title: Control of root system architecture by DEEPER ROOTING 1 increases rice yield under drought conditions.
abstract: The genetic improvement of drought resistance is essential for stable and adequate crop production in drought-prone areas. Here we demonstrate that alteration of root system architecture improves drought avoidance through the cloning and characterization of DEEPER ROOTING 1 (DRO1), a rice quantitative trait locus controlling root growth angle. DRO1 is negatively regulated by auxin and is involved in cell elongation in the root tip that causes asymmetric root growth and downward bending of the root in response to gravity. Higher expression of DRO1 increases the root growth angle, whereby roots grow in a more downward direction. Introducing DRO1 into a shallow-rooting rice cultivar by backcrossing enabled the resulting line to avoid drought by increasing deep rooting, which maintained high yield performance under drought conditions relative to the recipient cultivar. Our experiments suggest that control of root system architecture will contribute to drought avoidance in crops.
authors.affiliation: National Institute of Agrobiological Sciences, Tsukuba, Japan. yuga@nias.affrc.go.jp
authors.forename: Yusaku
authors.initials: Y
authors.lastname: Uga
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Sugimoto
authors.forename: Satoshi
authors.initials: S
authors.lastname: Ogawa
authors.forename: Jagadish
authors.initials: J
authors.lastname: Rane
authors.forename: Manabu
authors.initials: M
authors.lastname: Ishitani
authors.forename: Naho
authors.initials: N
authors.lastname: Hara
authors.forename: Yuka
authors.initials: Y
authors.lastname: Kitomi
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Inukai
authors.forename: Kazuko
authors.initials: K
authors.lastname: Ono
authors.forename: Noriko
authors.initials: N
authors.lastname: Kanno
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Inoue
authors.forename: Hinako
authors.initials: H
authors.lastname: Takehisa
authors.forename: Ritsuko
authors.initials: R
authors.lastname: Motoyama
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Nagamura
authors.forename: Jianzhong
authors.initials: J
authors.lastname: Wu
authors.forename: Takashi
authors.initials: T
authors.lastname: Matsumoto
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Takai
authors.forename: Kazutoshi
authors.initials: K
authors.lastname: Okuno
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yano
mesh_terms: D000220:Adaptation, Biological / Q000235:genetics; D055864:Droughts; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D023061:Gene Order; D017343:Genes, Plant; D005838:Genotype; D008969:Molecular Sequence Data; D012275:Oryza / Q000235:genetics* / Q000254:growth & development*; D010641:Phenotype; D010937:Plant Growth Regulators / Q000494:pharmacology; D018517:Plant Roots / Q000166:cytology / Q000235:genetics* / Q000254:growth & development*; D040641:Quantitative Trait Loci
chemical_list: D010937:Plant Growth Regulators
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