Genome mapping of postzygotic hybrid necrosis in an interspecific pear population  

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 

机构地区：[1]Research and Innovation Centre,Fondazione Edmund Mach,Via Mach 1,San Michele all’Adige,38010,TN,Italy [2]The New Zealand Institute for Plant&Food Research Limited,Palmerston North Research Centre,Palmerston North,New Zealand [3]Institut de Recherche en Horticulture et Semences-UMR1345,Institut National de la Recherche Agronomique(INRA),SFR 4207 Quasav,42 rue Georges Morel,Beaucouzé,F-49071,France [4]The New Zealand Institute for Plant&Food Research Limited,Motueka Research Centre,Motueka,New Zealand [5]Institut de Recherche en Horticulture et Semences-UMR1345,Universitéd’Angers,Angers,F-49045,France [6]The New Zealand Institute for Plant&Food Research Limited,Hawke’s Bay Research Centre,Havelock North,New Zealand

出　　处：《Horticulture Research》2016年第1期326-337,共12页园艺研究（英文）

基　　金：SM was funded by the Fondazione Edmund Mach PhD School.

摘　　要：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’.

关 键 词：breeding SEEDLING DWARF 

分 类 号：S51[农业科学—作物学]