Cameron Peace, Washington State University

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Presentation transcript:

Cameron Peace, Washington State University MARKER-ASSISTED BREEDING in APPLE, PEACH, & CHERRY TARGETS VALUABLE FUNCTIONAL ALLELES Cameron Peace, Washington State University with: Nahla Bassil, Michael Coe, Gennaro Fazio, Karina Gallardo, Ksenija Gasic, Jim Luby, Dorrie Main, Jim McFerson, Cholani Weebadde, Eric van de Weg, Chengyan Yue, & Amy Iezzoni

Outline of Presentation The RosBREED Project Available “Jewels in the Genome” Jewels in Breeding Application What’s Next? RosBREED 2

The RosBREED Project

The RosBREED Project Goal: Enable MAB for U.S. Rosaceae crops PI: Amy Iezzoni, Michigan State University 4 years, Sep 2009 – Aug 2013 Funded by SCRI (USDA-NIFA’s Specialty Crop Research Initiative) $14.4 M ($7.2 M SCRI, $7.2 M in-kind Partners) Collaboration U.S.-wide and international

- discovering, polishing, using “Jewels in the Genome” - discovering, polishing, using QTL discovery (looks promising...) MAB Pipelining (polishing...) Breeding (assembling into masterpieces) Jewels = valuable genetic discoveries ready for breeding application = marker-locus-trait associations validated in a breeding program

Application of Genomics Knowledge Expression profiles Find trait-controlling genes Known QTLs Linkage maps Application in current cultivars DNA information Application Genetic/allelic diversity Application in breeding Whole genome sequences GMO

Application of Genomics Knowledge Expression profiles Find trait-controlling genes Known QTLs What DNA information is available? What is the practical goal? Various ways to get there Linkage maps Application in current cultivars DNA information Practical application Genetic/allelic diversity Application in breeding Whole genome sequences GMO

Application of Genomics Knowledge Breeding markers DNA testing services QTL priorities Crossing schemes Trial MASS Simple validation Allele effects & distributions Seedling selection schemes Known QTLs Application in breeding

Application of Genomics Knowledge Breeding markers DNA testing services QTL priorities Crossing schemes Trial MASS Simple validation Allele effects & distributions Seedling selection schemes Known QTLs Application in breeding

Application in Breeding - Requirements Tool utility = predictive power in germplasm of a breeding program Tool itself = assay (DNA markers) usable by a breeding program

Application in Breeding - Requirements Tool utility = predictive power in germplasm of a breeding program Tool itself = assay (DNA markers) usable by a breeding program ready-to-use marker-locus-trait associations DNA tests for contrasting alleles at loci for valuable traits

Application in Breeding - Requirements Tool utility = predictive power in germplasm of a breeding program Tool itself = assay (DNA markers) usable by a breeding program Idiosyncratic! One size does not fit all! ready-to-use marker-locus-trait associations DNA tests for contrasting alleles at loci for valuable traits ...all breeding-program-specific

Available “Jewels in the Genome”

Available “Jewels in the Genome” Melting vs. Non-melting flesh Freestone vs. clingstone Ever-bearing Fruit size Bitter pit susceptibility Fruit storability Self-fertility Fruit color Sunburn susceptibility “Fresh sensation” (crispness, tartness, juiciness) Sweetness & acidity Fruit size Acidity Firmness Fruit color Maturity date Red stele resistance Leaf spot resistance Fruit skin color

Strawberry: Red Stele Resistance Is presence of certain SSR allele associated with red stele resistance? Validation of marker by inoculations: - 75% match genotype-phenotype - 20% individuals have other resistance sources 0 1 2 3 4 5 3.43 disease threshold Genotypic data also used to identify many cases of incorrect parentage Marker(s)? 1 SSR Application? Parents: crossing Seedlings: culling Selections: advance

Apple: Skin Coloration Allele & Genotype frequencies in 192 cvs rf Rf rfrf RfRf Rfrf Cover amount over apple skin surface probability 1000 seedlings – how many with score >4? Rfrf x RfRf ---> 647 RfRf x RfRf ---> 818 +26% efficiency! Marker(s)? 1-3 SNPs from 8K array genome scan Application? Parents: crossing Selections: distinguish Rfrf / RfRf

Peach: Maturity Date One trait locus, two ways of genotyping Three 2-SNP haplotypes (AA,GA,AG) in four combinations Two SSR alleles (168,156) in two combinations GA:AA AA:AG 168:168 156:168 AA:AA GA:AG -40 -20 20 July +20 +40 days -40 -20 20 July +20 +40 days Marker(s)? 2 SNPs from 9K array ...or ... 1 SSR Application? Parents: crossing Seedlings: culling Selections: advance

Apple: Acidity Two loci Ma – LG16 “A” – LG8 Not quite additive – some epistasis  Use together Marker(s)? 2 SNPs from 8K array genome scan Application? Parents: crossing Selections: distinguish low/med/high

Apple: Multiple Traits Around Ma Locus “Fresh sensation” (crispness, tartness, juiciness) cM Mb 16 Fruit size Bitter pit susceptibility 5 Ma 2 10 Maturity date 15 4 Target B? L 20 25 6 30 Every individual has 2 haplotypes Honeycrisp Golden Del. Braeburn Gala Pink Lady L E Target A? L Marker(s)? 1 SSR Application? Parents: crossing Seedlings: culling Selections: advance

Cherry: G2 Fruit Size and Firmness – An Economic Trade-Off Socio-economic value ($ per lb) G2 locus haplotype G2 locus diplotype L BL AL 0.10 SE value = value of reaching threshold x probability of achieving it 0.08 CE 0.06 BE E C A AA Population average 0.04 AB B AE AD AC D 0.02 H BD AH F AF m N O Am AN BN Bm Marker(s)? SSRs – 2 flanking the QTL Application? Parents: crossing Seedlings: culling Selections: advance

Jewels in Breeding Application

Marker-Assisted Seedling Selection in the Washington Apple Breeding Program Fruit storability “Fresh sensation” (crispness, tartness, juiciness) estimated projected resource savings Cost per initial seed 2010 2011 2012 $8 $4 $0 $6 $10 $2 Savings $62K $38K $60K Rearing & evaluating those kept seedlings tested 8000 5417 7452 DNA testing seedlings culled 5000 2937 4403 Early rearing

What’s Next? RosBREED 2

A Planned New RosBREED Project CONSUMPTION MARKETING PROCESSING PRODUCTION Innovative, superior, risk-mitigating new cultivars Cultivar commercialization Post-breeding Socio-economics information Seedling selection Parent selection Efficient, accurate, creative breeding Breeding DNA information Accessible natural diversity Pre-breeding Germplasm development NATURAL DIVERSITY

Acknowledgements This project is supported by the Specialty Crop Research Initiative of USDA’s National Institute of Food and Agriculture

Questions?