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Phased,chromosome-scale genome assemblies of tetraploid potato reveal a complex genome,transcriptome,and predicted proteome landscape underpinning genetic diversity

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Molecular Plant 2022年第3期15卷 520-536页

作者： Genevieve Hoopes Xiaoxi Meng John P.Hamilton Sai Reddy Achakkagari Fernanda de Alves Freitas Guesdes Marie E.Bolger Joseph J.Coombs Danny Esselink Natalie R.Kaiser Linda Kodde Maria Kyriakidou Brian Lavrijssen Natascha van Lieshout Rachel Shereda Heather K.Tuttle Brieanne Vaillancourt Joshua C.Wood Jan Mde Boer Nolan Bornowski Peter Bourke David Douches herman jvan eck Dave Ellis Max J.Feldman Kyle M.Gardner Johannes C.P.Hopman Jiming Jiang Walter S.De Jong Joseph C.Kuhl Richard G.Novy Stan Oome Vidyasagar Sathuvalli Ek Han Tan Remco A.Ursum M.Isabel Vales Kelly Vining Richard G.F.Visser Jack Vossen G.Craig Yencho Noelle L.Anglin Christian W.B.Bachem Jeffrey B.Endelman Laura M.Shannon Martina V.Stromvik Helen H.Tai Bjorn Usadel C.Robin Buell Richard Finkers Department of Plant Biology Michigan State UniversityEast LansingMI 48824USA Department of Horticultural Science University of MinnesotaSt.PaulMN 55108USA Department of Plant Science McGill UniversitySainte-Anne-de-BellevueQC H9X 3V9Canada Plant Breeding Wageningen University&ResearchPlant Breeding6708 PB Wageningenthe Netherlands IBG-4 Bioinformatics Forschungszentrum JülichWilhelm Johnen Str52428 JülichGermany Department of Plant Soiland Microbial SciencesMichigan State UniversityEast LansingMI 48824USA Bayer Crop Science WoodlandCA 95695USA Averis Seeds B.V. 9640 AA Veendamthe Netherlands International Potato Center 1895 Avenida La MolinaLimaPeru USDA-ARS ProsserWA 99350USA Agriculture and Agri-Food Canada Fredericton Research and Development Centre FrederictonNB E3B 4Z7Canada School of Integrative Plant Science Cornell UniversityIthacaNY 14853-1901USA Department of Plant Sciences University of IdahoMoscowID 83844USA USDA-ARS Small Grains and Potato Germplasm ResearchAberdeenID 83210USA HZPC Research B.V. Edisonweg 58501 XG Jourethe Netherlands Department of Crop and Soil Science Oregon State UniversityHermistonOR 97838USA School of Biology and Ecology University of Maine5735 Hitchner Hall OronoME 04469USA Department of Horticultural Sciences Texas A&M UniversityCollege StationTX 77843-2133USA Department of Horticulture Oregon State UniversityCorvallisOR 97331USA Department of Horticultural Science North Carolina State UniversityRaleighNC 27695-7609USA Department of Horticulture University of Wisconsin-MadisonMadisonWI 53706USA Department of Horticulture Michigan State UniversityEast LansingMI 48824USA Institute for Biological Data Science Heinrich Heine UniversityDusseldorf40225 DusseldorfGermany Plant Resilience Institute Michigan State UniversityEast LansingMI 48824USA Present address:GenNovation B.V. Wageningenthe Netherlands

Cultivated potato is a clonally propagated autotetraploid species with a highly heterogeneous *** assemblies of six cultivars including two chromosome-scale phased genome assemblies revealed extensive allelic diversity,including altered coding and transcript sequences,preferential allele expression,and structural variation that collectively result in a highly complex transcriptome and predicted proteome,which are distributed across the homologous *** species contribute to the extensive allelic diversity in tetraploid cultivars,demonstrating ancestral introgressions predating modern breeding *** a clonally propagated autotetraploid that undergoes limited meiosis,dysfunctional and deleterious alleles are not purged in tetraploid *** a quarter of the loci bore mutations are predicted to have a high negative impact on protein function,complicating breeder’s efforts to reduce genetic *** StCDF1 locus controls maturity,and analysis of six tetraploid genomes revealed that 12 allelic variants of StCDF1 are correlated with maturity in a dosage-dependent *** of the complexity of the tetraploid potato genome with its rampant structural variation and embedded deleterious and dysfunctional alleles will be key not only to implementing precision breeding of tetraploid cultivars but also to the construction of homozygous,diploid potato germplasm containing favorable alleles to capitalize on heterosis in F1 hybrids.

关键词： potato allele diversity phased assembly polyploid pan-genome wild introgressions

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Understanding Genetic Load in Potato for Hybrid Diploid Breeding

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Molecular Plant 2019年第7期12卷 896-898页

作者： Christian W.B.Bachem herman J.van eck Michiel E.de Vries Plant Breeding Wageningen University and Research Wageningen the Netherlands Solynta Wageningen the Netherlands

Recently, Zhang et al.(2019) have managed to provide abundant evidence to support long-held theories regarding mechanisms of inbreeding depression and potential effects of heterosis that are likely to have a considerable impact on potato breeding in the future (Figure 1). Despite its large genetic variation regarding yield, harvest index, and water use efficiency, potato breeding has attained only negligible advances in the most important breeding goals such as yield, tuber quality, and abiotic stress tolerance, and only modest progress in pathogen resistance. This low level of improvement is clearly due to the complexity of breeding a heterozygous tetraploid outbreeder rather than to the lack of genetic potential available in wild and cultivated material. In contrast, breeding at the diploid level, in particular in combination with self-compatibility, will allow the fixation of beneficial alleles to homozygosity.

关键词： Genetic Load Potato Hybrid Diploid Breeding

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