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Arabidopsis Class I KNOTTED-Like Homeobox Proteins Act Downstream in the IDA-HAE/HSL2 Floral Abscission Signaling Pathway
Arabidopsis Class I KNOTTED-Like Homeobox Proteins Act Downstream in the IDA-HAE/HSL2 Floral Abscission Signaling Pathway
- Source :
- Plant Cell, Plant Cell, American Society of Plant Biologists, 2011, 23 (7), pp.2553-2567. ⟨10.1105/tpc.111.084608⟩, The Plant cell, The Plant cell, American Society of Plant Biologists (ASPB), 2011, 23 (7), pp.2553-2567. ⟨10.1105/tpc.111.084608⟩
- Publication Year :
- 2011
- Publisher :
- HAL CCSD, 2011.
-
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.
- Subjects :
- 0106 biological sciences
EXPRESSION
[SDV.SA]Life Sciences [q-bio]/Agricultural sciences
MAP Kinase Signaling System
Recombinant Fusion Proteins
Mutant
Arabidopsis
Plant Science
Flowers
Protein Serine-Threonine Kinases
01 natural sciences
03 medical and health sciences
INFLORESCENCE-DEFICIENT
Abscission
LEAF
CELL-SEPARATION PROCESSES
Gene Expression Regulation, Plant
Arabidopsis thaliana
PLANTS
Promoter Regions, Genetic
Research Articles
030304 developmental biology
ORGAN ABSCISSION
Genetics
Regulation of gene expression
Homeodomain Proteins
0303 health sciences
biology
THALIANA
Arabidopsis Proteins
Genetic Complementation Test
fungi
food and beverages
Cell Biology
biology.organism_classification
Floral organ abscission
Plants, Genetically Modified
Cell biology
Phenotype
GENE BREVIPEDICELLUS
Mutation
Homeobox
RECEPTOR KINASE
Signal transduction
KNOX HOMEODOMAIN
010606 plant biology & botany
Transcription Factors
Subjects
Details
- Language :
- English
- ISSN :
- 10404651 and 1532298X
- Database :
- OpenAIRE
- Journal :
- Plant Cell, Plant Cell, American Society of Plant Biologists, 2011, 23 (7), pp.2553-2567. ⟨10.1105/tpc.111.084608⟩, The Plant cell, The Plant cell, American Society of Plant Biologists (ASPB), 2011, 23 (7), pp.2553-2567. ⟨10.1105/tpc.111.084608⟩
- Accession number :
- edsair.doi.dedup.....4053d1205b3a79912756e2fa9be22017
- Full Text :
- https://doi.org/10.1105/tpc.111.084608⟩