title: Fine mapping of a gene for low-tiller number, Ltn, in japonica rice (Oryza sativa L.) variety Aikawa 1.
abstract: Tillering is one of the most important agronomic traits related to grain production in rice (Oryza sativa L.). A japonica-type variety, Aikawa 1, is known to have low-tiller number. The detailed location of a low-tillering gene, Ltn, which has been localized on chromosome 8 in Aikawa 1, was confirmed by molecular mapping. Using BC5F2 individuals derived from a cross between IR64 and Aikawa 1, the low-tillering gene was mapped to an interval defined by SSR markers ssr5816-3 and A4765. This was designated as Ltn because there was no reported gene for tillering in the region of chromosome 8. Through high-resolution linkage analysis, the candidate region of Ltn was located between DNA markers ssr6049-23 and ind6049-1 corresponding to 38.6 kbp on the Nipponbare genome sequence. These DNA markers, which were tightly linked to Ltn, are useful for marker-assisted selection in breeding studies.
authors.affiliation: International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Fujita
authors.forename: Leodegario A
authors.initials: LA
authors.lastname: Ebron
authors.forename: Etsuko
authors.initials: E
authors.lastname: Araki
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kato
authors.forename: Gurdev S
authors.initials: GS
authors.lastname: Khush
authors.forename: John E
authors.initials: JE
authors.lastname: Sheehy
authors.forename: Tanguy
authors.initials: T
authors.lastname: Lafarge
authors.forename: Yoshimichi
authors.initials: Y
authors.lastname: Fukuta
authors.forename: Nobuya
authors.initials: N
authors.lastname: Kobayashi
mesh_terms: D000383:Agriculture; D020029:Base Pairing / Q000235:genetics; D002874:Chromosome Mapping / Q000379:methods*; D020090:Chromosome Segregation / Q000235:genetics; D032461:Chromosomes, Plant / Q000235:genetics; D003433:Crosses, Genetic; D017343:Genes, Plant / Q000235:genetics*; D008040:Genetic Linkage; D005819:Genetic Markers; D005838:Genotype; D007178:Inbreeding; D012275:Oryza / Q000235:genetics* / Q000254:growth & development*; D010641:Phenotype; D019655:Quantitative Trait, Heritable
chemical_list: D005819:Genetic Markers