title: Isolation of a novel lodging resistance QTL gene involved in strigolactone signaling and its pyramiding with a QTL gene involved in another mechanism.
abstract: Lodging has been a major roadblock to attaining increased crop productivity. In an attempt to understand the mechanism for culm strength in rice, we isolated an effective quantitative trait locus (QTL), STRONG CULM3 (SCM3), the causal gene of which is identical to rice TEOSINTE BRANCHED1 (OsTB1), a gene previously reported to positively control strigolactone (SL) signaling. A near-isogenic line (NIL) carrying SCM3 showed enhanced culm strength and increased spikelet number despite the expected decrease in tiller number, indicating that SL also has a positive role in enhancing culm strength and spikelet number. We produced a pyramiding line carrying SCM3 and SCM2, another QTL encoding APO1 involved in panicle development. The NIL-SCM2+SCM3 showed a much stronger culm than NIL-SCM2 and NIL-SCM3 and an increased spikelet number caused by the additive effect of these QTLs. We discuss the importance of utilizing suitable alleles of these STRONG CULM QTLs without inducing detrimental traits for breeding.
authors.affiliation: Bioscience and Biotechnology Center, Nagoya University, Nagoya, Aichi 464-8601, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Yano
authors.affiliation: Graduate School of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
authors.forename: Taiichiro
authors.initials: T
authors.lastname: Ookawa
authors.affiliation: Bioscience and Biotechnology Center, Nagoya University, Nagoya, Aichi 464-8601, Japan.
authors.forename: Koichiro
authors.initials: K
authors.lastname: Aya
authors.affiliation: Graduate School of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Ochiai
authors.affiliation: Graduate School of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Hirasawa
authors.affiliation: Agricultural Research Institute, Toyama Agricultural, Forestry & Fisheries Research Center, Toyama 939-8153, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ebitani
authors.affiliation: Agricultural Research Institute, Toyama Agricultural, Forestry & Fisheries Research Center, Toyama 939-8153, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Takarada
authors.affiliation: National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yano
authors.affiliation: National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan.
authors.forename: Toshio
authors.initials: T
authors.lastname: Yamamoto
authors.affiliation: National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan.
authors.forename: Shuichi
authors.initials: S
authors.lastname: Fukuoka
authors.affiliation: National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan.
authors.forename: Jianzhong
authors.initials: J
authors.lastname: Wu
authors.affiliation: National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan.
authors.forename: Tsuyu
authors.initials: T
authors.lastname: Ando
authors.affiliation: Bioscience and Biotechnology Center, Nagoya University, Nagoya, Aichi 464-8601, Japan.
authors.forename: Reynante Lacsamana
authors.initials: RL
authors.lastname: Ordonio
authors.affiliation: Bioscience and Biotechnology Center, Nagoya University, Nagoya, Aichi 464-8601, Japan.
authors.forename: Ko
authors.initials: K
authors.lastname: Hirano
authors.affiliation: Bioscience and Biotechnology Center, Nagoya University, Nagoya, Aichi 464-8601, Japan. Electronic address: makoto@agr.nagoya-u.ac.jp.
authors.forename: Makoto
authors.initials: M
authors.lastname: Matsuoka
mesh_terms: D060467:Disease Resistance / Q000235:genetics / Q000502:physiology; D007783:Lactones / Q000378:metabolism*; D012275:Oryza / Q000235:genetics* / Q000378:metabolism*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D040641:Quantitative Trait Loci / Q000235:genetics*; D015398:Signal Transduction
chemical_list: D007783:Lactones; D010940:Plant Proteins
keywords: OsTB1; culm; lodging resistance; quantitative trait loci; strigolactone