title: Reproductive isolation on interspecific backcross of F1 pollen to parental species, Hemerocallis fulva and H. citrina (Hemerocallidaceae).
abstract: Reproductive failure of backcross could play important roles in determining the evolutionary outcome of hybridization. However, such studies have been somewhat fewer than those of the F1-producing cross and F1 x F1 cross. We conducted hand-pollination backcross experiments using Hemerocallis fulva, H. citrina, and their F1 hybrids. Seed set per flower of the backcrosses reduced to about 50% of the control cross, irrespective of ovule parent species. This symmetrical seed set reduction on the backcross might be caused by the death of backcross embryo as a result of Dobzhansky-Muller incompatibility by recessive alleles.
authors.affiliation: Department of Biology, Faculty of Sciences, Kyushu University, 6-10-1, Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan. yyasuscb@mbox.nc.kyushu-u.ac.jp
authors.forename: Akiko A
authors.initials: AA
authors.lastname: Yasumoto
authors.forename: Tetsukazu
authors.initials: T
authors.lastname: Yahara
mesh_terms: D031421:Hemerocallis / Q000502:physiology*; D006824:Hybridization, Genetic; D011058:Pollen; D012098:Reproduction