Genetic mapping of sex and self-incompatibility determinants in the androdioecious plant Phillyrea angustifolia

10.24072/pcjournal.23 - Peer Community Journal, Volume 1 (2021), article no. e15.

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The diversity of mating and sexual systems in angiosperms is spectacular, but the factors driving their evolution remain poorly understood. In plants of the Oleaceae family, an unusual self-incompatibility (SI) system has been discovered recently, whereby only two distinct homomorphic SI specificities segregate stably. To understand the role of this peculiar SI system in preventing or promoting the diversity of sexual phenotypes observed across the family, an essential first step is to characterize the genetic architecture of these two traits. Here, we developed a high-density genetic map of the androdioecious shrub P. angustifolia based on a F1 cross between a hermaphrodite and a male parent with distinct SI genotypes. Using a double restriction-site associated digestion (ddRAD) sequencing approach, we obtained reliable genotypes for 196 offspring and their two parents at 10,388 markers. The resulting map comprises 23 linkage groups totaling 1,855.13 cM on the sex-averaged map. We found strong signals of association for the sex and SI phenotypes, that were each associated with a unique set of markers on linkage group 12 and 18 respectively, demonstrating inheritance of these traits as single, independent, mendelian factors. The P. angustifolia linkage map shows robust synteny to the olive tree genome overall. Two of the six markers strictly associated with SI in P. angustifolia have strong similarity with a recently identified 741kb chromosomal region fully linked to the SI phenotype on chromosome 18 of the olive tree genome, providing strong cross-validation support. The SI locus stands out as being markedly rearranged, while the sex locus has remained relatively more collinear between the two species. This P. angustifolia linkage map will be a useful resource to investigate the various ways by which the sex and SI determination systems have co-evolved in the broader phylogenetic context of the Oleaceae family.

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DOI: 10.24072/pcjournal.23
Carré, Amélie 1; Gallina, Sophie 1; Santoni, Sylvain 2; Vernet, Philippe 1; Godé, Cécile 1; Castric, Vincent 1; Saumitou-Laprade, Pierre 1

1 CNRS, Univ. Lille, UMR 8198 – Evo-Eco-Paleo, F-59000 Lille, France
2 UMR DIAPC - Diversité et adaptation des plantes cultivées - Montpellier, France
     author = {Carr\'e, Am\'elie and Gallina, Sophie and Santoni, Sylvain and Vernet, Philippe and God\'e, C\'ecile and Castric, Vincent and Saumitou-Laprade, Pierre},
     title = {Genetic mapping of sex and self-incompatibility determinants in the androdioecious plant {<i>Phillyrea} angustifolia</i>},
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Carré, Amélie; Gallina, Sophie; Santoni, Sylvain; Vernet, Philippe; Godé, Cécile; Castric, Vincent; Saumitou-Laprade, Pierre. Genetic mapping of sex and self-incompatibility determinants in the androdioecious plant Phillyrea angustifolia. Peer Community Journal, Volume 1 (2021), article  no. e15. doi : 10.24072/pcjournal.23.

Peer reviewed and recommended by PCI : 10.24072/pci.genomics.100011

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