title: The blue light receptor Phototropin 1 suppresses lateral root growth by controlling cell elongation.
abstract: We investigated the relationship between the blue light receptor phototropin 1 (phot1) and lateral root growth in Arabidopsis thaliana seedlings. Fluorescence and confocal microscopy images, as well as PHOT1 mRNA expression studies provide evidence that it is highly expressed in the elongation zone of lateral roots where auxin is accumulating. However, treatment with the auxin transport inhibitor N-1-naphthylphthalamic acid significantly reduced PHOT1 expression in this zone. In addition, PHOT1 expression was higher in darkness than in light. The total number of lateral roots was higher in the phot1 mutant than in wild-type Arabidopsis. Cells in the elongation zone of lateral roots of the phot1 mutant were longer than those of wild-type lateral roots. These findings suggest that PHOT1 plays a role(s) in elongation of lateral roots through the control of an auxin-related signalling pathway.
authors.affiliation: School of Biological Sciences, University of Ulsan, Ulsan, Korea.
authors.forename: A
authors.initials: A
authors.lastname: Moni
authors.forename: A-Y
authors.initials: AY
authors.lastname: Lee
authors.forename: W R
authors.initials: WR
authors.lastname: Briggs
authors.forename: I-S
authors.initials: IS
authors.lastname: Han
mesh_terms: D017360:Arabidopsis / Q000235:genetics* / Q000254:growth & development / Q000502:physiology / Q000528:radiation effects; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D001692:Biological Transport / Q000187:drug effects; D018506:Gene Expression Regulation, Plant; D017930:Genes, Reporter; D018546:Hypocotyl / Q000235:genetics / Q000254:growth & development / Q000502:physiology / Q000528:radiation effects; D007210:Indoleacetic Acids / Q000378:metabolism*; D008027:Light; D010641:Phenotype; D010750:Phosphoproteins / Q000235:genetics / Q000378:metabolism*; D018524:Phototropism; D010797:Phthalimides / Q000494:pharmacology; D010937:Plant Growth Regulators / Q000378:metabolism*; D018517:Plant Roots / Q000235:genetics / Q000254:growth & development / Q000502:physiology / Q000528:radiation effects; D030821:Plants, Genetically Modified; D017346:Protein Serine-Threonine Kinases; D011993:Recombinant Fusion Proteins; D036226:Seedlings / Q000235:genetics / Q000254:growth & development / Q000502:physiology / Q000528:radiation effects
chemical_list: D029681:Arabidopsis Proteins; D007210:Indoleacetic Acids; D010750:Phosphoproteins; D010797:Phthalimides; D010937:Plant Growth Regulators; D011993:Recombinant Fusion Proteins; C002687:alpha-naphthylphthalamic acid; C103646:NPH1 protein, Arabidopsis; D017346:Protein Serine-Threonine Kinases
keywords: Auxin; cell elongation; development; lateral root; phototropin