Genome mapping of postzygotic hybrid necrosis in an interspecific pear population

Horticulture Research
Sara MontanariDavid Chagné

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 ...Continue Reading

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Citations

Jan 29, 2017·DNA Research : an International Journal for Rapid Publication of Reports on Genes and Genomes·Leiting LiJun Wu
Sep 25, 2020·The New Phytologist·Wei-Lin WanEunyoung Chae

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Methods Mentioned

BETA
PCR
PCRs
genotyping
electrophoresis

Software Mentioned

Adobe Lightroom5
JoinMap
ImageJ
Primer3
BLASTn

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