Skip to Main content Skip to Navigation
Journal articles

Genome mapping of postzygotic hybrid necrosis in an interspecific pear population

Abstract : Deleterious epistatic interactions in plant inter- and intraspecific hybrids can cause a phenomenon known as hybrid necrosis, characterized by a typical seedling phenotype whose main distinguishing features are dwarfism, tissue necrosis and in some cases lethality. Identification of the chromosome regions associated with this type of incompatibility is important not only to increase our understanding of the evolutionary diversification that led to speciation but also for breeding purposes. Development of molecular markers linked to the lethal genes will allow breeders to avoid incompatible inbred combinations that could affect the expression of important agronomic tratis co-segregating with these genes. Although hybrid necrosis has been reported in several plant taxa, including Rosaceae species, this phenomenon has not been described previously in pear. In the interspecific pear population resulting from a cross between PEAR3 (Pyrus bretschneideri × Pyrus communis) and ‘Moonglow’ (P. communis), we observed two types of hybrid necrosis, expressed at different stages of plant development. Using a combination of previously mapped and newly developed genetic markers, we identified three chromosome regions associated with these two types of lethality, which were genetically independent. One type resulted from a negative epistatic interaction between a locus on linkage group 5 (LG5) of PEAR3 and a locus on LG1 of ‘Moonglow’, while the second type was due to a gene that maps to LG2 of PEAR3 and which either acts alone or more probably interacts with another gene of unknown location inherited from ‘Moonglow’.
Document type :
Journal articles
Complete list of metadata

Cited literature [77 references]  Display  Hide  Download
Contributor : Okina Univ Angers Connect in order to contact the contributor
Submitted on : Wednesday, May 27, 2020 - 11:05:55 PM
Last modification on : Wednesday, April 6, 2022 - 4:08:19 PM


2016_Montanari_ Horticulture R...
Publisher files allowed on an open archive




Sara Montanari, Lester Brewer, Robert Lamberts, Riccardo Velasco, Mickael Malnoy, et al.. Genome mapping of postzygotic hybrid necrosis in an interspecific pear population. Horticulture research, Nature Publishing Group, 2016, 3 (3), pp.15064. ⟨10.1038/hortres.2015.64⟩. ⟨hal-02516634⟩



Record views


Files downloads