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Genome mapping of postzygotic hybrid necrosis in an interspecific pear population

Horticulture Research 2016年第1期3卷 326-337页

作者： Sara Montanari Lester Brewer robert lamberts Riccardo Velasco Mickael Malnoy Laure Perchepied Philippe Guérif Charles-Eric Durel Vincent G M Bus Susan E Gardiner David Chagné Research and Innovation Centre Fondazione Edmund MachVia Mach 1San Michele all’Adige38010TNItaly The New Zealand Institute for Plant&Food Research Limited Palmerston North Research CentrePalmerston NorthNew Zealand Institut de Recherche en Horticulture et Semences-UMR1345 Institut National de la Recherche Agronomique(INRA)SFR 4207 Quasav42 rue Georges MorelBeaucouzéF-49071France The New Zealand Institute for Plant&Food Research Limited Motueka Research CentreMotuekaNew Zealand Institut de Recherche en Horticulture et Semences-UMR1345 Universitéd’AngersAngersF-49045France The New Zealand Institute for Plant&Food Research Limited Hawke’s Bay Research CentreHavelock NorthNew Zealand

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 *** 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 *** 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 *** hybrid necrosis has been reported in several plant taxa,including Rosaceae species,this phenomenon has not been described previously in *** the interspecific pear population resulting from a cross between PEAR3(Pyrus bretschneideri×Pyrus communis)and‘Moonglow’(***),we observed two types of hybrid necrosis,expressed at different stages of plant *** 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 *** 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’.

关键词： breeding seedling dwarf

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