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Author Sun, Jiaqiang ♦ Qi, Linlin ♦ Li, Yanan ♦ Zhai, Qingzhe ♦ Li, Chuanyou
Source World Health Organization (WHO)-Global Index Medicus
Content type Text
Publisher American Society of Plant Biologists
File Format HTM / HTML
Language English
Difficulty Level Medium
Subject Domain (in DDC) Natural sciences & mathematics ♦ Chemistry & allied sciences ♦ Life sciences; biology ♦ Physiology & related subjects ♦ Biochemistry ♦ Genetics and evolution ♦ Natural history of organisms ♦ Technology ♦ Medicine & health ♦ Human anatomy, cytology, histology ♦ Human physiology ♦ Pharmacology and therapeutics ♦ Diseases ♦ Manufacture for specific uses ♦ Precision instruments & other devices
Subject Domain (in MeSH) Plant Structures ♦ Anatomy ♦ Eukaryota ♦ Organisms ♦ Heterocyclic Compounds ♦ Amino Acids, Peptides, and Proteins ♦ Chemical Actions and Uses ♦ Chemicals and Drugs ♦ Investigative Techniques ♦ Analytical, Diagnostic and Therapeutic Techniques and Equipment ♦ Physical Phenomena ♦ Chemical Phenomena ♦ Genetic Phenomena ♦ Physiological Phenomena ♦ Biological Sciences
Subject Keyword Discipline Botany ♦ Arabidopsis Proteins ♦ Genetics ♦ Arabidopsis ♦ Basic Helix-loop-helix Transcription Factors ♦ Indoleacetic Acids ♦ Pharmacology ♦ Light ♦ Drug Effects ♦ Radiation Effects ♦ Metabolism ♦ Gene Expression Regulation, Plant ♦ Hypocotyl ♦ Immunoblotting ♦ Mutation ♦ Phototropism ♦ Plant Growth Regulators ♦ Plants, Genetically Modified ♦ Promoter Regions, Genetic ♦ Protein Binding ♦ Reverse Transcriptase Polymerase Chain Reaction ♦ Seedling ♦ Transcription Factors ♦ Two-hybrid System Techniques ♦ Journal Article ♦ Research Support, Non-u.s. Gov't
Abstract Both blue light (BL) and auxin are essential for phototropism in Arabidopsis thaliana. However, the mechanisms by which light is molecularly linked to auxin during phototropism remain elusive. Here, we report that phytochrome interacting factoR4 (PIF4) and PIF5 act downstream of the BL sensor phototropin1 (PHOT1) to negatively modulate phototropism in Arabidopsis. We also reveal that PIF4 and PIF5 negatively regulate auxin signaling. Furthermore, we demonstrate that PIF4 directly activates the expression of the auxin/indole-3-acetic acid (IAA) genes IAA19 and IAA29 by binding to the G-box (CACGTG) motifs in their promoters. Our genetic assays demonstrate that IAA19 and IAA29, which physically interact with auxin response factor7 (ARF7), are sufficient for PIF4 to negatively regulate auxin signaling and phototropism. This study identifies a key step of phototropic signaling in Arabidopsis by showing that PIF4 and PIF5 link light and auxin.
Description Country affiliation: China
Author Affiliation: Sun J ( State Key Laboratory of Plant Genomics, National Centre for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.)
ISSN 10404651
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Reading ♦ Research ♦ Self Learning
Interactivity Type Expositive
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2013-06-01
Publisher Place United States
e-ISSN 1531298X
Journal THE PLANT CELL ONLINE
Volume Number 25
Issue Number 6


Source: WHO-Global Index Medicus