title: Multiple-line cross QTL mapping for biomass yield and plant height in triticale (× Triticosecale Wittmack).
abstract: QTL mapping in multiple families identifies trait-specific and pleiotropic QTL for biomass yield and plant height in triticale. Triticale shows a broad genetic variation for biomass yield which is of interest for a range of purposes, including bioenergy. Plant height is a major contributor to biomass yield and in this study, we investigated the genetic architecture underlying biomass yield and plant height by multiple-line cross QTL mapping. We employed 647 doubled haploid lines from four mapping populations that have been evaluated in four environments and genotyped with 1710 DArT markers. Twelve QTL were identified for plant height and nine for biomass yield which cross-validated explained 59.6 and 38.2 % of the genotypic variance, respectively. A major QTL for both traits was identified on chromosome 5R which likely corresponds to the dominant dwarfing gene Ddw1. In addition, we detected epistatic QTL for plant height and biomass yield which, however, contributed only little to the genetic architecture of the traits. In conclusion, our results demonstrate the potential of genomic approaches for a knowledge-based improvement of biomass yield in triticale.
authors.affiliation: State Plant Breeding Institute, University of Hohenheim, 70593, Stuttgart, Germany.
authors.forename: Katharina V
authors.initials: KV
authors.lastname: Alheit
authors.forename: Lucas
authors.initials: L
authors.lastname: Busemeyer
authors.forename: Wenxin
authors.initials: W
authors.lastname: Liu
authors.forename: Hans Peter
authors.initials: HP
authors.lastname: Maurer
authors.forename: Manje
authors.initials: M
authors.lastname: Gowda
authors.forename: Volker
authors.initials: V
authors.lastname: Hahn
authors.forename: Sigrid
authors.initials: S
authors.lastname: Weissmann
authors.forename: Arno
authors.initials: A
authors.lastname: Ruckelshausen
authors.forename: Jochen C
authors.initials: JC
authors.lastname: Reif
authors.forename: Tobias
authors.initials: T
authors.lastname: Würschum
mesh_terms: D018533:Biomass; D001947:Breeding; D002874:Chromosome Mapping; D002523:Edible Grain / Q000033:anatomy & histology / Q000235:genetics* / Q000254:growth & development; D018745:Genome, Plant; D040641:Quantitative Trait Loci