Diallelic self‐incompatibility is the main determinant of fertilization patterns in olive orchards

Mariotti, Roberto; Pandolfi, Saverio; Cauwer, Isabelle De; Saumitou‐Laprade, Pierre; Vernet, Philippe; Rossi, Martina; Baglivo, Federica; Baldoni, Luciana; Mousavi, Soraya

doi:10.1111/eva.13175

Cited by 14 publications

(23 citation statements)

References 100 publications

(135 reference statements)

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“…The SI linked markers on LG18 are syntenic with the genomic interval recently identified by Mariotti et al . (2020) in the olive tree, providing strong reciprocal support that the determinants of SI are indeed located in this region.…”

Section: Discussionmentioning

confidence: 62%

“…These unanchored scaffolds provide a more complete set of genomic sequences that will be important to consider in the perspective of identifying the (currently elusive) molecular determinants of SI in these two species. We note that poor assembly of the S-locus region (MARIOTTI et al 2020) was expected given the considerable levels of structural rearrangements typically observed in SI-and more generally in the mating type-determining regions (GOUBET et al 2012;BADOUIN et al 2015), making P. angustifolia a useful resource to map the SI locus in the economically important species O. europeae.…”

Section: Discussionmentioning

confidence: 83%

“…Two of them had hits on a single region of 741,403bp on the olive tree genome. This region contains 32 annotated genes and contains two markers that were previously found to be genetically associated with SI directly in the olive tree by Mariotti et al . (2020).…”

Section: Resultsmentioning

confidence: 99%

“…Red lines correspond to markers with strong but partial (95%) association with SI. The region found to be genetically associated with SI in the olive tree by Mariotti et al . (2020) is shown by a black rectangle.…”

Section: Resultsmentioning

confidence: 99%

“…which of the males or hermaphrodites, and which of the two SI phenotypes are homozygous vs. heterozygous at either loci, or are these phenotypes under the control of hemizygous genomic regions?). Third, what is the level of synteny between our P. angustifolia genetic map and the recently published Olive tree genome (UNVER et al 2017;MARIOTTI et al 2020), both globally and specifically at the SI and sex-associated loci?…”

Section: Introductionmentioning

confidence: 99%

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

Carré

Gallina

Santoni

et al. 2021

Preprint

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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 more rearranged, while the sex locus has remained relatively more collinear. 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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Section: Discussionmentioning

confidence: 62%

Section: Discussionmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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