title: GID1 modulates stomatal response and submergence tolerance involving abscisic acid and gibberellic acid signaling in rice.
abstract: Plant responses to abiotic stresses are coordinated by arrays of growth and developmental programs. Gibberellic acid (GA) and abscisic acid (ABA) play critical roles in the developmental programs and environmental responses, respectively, through complex signaling and metabolism networks. However, crosstalk between the two phytohormones in stress responses remains largely unknown. In this study, we report that GIBBERELLIN-INSENSITIVE DWARF 1 (GID1), a soluble receptor for GA, regulates stomatal development and patterning in rice (Oryza sativa L.). The gid1 mutant showed impaired biosynthesis of endogenous ABA under drought stress conditions, but it exhibited enhanced sensitivity to exogenous ABA. Scanning electron microscope and infrared thermal image analysis indicated an increase in the stomatal conductance in the gid1 mutant under drought conditions. Interestingly, the gid1 mutant had increased levels of chlorophyll and carbohydrates under submergence conditions, and showed enhanced reactive oxygen species (ROS)-scavenging ability and submergence tolerance compared with the wild-type. Further analyses suggested that the function of GID1 in submergence responses is partially dependent on ABA, and GA signaling by GID1 is involved in submergence tolerance by modulating carbohydrate consumption. Taken together, these findings suggest GID1 plays distinct roles in stomatal response and submergence tolerance through both the ABA and GA signaling pathways in rice.
authors.affiliation: National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Du
authors.affiliation: National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Chang
authors.affiliation: National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Huang
authors.affiliation: National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China.
authors.forename: Lizhong
authors.initials: L
authors.lastname: Xiong
mesh_terms: D000040:Abscisic Acid / Q000096:biosynthesis*; D004734:Energy Metabolism; D005875:Gibberellins / Q000378:metabolism*; D012275:Oryza / Q000502:physiology*; D010940:Plant Proteins / Q000378:metabolism*; D054046:Plant Stomata / Q000502:physiology*; D013312:Stress, Physiological; D014867:Water / Q000502:physiology
chemical_list: D005875:Gibberellins; D010940:Plant Proteins; D014867:Water; D000040:Abscisic Acid; C007842:gibberellic acid
keywords: Abscisic acid; Oryza sativa; carbohydrateconsumption; gibberellic acid; stomata