title: Role of the rice transcription factor JAmyb in abiotic stress response.
abstract: Plants have developed certain adaptive responses to environmental stresses that cause adverse effects on growth. To identify genes involved in the adaptive mechanisms, we constructed a large population of transgenic Arabidopsis expressing rice full-length cDNAs, and performed gain-of-function screening under high-salinity stress. In this study, we identified a rice R2R3-type MYB transcription factor gene, JAmyb, as a gene whose overexpression causes tolerance to high salinity. JAmyb overexpression in transgenic Arabidopsis improved tolerance to high-salinity stress during seed germination, seedling growth, and root elongation. In rice seedlings, JAmyb expression was induced by high-salinity and high-osmotic stresses and reactive oxygen species (ROS), suggesting that JAmyb is responsible for abiotic stress response. Microarray analysis showed that the overexpression of JAmyb stimulates the expression of several defense-associated genes, some of which have been predicted to be involved in osmotic adjustment, ROS removal, and ion homeostasis. Several transcription factors involved in the jasmonate (JA)-mediated stress response are also regulated by JAmyb. JAmyb has been reported to be associated with disease response. Our observations suggest that JAmyb plays a role in JA-mediated abiotic stress response in addition to biotic stress response in rice.
authors: Research Institute for Biological Sciences, Okayama Prefectural Technology Center for Agriculture, Forestry, and Fisheries, 7549-1 Yoshikawa, Kibichuo, Okayama 716-1241, Japan.
authors: Naoki
authors: N
authors: Yokotani
authors: Takanari
authors: T
authors: Ichikawa
authors: Youichi
authors: Y
authors: Kondou
authors: Masaki
authors: M
authors: Iwabuchi
authors: Minami
authors: M
authors: Matsui
authors: Hirohiko
authors: H
authors: Hirochika
authors: Kenji
authors: K
authors: Oda
mesh_terms: D000222:Adaptation, Physiological / Q000235:genetics*; D017360:Arabidopsis / Q000235:genetics*; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D018525:Germination / Q000235:genetics; D006706:Homeostasis / Q000235:genetics; D012275:Oryza / Q000235:genetics*; D009997:Osmotic Pressure / Q000502:physiology; D018517:Plant Roots / Q000254:growth & development; D030821:Plants, Genetically Modified / Q000254:growth & development; D017382:Reactive Oxygen Species; D054712:Salinity; D055049:Salt Tolerance / Q000235:genetics*; D036226:Seedlings / Q000254:growth & development; D012639:Seeds / Q000254:growth & development; D012965:Sodium Chloride / Q000378:metabolism; D013312:Stress, Physiological / Q000235:genetics*; D014157:Transcription Factors / Q000378:metabolism*
chemical_list: D017382:Reactive Oxygen Species; D014157:Transcription Factors; D012965:Sodium Chloride