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Genotyping-by-sequencing of pear (Pyrus spp.) accessions unravels novel patterns of genetic diversity and selection footprints

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Horticulture Research 2017年第1期4卷 301-310页

作者： Satish Kumar Chris Kirk Cecilia Deng Claudia Wiedow Mareike Knaebel lester brewer The New Zealand Institute for Plant&Food Research Limited Hawke’s Bay Research CentreHavelock NorthNew Zealand Palmerston North Research Centre Palmerston NorthNew Zealand Mount Albert Research Centre AucklandNew Zealand Motueka Research Centre MotuekaNew Zealand

Understanding of genetic diversity and marker-trait relationships in pears(Pyrus spp.)forms an important part of gene conservation and cultivar *** of Asian and European pear species,and interspecific hybrids were planted in a common garden ***-by-sequencing(GBS)was used to genotype 214 accessions,which were also phenotyped for fruit quality traits.A combination of selection scans and association analyses were used to identify signatures of *** of genetic diversity,population structure and introgression were also *** 15000 high-quality SNP markers were identified from the GBS data,of which 25%and 11%harboured private alleles for European and Asian species,*** clustering analysis suggested negligible gene flow,resulting in highly significant population differentiation(Fst=0.45)between Asian and European *** hybrids displayed an average of 55%and 45%introgression from their Asian and European ancestors,***(firmness,acidity,shape and so on)variation between accessions was significantly associated with genetic *** frequencies at large-effect SNP loci were significantly different between genetic groups,suggesting footprints of directional *** scan analyses identified over 20 outlier SNP loci with substantial statistical support,likely to be subject to directional selection or closely linked to loci under selection.

关键词： planted directional likely

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Fine-mapping and validation of the genomic region underpinning pear red skin colour

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Horticulture Research 2019年第1期6卷 1607-1613页

作者： Satish Kumar Chris Kirk Cecilia Hong Deng Claudia Wiedow Mengfan Qin Richard Espley Jun Wu lester brewer The New Zealand Institute for Plant and Food Research Limited Hawkes Bay Research CentreHavelock NorthNew Zealand The New Zealand Institute for Plant and Food Research Limited Palmerston North Research CentrePalmerston NorthNew Zealand The New Zealand Institute for Plant and Food Research Limited Mount Albert Research CentreAucklandNew Zealand Centre of Pear Engineering Technology Research Nanjing Agricultural University210095 NanjingChina The New Zealand Institute for Plant and Food Research Limited Motueka Research CentreMotuekaNew Zealand

Red skin colour is an important target trait in various pear breeding *** this study,the genetic control of red skin colour was investigated in an interspecific population derived using the descendants of the red sport European pear cultivar‘Max Red Bartlett’(MRB)and the red-blushed Chinese pear cultivar‘Huobali’.Approximately 550 seedlings from nine families were phenotyped for red skin over-colour coverage(Ocolcov)and the intensity of red over-colour(Ocolint)on a 0–9 scale,and genotyped using ***-wide association analyses were conducted using 7500 high-quality single nucleotide polymorphisms(SNPs).Genomic regions on linkage groups(LG)4 and 5 were found to be associated,and the best SNP(S578_25116)on LG4 accounted for~15%of phenotypic variation in Ocolcov and *** association of S578_25116 with Ocolcov and Ocolint was successfully validated in a sample of~200 European and Asian pear *** association with red skin at locus S578_25116 was not present in Asian pear accessions,suggesting its close proximity to the MRB’s Cardinal *** putative candidate genes,including MYB transcription factors(PCP027962 and PCP027967),were identified in the quantitative trait locus region on LG4 and await functional validation.

关键词： cultivar breeding colour

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Genome mapping of postzygotic hybrid necrosis in an interspecific pear population

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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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