title: Using the Animal Model to Accelerate Response to Selection in a Self-Pollinating Crop.
abstract: We used the animal model in S0 (F1) recurrent selection in a self-pollinating crop including, for the first time, phenotypic and relationship records from self progeny, in addition to cross progeny, in the pedigree. We tested the model in Pisum sativum, the autogamous annual species used by Mendel to demonstrate the particulate nature of inheritance. Resistance to ascochyta blight (Didymella pinodes complex) in segregating S0 cross progeny was assessed by best linear unbiased prediction over two cycles of selection. Genotypic concurrence across cycles was provided by pure-line ancestors. From cycle 1, 102/959 S0 plants were selected, and their S1 self progeny were intercrossed and selfed to produce 430 S0 and 575 S2 individuals that were evaluated in cycle 2. The analysis was improved by including all genetic relationships (with crossing and selfing in the pedigree), additive and nonadditive genetic covariances between cycles, fixed effects (cycles and spatial linear trends), and other random effects. Narrow-sense heritability for ascochyta blight resistance was 0.305 and 0.352 in cycles 1 and 2, respectively, calculated from variance components in the full model. The fitted correlation of predicted breeding values across cycles was 0.82. Average accuracy of predicted breeding values was 0.851 for S2 progeny of S1 parent plants and 0.805 for S0 progeny tested in cycle 2, and 0.878 for S1 parent plants for which no records were available. The forecasted response to selection was 11.2% in the next cycle with 20% S0 selection proportion. This is the first application of the animal model to cyclic selection in heterozygous populations of selfing plants. The method can be used in genomic selection, and for traits measured on S0-derived bulks such as grain yield.
authors.affiliation: The UWA Institute of Agriculture, The University of Western Australia, Crawley, Western Australia 6009, Australia wallace.cowling@uwa.edu.au.
authors.forename: Wallace A
authors.identifier: http://orcid.org/0000-0002-3101-7695
authors.initials: WA
authors.lastname: Cowling
authors.affiliation: The UWA Institute of Agriculture, The University of Western Australia, Crawley, Western Australia 6009, Australia.
authors.forename: Katia T
authors.initials: KT
authors.lastname: Stefanova
authors.affiliation: The UWA Institute of Agriculture, The University of Western Australia, Crawley, Western Australia 6009, Australia.
authors.forename: Cameron P
authors.initials: CP
authors.lastname: Beeck
authors.affiliation: The UWA Institute of Agriculture, The University of Western Australia, Crawley, Western Australia 6009, Australia School of Plant Biology, The University of Western Australia, Crawley, Western Australia 6009, Australia.
authors.forename: Matthew N
authors.initials: MN
authors.lastname: Nelson
authors.affiliation: The UWA Institute of Agriculture, The University of Western Australia, Crawley, Western Australia 6009, Australia School of Plant Biology, The University of Western Australia, Crawley, Western Australia 6009, Australia.
authors.forename: Bonnie L W
authors.initials: BL
authors.lastname: Hargreaves
authors.affiliation: Norddeutsche Pflanzenzucht Hans-Georg Lembke KG, Hohenlieth, 24363 Holtsee, Germany.
authors.forename: Olaf
authors.initials: O
authors.lastname: Sass
authors.affiliation: Cargo Vale, Cargo, New South Wales 2800, Australia.
authors.forename: Arthur R
authors.initials: AR
authors.lastname: Gilmour
authors.affiliation: The UWA Institute of Agriculture, The University of Western Australia, Crawley, Western Australia 6009, Australia.
authors.forename: Kadambot H M
authors.initials: KH
authors.lastname: Siddique
mesh_terms: D001947:Breeding; D060467:Disease Resistance / Q000235:genetics; D005838:Genotype; D008957:Models, Genetic; D018532:Pisum sativum / Q000235:genetics*; D010375:Pedigree; D010641:Phenotype; D010935:Plant Diseases / Q000235:genetics / Q000382:microbiology; D054817:Pollination / Q000235:genetics*; D004718:Saccharomycetales / Q000502:physiology; D012641:Selection, Genetic
keywords: BLUP selection; GenPred; animal model; autogamous plants; black spot disease; field peas; genomic selection; pedigree selection; shared data resource