Back to Search Start Over

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

Authors :
Grethe-Elisabeth Stenvik
Ane Kjersti Vie
Marcel C.G. Proveniers
Reidunn B. Aalen
Atle M. Bones
Véronique Pautot
Melinka A. Butenko
Chun-Lin Shi
Department of Molecular Biosciences [Oslo]
Faculty of Mathematics and Natural Sciences [Oslo]
University of Oslo (UiO)-University of Oslo (UiO)
Department of Biology [Trondheim]
Norwegian University of Science and Technology [Trondheim] (NTNU)
Institut Jean-Pierre Bourgin (IJPB)
Institut National de la Recherche Agronomique (INRA)-AgroParisTech
Dept Biol, Fac Sci
Utrecht University [Utrecht]
Research Council of Norway [175238/S10, 178049]
Department of Biology [Trondheim] (IBI NTNU)
Norwegian University of Science and Technology (NTNU)-Norwegian University of Science and Technology (NTNU)
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.

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⟩