title: Detection of QTLs for white-back and basal-white grains caused by high temperature during ripening period in japonica rice.
abstract: There is increasing evidence that global warming affects the development of rice. High temperatures during ripening increase the ratio of undesirable chalky grains followed by deteriorating grain appearance quality. In order to detect quantitative trait loci (QTLs) controlling the occurrence of white-back and basal-white chalky grains of brown rice, QTL analysis was performed using recombinant inbred lines derived from a cross between two strains, 'Tsukushiroman' (sensitive to heat stress) and 'Chikushi 52' (tolerant of heat stress). The F7 and F8 lines were exposed to heat stress during the ripening period in two locations, Fukuoka and Kagoshima, in Japan. QTLs for white-back grains and basal-white grains were detected on chromosomes 1, 3, and 8, and those for basal-white grains were detected on chromosomes 2, 3, and 12. QTLs on chromosome 8 for white-back grains were shared in the plants grown in both locations. Near-isogenic lines (NILs), which harbored a segment from 'Chikushi 52' on chromosome 8 with the genetic background of 'Tsukushiroman', showed relatively lower ratios of white-back grains than 'Tsukushiroman'. Therefore, insertion of the 'Chikushi 52' genomic region of the QTL on chromosome 8 can improve the quality of rice when it is grown under heat stress conditions.
authors.affiliation: Fukuoka Agriculture and Forestry Research Center , 587 Yoshiki, Chikushino, Fukuoka 818-8549 , Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Wada
authors.affiliation: Fukuoka Agriculture and Forestry Research Center , 587 Yoshiki, Chikushino, Fukuoka 818-8549 , Japan.
authors.forename: Katsunori
authors.initials: K
authors.lastname: Miyahara
authors.affiliation: Kagoshima Prefectural Institute for Agricultural Development , 2200 Ohno Kinpou-chou, Minami-Satsuma, Kagoshima 899-3401 , Japan.
authors.forename: Jun-Ya
authors.initials: JY
authors.lastname: Sonoda
authors.affiliation: Faculty of Bioresources and Environment Science, Ishikawa Prefectural University , 1-308 Suematsu, Nonoichi, Ishikawa 921-8836 , Japan.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Tsukaguchi
authors.affiliation: Fukuoka Agriculture and Forestry Research Center , 587 Yoshiki, Chikushino, Fukuoka 818-8549 , Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Miyazaki
authors.affiliation: Fukuoka Agriculture and Forestry Research Center , 587 Yoshiki, Chikushino, Fukuoka 818-8549 , Japan.
authors.forename: Masao
authors.initials: M
authors.lastname: Tsubone
authors.affiliation: Institute of the Society for Techno-Innovation of Agriculture, Forestry and Fisheries , 446-1 Ippaizuka, Kamiyokoba, Tsukuba, Ibaraki 305-0854 , Japan.
authors.forename: Tsuyu
authors.initials: T
authors.lastname: Ando
authors.affiliation: National Institute of Agrobiological Science , 2-1-1 Kannondai, Tsukuba, Ibaraki 305-8602 , Japan.
authors.forename: Kaworu
authors.initials: K
authors.lastname: Ebana
authors.affiliation: National Institute of Agrobiological Science , 2-1-1 Kannondai, Tsukuba, Ibaraki 305-8602 , Japan.
authors.forename: Toshio
authors.initials: T
authors.lastname: Yamamoto
authors.affiliation: NARO Institute of Crop Science , 2-1-18 Kannondai, Tsukuba, Ibaraki 305-8518 , Japan.
authors.forename: Norio
authors.initials: N
authors.lastname: Iwasawa
authors.affiliation: NARO Institute of Crop Science , 2-1-18 Kannondai, Tsukuba, Ibaraki 305-8518 , Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Umemoto
authors.affiliation: NARO Institute of Crop Science , 2-1-18 Kannondai, Tsukuba, Ibaraki 305-8518 , Japan.
authors.forename: Motohiko
authors.initials: M
authors.lastname: Kondo
authors.affiliation: National Institute of Agrobiological Science , 2-1-1 Kannondai, Tsukuba, Ibaraki 305-8602 , Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yano
keywords: QTL; basal-white grain; rice; tolerance to high temperature; white-back grain