A new semi-dwarfing gene identified by molecular mapping of quantitative trait loci in barley.
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.
Yu
Guo Tai
GT
Department of Entomology, North Dakota State University, Fargo, ND 58105, USA. guotai.yu@ndsu.edu
Horsley
Richard D
RD
Zhang
Bingxin
B
Franckowiak
Jerome D
JD
D032461:Chromosomes, Plant; D017343:Genes, Plant; D005819:Genetic Markers; D001467:Hordeum / Q000235:genetics* / Q000502:physiology; D040641:Quantitative Trait Loci
D005819:Genetic Markers