CASLER, M.

RESENDE, M. D. V. de

RESENDE, R. M. S.

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When:January 11 - 16, 2013Where:San Diego, CAW404Genomic Selection in Forage Breeding: Designing an Estimation PopulationDate: Saturday, January 12, 2013Time: 10:40 AMRoom: EsquireRosangela Resende , EMBRAPA, Campo Grande, MS, BrazilMichael Casler , USDA-ARS, Madison, WIMarcos D.V. Resende , Embrapa Forestry - Universidade Federal de Viçosa, Viçosa, Minas Gerais, BrazilPDF fileThe benefits of genomic selection to livestock, crops and forest tree breeding can be extended to forage grasses and legumes. The main benefitsexpected are increase selection accuracy and reducing both costs per unit of genotype evaluated and breeding cycle length. Aiming at designing atraining population, deterministic equations were used to estimate the impact of sample size (N individuals), effective population size (N ), number ofmarkers per centimorgan (L  per cM) and heritability (h ) on accuracy considering Panicum virgatum (switchgrass, genome size ~1,600 Mpb for‘Alamo’ genotypes) as a model. Simulations were based on N  = 50, 100 or 150, L  = 0.3, 3, 6, 10 and 20 markers per cM and, N = 500, 2000, 6000individuals phenotyped and genotyped, or more. Trait heritability was considered as ranging from high (0.70) to very low (0.01). The selection methodwas based on individual selection. Taking the benchmark accuracy of traditional BLUP-based phenotypic selection (r≥0.80) as a reference, accuracyfor genomic selection was similar when h  ≥ 0.4, using 20 markers per cM, Ne = 50 and 6,000 individuals.  As h  increases, fewer individuals (≤ 2000)and fewer markers (10 per cM) are needed to achieve the same accuracy. Low heritability traits (= 0.1) can require 20,000 genotyped and phenotypedindividuals, 20 markers per cM and N  = 50.  Considering the declining of genotyping costs, an expected reduction in generation time, and a potentialincrease in accuracy, genomic selection is a valuable new tool for use in forage improvement.Back to: Grasslands (Lolium Genome Initiative)<< Previous Abstract | Next Abstract >>Home/SearchBrowse by DayBrowse by TypeAuthor IndexExhibitor IndexPoster CategoriesPersonal SchedulerMeeting Informationes2e s2 2eAbstract: Genomic Selection in Forage Breeding: Designing an E... https://pag.confex.com/pag/xxi/webprogram/Paper5877.html1 de 1 28/08/2013 09:39

Genomic selection in forage breeding: designing an estimation population.

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