title: Relationship between transmission ratio distortion and genetic divergence in intraspecific rice crosses.
abstract: The strength of reproductive isolation often correlates positively with parental divergence in both animals and plants. Here, we assess the relationship between transmission ratio distortion (TRD) of marker loci and parental divergence in intraspecific rice (Oryza sativa L.) crosses. We produced 10 diverse F(2) populations by crossing a temperate japonica reference accession with each of 10 donor accessions belonging to subpopulations different from the reference accession, and then genotyped the F(2) populations using molecular markers distributed across the entire genome. Significant TRDs (α = 0.05) were detected in 9 of the 10 F(2) populations. TRD regions on chromosomes 3 and 6 were common to several populations; in contrast, other TRD regions were unique to a single population, indicating the diversification of genomic location of TRDs among the populations. The level of TRD (estimated from the overall number and magnitude of TRDs) was significantly correlated with the genetic distance between the donor accessions and the reference accession. Our results suggest that in intraspecific rice crosses, parental divergence may result in diversification of the TRD pattern, followed by an increase in the level of TRD.
authors.affiliation: National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba, Ibaraki, 305-8602, Japan.
authors.forename: Kazuki
authors.initials: K
authors.lastname: Matsubara
authors.forename: Kaworu
authors.initials: K
authors.lastname: Ebana
authors.forename: Tatsumi
authors.initials: T
authors.lastname: Mizubayashi
authors.forename: Sachie
authors.initials: S
authors.lastname: Itoh
authors.forename: Tsuyu
authors.initials: T
authors.lastname: Ando
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Nonoue
authors.forename: Nozomi
authors.initials: N
authors.lastname: Ono
authors.forename: Taeko
authors.initials: T
authors.lastname: Shibaya
authors.forename: Eri
authors.initials: E
authors.lastname: Ogiso
authors.forename: Kiyosumi
authors.initials: K
authors.lastname: Hori
authors.forename: Shuichi
authors.initials: S
authors.lastname: Fukuoka
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yano
mesh_terms: D032461:Chromosomes, Plant; D003433:Crosses, Genetic; D040961:Genetic Drift; D018745:Genome, Plant; D012275:Oryza / Q000235:genetics*; D013045:Species Specificity