title: Phenotype/genotype associations for yield and salt tolerance in a barley mapping population segregating for two dwarfing genes.
abstract: Barley traits related to salt tolerance are mapped in a population segregating for a dwarfing gene associated with salt tolerance. Twelve quantitative trait loci (QTLs) were detected for seven seedling traits in doubled haploids from the spring barley cross Derkado x B83-12/21/5 when given saline treatment in hydroponics. The location of QTLs for seedling growth stage (leaf appearance rate), stem weight prior to elongation, and tiller number are reported for the first time. In addition, four QTLs were found for the mature plant traits grain nitrogen and plot yield. In total, seven QTLs are co-located with the dwarfing genes sdw1, on chromosome 3H, and ari-e.GP, on chromosome 5H, including seedling leaf response (SGa) to gibberellic acid (GA(3)). QTLs controlling the growth of leaves (GS2) on chromosomes 2H and 3H and emergence of tillers (TN2) and grain yield were independent of the dwarfing genes. Field trials were grown in eastern Scotland and England to estimate yield and grain composition. A genetic map was used to compare the positions of QTLs for seedling traits with the location of QTLs for the mature plant traits. The results are discussed in relation to the study of barley physiology and the location of genes for dwarf habit and responses to GA.
authors.affiliation: Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, Scotland, UK. r.ellis@scri.sari.ac.uk
authors.forename: R P
authors.initials: RP
authors.lastname: Ellis
authors.forename: B P
authors.initials: BP
authors.lastname: Forster
authors.forename: D C
authors.initials: DC
authors.lastname: Gordon
authors.forename: L L
authors.initials: LL
authors.lastname: Handley
authors.forename: R P
authors.initials: RP
authors.lastname: Keith
authors.forename: P
authors.initials: P
authors.lastname: Lawrence
authors.forename: R
authors.initials: R
authors.lastname: Meyer
authors.forename: W
authors.initials: W
authors.lastname: Powell
authors.forename: D
authors.initials: D
authors.lastname: Robinson
authors.forename: C M
authors.initials: CM
authors.lastname: Scrimgeour
authors.forename: G
authors.initials: G
authors.lastname: Young
authors.forename: W T B
authors.initials: WT
authors.lastname: Thomas
mesh_terms: D000222:Adaptation, Physiological / Q000187:drug effects / Q000235:genetics; D002874:Chromosome Mapping / Q000379:methods*; D005819:Genetic Markers; D005838:Genotype; D005875:Gibberellins / Q000494:pharmacology*; D001467:Hordeum / Q000187:drug effects / Q000235:genetics* / Q000254:growth & development; D010641:Phenotype; D018515:Plant Leaves / Q000187:drug effects / Q000235:genetics / Q000254:growth & development; D018517:Plant Roots / Q000187:drug effects / Q000235:genetics / Q000254:growth & development; D018520:Plant Shoots / Q000187:drug effects / Q000235:genetics / Q000254:growth & development; D019655:Quantitative Trait, Heritable; D012492:Salts / Q000494:pharmacology
chemical_list: D005819:Genetic Markers; D005875:Gibberellins; D012492:Salts; C007842:gibberellic acid