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Turbocharging introgression breeding of perennial fruit crops:a case study on apple

Horticulture Research 2020年第1期7卷 2040-2046页

作者： Satish Kumar Elena Hilario Cecilia HDeng claire molloy 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 Mount Albert Research CentreAucklandNew Zealand

The allelic diversity of primitive germplasm of fruit crops provides a useful resource for introgressing novel genes to meet consumer preferences and environmental ***-breeding facilitates the identification of novel genetic variation in the primitive germplasm and expedite its utilisation in cultivar breeding *** generations of pre-breeding could be required to minimise linkage drag from the donor parent and to maximise the genomic content of the recipient *** this study we investigated the potential of genomic selection(GS)as a tool for rapid background selection of parents for the successive generation.A diverse set of 274 accessions was genotyped using random-tag genotyping-by-sequencing,and phenotyped for eight fruit quality *** relationship between‘own phenotypes’of 274 accessions and their general combining ability(GCA)was also *** heritability influenced the strength of correspondence between own phenotype and the *** average(across eight traits)accuracy of predicting own phenotype was 0.70,and the correlations between genomic-predicted own phenotype and GCA were similar to the observed *** results suggest that genome-assisted parental selection(GAPS)is a credible alternative to phenotypic parental selection,so could help reduce the generation interval to allow faster accumulation of favourable alleles from donor and recipient parents.

关键词： breeding crops donor

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Extreme-phenotype GWAS unravels a complex nexus between apple(Malus domestica)red-flesh colour and internal flesh browning

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Fruit Research 2022年第1期2卷 110-123页

作者： Satish Kumar Cecilia H.Deng claire molloy Chris Kirk Blue Plunkett Kui Lin-Wang Andrew Allan Richard Espley The New Zealand Institute for Plant and Food Research Limited Hawke's Bay Research CentreHavelock North 4130New Zealand The New Zealand Institute for Plant and Food Research Limited Mount Albert Research CentreAuckland 1025New Zealand The New Zealand Institute for Plant and Food Research Limited Palmerston North Research CentrePalmerston North 4410New Zealand

The genetic link between apple red flesh(RF)coloration and the internal flesh browning disorder(FBD)is a major challenge when breeding high fruit quality RF apple cultivars.A genome-wide association study(GWAS)was conducted in a population of about 900 red-leaved seedlings to identify genomic regions and putative candidate genes using whole genome sequencing of the pools of extreme phenotypes(XP)for the RF colour coverage(using the weighted cortex index(WCI))and *** study identified novel genomic regions contributing to WCI and FBD variation in the red-leaved *** FBD-associated regions were enriched for genes regulating senescence,heat shock proteins,cytochrome P450,ascorbate metabolism and pectin methyl *** there were no significant regions in common for WCI and FBD,there were several genes(***85,MYB66,ethylene insensitive 3,DNAJ heat shock protein,WRKY7,and NAC42)enriched commonly between the genomic regions associated with these traits,potentially underpinning the genetic connection between WCI and *** of the differentially expressed genes between the R6:MdMYB10 and white-fleshed‘control’apples resided within the GWAS hotspot for WCI(*** synthase,UDP-Glycosyl transferase)and FBD(*** GTPase activating protein,lipoxygenase 1,phytoene synthase)–validating the XP-GWAS *** of several genes resided in the trait-associated genomic regions,suggesting that whole genome duplication plays an important role in the regulation of these *** genetic correlations between WCI and sensory traits were observed,and strategies to develop FBD-free high fruit quality RF cultivars are discussed.

关键词： cultivar breeding GWAS

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