-incompatibility (SI) is the main mechanism that favors outcrossing in plants. By limiting compatible matings, SI interferes in fruit production and breeding of new cultivars. In the Oleeae tribe (Oleaceae), an unusual diallelic SI system (DSI) has been proposed for three distantly related species including the olive (Olea europaea), but empirical evidence has remained controversial for this latter. The olive domestication is a complex process with multiple origins. As a consequence, the mixing of S-alleles from two distinct taxa, the possible artificial selection of self-compatible mutants and the large phenological variation of blooming may constitute obstacles for deciphering SI in olive. Here, we investigate cross-genotype compatibilities in the Saharan wild olive (O. e. subsp. laperrinei). As this taxon was geographically isolated for thousands of years, SI should not be affected by human selection. A population of 37 mature individuals maintained in a collection was investigated. Several embryos per mother were genotyped with microsatellites in order to identify compatible fathers that contributed to fertilization. While the pollination was limited by distance inside the collection, our results strongly support the DS...Continue Reading

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Citations

Apr 27, 2021·Evolutionary Applications·Roberto MariottiSoraya Mousavi

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Methods Mentioned

BETA
genotyping
PCR
electrophoresis

Software Mentioned

R package “ ade4 ”
R
vegan
ggplot2
CERVUS
Geneious

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