title: Precise estimation of genomic regions controlling lodging resistance using a set of reciprocal chromosome segment substitution lines in rice.
abstract: Severe lodging has occurred in many improved rice varieties after the recent strong typhoons in East and Southeast Asian countries. The indica variety Takanari possesses strong culm characteristics due to its large section modulus, which indicates culm thickness, whereas the japonica variety Koshihikari is subject to substantial bending stress due to its thick cortical fibre tissue. To detect quantitative trait loci (QTLs) for lodging resistance and to eliminate the effects of genetic background, we used reciprocal chromosome segment substitution lines (CSSLs) derived from a cross between Koshihikari and Takanari. The oppositional effects of QTLs for section modulus were confirmed in both genetic backgrounds on chromosomes 1, 5 and 6, suggesting that these QTLs are not affected by the genetic background and are controlled independently by a single factor. The candidate region of a QTL for section modulus included SD1. The section modulus of NIL-sd1 was lower than that of Koshihikari, whereas the section modulus of NIL-SD1 was higher than that of Takanari. This result indicated that those regions regulate the culm thickness. The reciprocal effects of the QTLs for cortical fibre tissue thickness were confirmed in both genetic backgrounds on chromosome 9 using CSSLs.
authors.affiliation: Institute of Agriculture, Graduate School, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
authors.forename: Taiichiro
authors.initials: T
authors.lastname: Ookawa
authors.affiliation: Institute of Agriculture, Graduate School, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Aoba
authors.affiliation: NARO Agrogenomics Research Center, Tsukuba, Ibaraki 305-8602, Japan.
authors.forename: Toshio
authors.initials: T
authors.lastname: Yamamoto
authors.affiliation: NARO Agrogenomics Research Center, Tsukuba, Ibaraki 305-8602, Japan.
authors.forename: Tadamasa
authors.initials: T
authors.lastname: Ueda
authors.affiliation: Japan International Research Center for Agricultural Sciences, Tsukuba, Ibaraki 305-8686, Japan.
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Takai
authors.affiliation: NARO Agrogenomics Research Center, Tsukuba, Ibaraki 305-8602, Japan.
authors.forename: Shuichi
authors.initials: S
authors.lastname: Fukuoka
authors.affiliation: NARO Agrogenomics Research Center, Tsukuba, Ibaraki 305-8602, Japan.
authors.forename: Tsuyu
authors.initials: T
authors.lastname: Ando
authors.affiliation: Institute of Agriculture, Graduate School, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Adachi
authors.affiliation: Bioscience and Biotechnology Center, Nagoya University, Nagoya, Aichi 464-8601, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Matsuoka
authors.affiliation: Agricultural Research Institute, Toyama Agricultural, Forestry &Fisheries Research Center, Toyama, Toyama 939-8153, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ebitani
authors.affiliation: International Rice Research Institute, Los Banos, Philippines.
authors.forename: Yoichiro
authors.initials: Y
authors.lastname: Kato
authors.affiliation: Institute of Agriculture, Graduate School, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
authors.forename: Indria Wahyu
authors.initials: IW
authors.lastname: Mulsanti
authors.affiliation: International Maize and Wheat Improvement Center, Texcoco, 56237, Mexico.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kishii
authors.affiliation: International Maize and Wheat Improvement Center, Texcoco, 56237, Mexico.
authors.forename: Matthew
authors.initials: M
authors.lastname: Reynolds
authors.affiliation: International Maize and Wheat Improvement Center, Texcoco, 56237, Mexico.
authors.forename: Francisco
authors.initials: F
authors.lastname: Piñera
authors.affiliation: Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan.
authors.forename: Toshihisa
authors.initials: T
authors.lastname: Kotake
authors.affiliation: Department of Plant Physiology, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan.
authors.forename: Shinji
authors.initials: S
authors.lastname: Kawasaki
authors.affiliation: Institute of Agriculture, Graduate School, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Motobayashi
authors.affiliation: Institute of Agriculture, Graduate School, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Hirasawa
mesh_terms: D032461:Chromosomes, Plant; D018745:Genome, Plant; D012275:Oryza / Q000235:genetics* / Q000502:physiology; D040641:Quantitative Trait Loci