title: The effects of the photoperiod-insensitive alleles,se13,hd1andghd7, on yield components in rice.
abstract: Flowering time is closely associated with grain yield in rice (Oryza sativaL.). In temperate regions, seasonal changes in day length (known as the photoperiod) are an important environmental cue for floral initiation. The timing of flowering is important not only for successful reproduction, but also for determining the ideal balance between vegetative growth and reproductive growth duration. Recent molecular genetics studies have revealed key flowering time genes responsible for photoperiod sensitivity. In this study, we investigated the effect of three recessive photoperiod-insensitive alleles,se13,hd1andghd7, on yield components in rice underEhd1-deficient genetic background conditions to ensure vegetative growth of each line. We found thatse13-bearing plants had fewer panicles,hd1-bearing plants showed decreased grain-filling percentage, andghd7-bearing plants appeared to have fewer grains per panicle and fewer secondary branches. Our results indicate that the pleiotropic effects of photoperiod-insensitive genes on yield components are independent of short vegetative growth. This will provide critical information which can be used to create photoperiod-insensitive varieties that can be adapted to a wide range of latitudes.
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502 Japan.
authors.forename: Quan
authors.initials: Q
authors.lastname: Xu
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502 Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Saito
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502 Japan.
authors.forename: Ikuo
authors.initials: I
authors.lastname: Hirose
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502 Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Katsura
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502 Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Yoshitake
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502 Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Yokoo
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502 Japan.
authors.forename: Takuji
authors.initials: T
authors.lastname: Tsukiyama
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502 Japan.
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Teraishi
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502 Japan.
authors.forename: Takatoshi
authors.initials: T
authors.lastname: Tanisaka
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502 Japan.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Okumoto
keywords: Flowering time; Grain yield; Photoperiod-insensitive allele; Pleiotropic effect; Rice