Self-fertility is largely decreased and even prevented by various mechanisms because, broadly, it causes inbreeding depression, although some species have retained self-reproduction regimes. Species of plants that display the self-incompatible sporophytic type of self-incompatibility may rarely self-pollinate. It is only possible in the absence of foreign compatible pollen. In the olive tree with a sporophytic mechanism, we will show that three co-dominant S-alleles R1, R3 and R5 do not lead to the same level of self-fertility. All varieties that carry R1 are less self-fertile than those that carry R5, whatever the other S-alleles, while those carrying R3 are intermediate. S-allele pair-wise combinations that differ by two or three levels of dominance, and not the other combinations allow self-fertility, and moreover each S-allele R1, R3 and R5 decreases, maintains and enhances the self-fertility rate, respectively.
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We would thanks Raymond Gimilio, Pierre Villemur, Reviewers and olive growers for their help in shaping this model. We are Indebted to Gery Bertaux for English improvements.
Conflict of interest
The Authors declare no conflict of interest.
Catherine Marie Breton and Daniela Farinelli shared equal contribution to this work.
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Breton, C.M., Farinelli, D., Koubouris, G. et al. A model based on S-allele dominance relationships to explain pseudo self-fertility of varieties in the olive tree. Euphytica 210, 105–117 (2016). https://doi.org/10.1007/s10681-016-1708-0
- Fruit setting
- Mutation in S-allele
- Olea europaea
- Sporophytic self-incompatibility