title: Inflorescence deficient in abscission controls floral organ abscission in Arabidopsis and identifies a novel family of putative ligands in plants.
abstract: Abscission is an active process that enables plants to shed unwanted organs. Because the purpose of the flower is to facilitate pollination, it often is abscised after fertilization. We have identified an Arabidopsis ethylene-sensitive mutant, inflorescence deficient in abscission (ida), in which floral organs remain attached to the plant body after the shedding of mature seeds, even though a floral abscission zone develops. The IDA gene, positioned in the genomic DNA flanking the single T-DNA present in the ida line, was identified by complementation. The gene encodes a small protein with an N-terminal signal peptide, suggesting that the IDA protein is the ligand of an unknown receptor involved in the developmental control of floral abscission. We have identified Arabidopsis genes, and cDNAs from a variety of plant species, that encode similar proteins, which are distinct from known ligands. IDA and the IDA-like proteins may represent a new class of ligands in plants.
authors.affiliation: Division of Cell and Molecular Biology, University of Oslo, N-0315 Oslo, Norway.
authors.forename: Melinka A
authors.initials: MA
authors.lastname: Butenko
authors.forename: Sara E
authors.initials: SE
authors.lastname: Patterson
authors.forename: Paul E
authors.initials: PE
authors.lastname: Grini
authors.forename: Grethe-Elisabeth
authors.initials: GE
authors.lastname: Stenvik
authors.forename: Silja S
authors.initials: SS
authors.lastname: Amundsen
authors.forename: Abul
authors.initials: A
authors.lastname: Mandal
authors.forename: Reidunn B
authors.initials: RB
authors.lastname: Aalen
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics*; D029681:Arabidopsis Proteins / Q000737:chemistry / Q000235:genetics; D001483:Base Sequence; D017931:DNA Primers; D018744:DNA, Plant / Q000737:chemistry / Q000235:genetics; D035264:Flowers / Q000235:genetics*; D017353:Gene Deletion; D018506:Gene Expression Regulation, Plant / Q000235:genetics*; D008024:Ligands; D008969:Molecular Sequence Data; D016296:Mutagenesis; D010641:Phenotype; D016133:Polymerase Chain Reaction; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
chemical_list: D029681:Arabidopsis Proteins; D017931:DNA Primers; D018744:DNA, Plant; D008024:Ligands