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Author Shi, Chun-Lin ♦ Stenvik, Grethe-Elisabeth ♦ Vie, Ane Kjersti ♦ Bones, Atle M. ♦ Pautot, Véronique ♦ Proveniers, Marcel ♦ Aalen, Reidunn B. ♦ Butenko, Melinka A.
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 ♦ Enzymes and Coenzymes ♦ Amino Acids, Peptides, and Proteins ♦ Chemicals and Drugs ♦ Investigative Techniques ♦ Analytical, Diagnostic and Therapeutic Techniques and Equipment ♦ Chemical Phenomena ♦ Genetic Phenomena ♦ Biological Sciences
Subject Keyword Discipline Botany ♦ Arabidopsis Proteins ♦ Metabolism ♦ Arabidopsis ♦ Anatomy & Histology ♦ Physiology ♦ Flowers ♦ Homeodomain Proteins ♦ Map Kinase Signaling System ♦ Protein-serine-threonine Kinases ♦ Genetics ♦ Ultrastructure ♦ Gene Expression Regulation, Plant ♦ Genetic Complementation Test ♦ Mutation ♦ Phenotype ♦ Plants, Genetically Modified ♦ Promoter Regions, Genetic ♦ Recombinant Fusion Proteins ♦ Transcription Factors ♦ Journal Article ♦ Research Support, Non-u.s. Gov't
Abstract Floral organ abscission in Arabidopsis thaliana is regulated by the putative ligand-receptor system comprising the signaling peptide INFLORESCENCE DEFICIENT IN ABSCISSION (IDA) and the two receptor-like kinases HAESA and HAESA-LIKE2. The IDA signaling pathway presumably activates a MITOGEN-ACTIVATED PROTEIN KINASE (MAPK) cascade to induce separation between abscission zone (AZ) cells. Misexpression of IDA effectuates precocious floral abscission and ectopic cell separation in latent AZ cell regions, which suggests that negative regulators are in place to prevent unrestricted and untimely AZ cell separation. Through a screen for mutations that restore floral organ abscission in ida mutants, we identified three new mutant alleles of the KNOTTED-LIKE HOMEOBOX gene BREVIPEDICELLUS (BP)/KNOTTED-LIKE FROM ARABIDOPSIS THALIANA1 (KNAT1). Here, we show that bp mutants, in addition to shedding their floral organs prematurely, have phenotypic commonalities with plants misexpressing IDA, such as enlarged AZ cells. We propose that BP/KNAT1 inhibits floral organ cell separation by restricting AZ cell size and number and put forward a model whereby IDA signaling suppresses BP/KNAT1, which in turn allows KNAT2 and KNAT6 to induce floral organ abscission.
Description Country affiliation: Norway
Author Affiliation: Shi CL ( Department of Molecular Biosciences, University of Oslo, N-0316 Oslo, Norway.)
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 2011-07-01
Publisher Place United States
e-ISSN 1531298X
Volume Number 23
Issue Number 7

Source: WHO-Global Index Medicus