title: Plant U-box armadillo repeat proteins AtPUB18 and AtPUB19 are involved in salt inhibition of germination in Arabidopsis.
abstract: Plant U-box armadillo repeat (PUB-ARM) proteins represent a type of E3 ubiquitin ligase. PUB-ARM proteins have various functions in plant development, plant defence and plant stress responses. The so far uncharacterised PUB-ARM proteins AtPUB18 and AtPUB19 are highly homologous to each other and regulated on the transcript level by ABA and NaCl. To investigate their physiological function, we isolated and characterised two Arabidopsis mutants and named them pub18-1 and pub19-1. However, these single mutants did not show any ABA- or salt-dependent phenotype. In contrast, pub18-1/pub19-1 double mutant seeds were less sensitive to ABA and NaCl inhibition of seed germination compared to wild-type seeds, indicating that both PUB-ARM proteins may coordinately function as regulatory components in ABA or salt inhibition of germination.
authors.affiliation: Molekulare Pflanzenphysiologie, Department Biologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Bergler
authors.forename: S
authors.initials: S
authors.lastname: Hoth
mesh_terms: D000040:Abscisic Acid / Q000235:genetics / Q000378:metabolism; D017360:Arabidopsis / Q000187:drug effects* / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D018506:Gene Expression Regulation, Plant; D014644:Genetic Variation; D018525:Germination / Q000187:drug effects* / Q000235:genetics / Q000502:physiology; D009154:Mutation; D010937:Plant Growth Regulators / Q000378:metabolism; D030821:Plants, Genetically Modified; D054712:Salinity; D012639:Seeds / Q000254:growth & development / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects / Q000235:genetics; D012965:Sodium Chloride / Q000494:pharmacology; D014158:Transcription, Genetic; D044767:Ubiquitin-Protein Ligases / Q000235:genetics / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; D010937:Plant Growth Regulators; D012965:Sodium Chloride; D000040:Abscisic Acid; D044767:Ubiquitin-Protein Ligases