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The Tinkerbell (Tink) Mutation Identifies the Dual-Specificity MAPK Phosphatase INDOLE-3-BUTYRIC ACID-RESPONSE5 (IBR5) as a Novel Regulator of Organ Size in Arabidopsis
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The Tinkerbell (Tink) Mutation Identifies the Dual-Specificity MAPK Phosphatase INDOLE-3-BUTYRIC ACID-RESPONSE5 (IBR5) as a Novel Regulator of Organ Size in Arabidopsis
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The Tinkerbell (Tink) Mutation Identifies the Dual-Specificity MAPK Phosphatase INDOLE-3-BUTYRIC ACID-RESPONSE5 (IBR5) as a Novel Regulator of Organ Size in Arabidopsis
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Journal Article
The Tinkerbell (Tink) Mutation Identifies the Dual-Specificity MAPK Phosphatase INDOLE-3-BUTYRIC ACID-RESPONSE5 (IBR5) as a Novel Regulator of Organ Size in Arabidopsis
2015
Overview
Mitogen-activated dual-specificity MAPK phosphatases are important negative regulators in the MAPK signalling pathways responsible for many essential processes in plants. In a screen for mutants with reduced organ size we have identified a mutation in the active site of the dual-specificity MAPK phosphatase indole-3-butyric acid-response5 (IBR5) that we named tinkerbell (tink) due to its small size. Analysis of the tink mutant indicates that IBR5 acts as a novel regulator of organ size that changes the rate of growth in petals and leaves. Organ size and shape regulation by IBR5 acts independently of the KLU growth-regulatory pathway. Microarray analysis of tink/ibr5-6 mutants identified a likely role for this phosphatase in male gametophyte development. We show that IBR5 may influence the size and shape of petals through auxin and TCP growth regulatory pathways.
Publisher
Public Library of Science (PLoS),Public Library of Science
Subject
/ Arabidopsis - growth & development
/ Arabidopsis Proteins - genetics
/ Arabidopsis Proteins - physiology
/ Cytochrome P-450 Enzyme System
/ Cytochrome P-450 Enzyme System - physiology
/ Dual-Specificity Phosphatases
/ Dual-Specificity Phosphatases - genetics
/ Dual-Specificity Phosphatases - physiology
/ Flowers
/ Flowers - growth & development
/ Gene Expression Regulation, Plant
/ Genes
/ Indoleacetic Acids - pharmacology
/ Institut für Biochemie und Biologie
/ Kinases
/ Leaves
/ Medicine
/ Mutants
/ Mutation
/ Petals
/ Plant Leaves - growth & development
/ Pollen
/ Pollen - growth & development
/ Proteins
/ Q
/ R
/ Science
/ Sequence Homology, Amino Acid
/ Signal Transduction - genetics
