title: A new semi-dwarfing gene identified by molecular mapping of quantitative trait loci in barley.
abstract: Semi-dwarfing genes have been widely used in spring barley (Hordeum vulgare L.) breeding programs in many parts of the world, but the success in developing barley cultivars with semi-dwarfing genes has been limited in North America. Exploiting new semi-dwarfing genes may help in solving this dilemma. A recombinant inbred line population was developed by crossing ZAU 7, a semi-dwarf cultivar from China, to ND16092, a tall breeding line from North Dakota. To identify quantitative trait loci (QTL) controlling plant height, a linkage map comprised of 111 molecular markers was constructed. Simple interval mapping was performed for each of the eight environments. A consistent QTL for plant height was found on chromosome 7HL. This QTL is not associated with maturity and rachis internode length. We suggest the provisional name Qph-7H for this QTL. Qph-7H from ZAU 7 reduced plant height to about 3/4 of normal; thus, Qph-7H is considered a semi-dwarfing gene. Other QTLs for plant height were found, but their expression was variable across the eight environments tested.
authors.affiliation: Department of Entomology, North Dakota State University, Fargo, ND 58105, USA. guotai.yu@ndsu.edu
authors.forename: Guo Tai
authors.initials: GT
authors.lastname: Yu
authors.forename: Richard D
authors.initials: RD
authors.lastname: Horsley
authors.forename: Bingxin
authors.initials: B
authors.lastname: Zhang
authors.forename: Jerome D
authors.initials: JD
authors.lastname: Franckowiak
mesh_terms: D032461:Chromosomes, Plant; D017343:Genes, Plant; D005819:Genetic Markers; D001467:Hordeum / Q000235:genetics* / Q000502:physiology; D040641:Quantitative Trait Loci
chemical_list: D005819:Genetic Markers