title: Differential responses of Arabidopsis thaliana accessions to atmospheric nitrogen dioxide at ambient concentrations.
abstract: To better understand the response of plants to atmospheric nitrogen dioxide (NO2), we investigated biomass accumulation in 3 accessions of Arabidopsis thaliana: C24, Columbia (Col-0), and Landsberg erecta (Ler). Plants were grown in NO2-free air for 1 week after sowing, followed by 3 (Col-0 and Ler) to 4 (C24) weeks in air with or without NO 2 (10 or 50 ppb). NO2 treatment increased the biomass of all 3 accessions to varying extents. Treatment with 10 ppb NO2 increased shoot biomass in C24, Col-0, and Ler by 3.2-, 1.4-, and 2.3-fold, respectively, compared with control. Treatment with 50 ppb gave similar increases, except in C24 (2.7-fold). The physiological, evolutionary, and genetic significance of these results are discussed below.
authors.affiliation: Department of Mathematical and Life Sciences; Hiroshima University; Higashi-Hiroshima, Japan.
authors.forename: Misa
authors.initials: M
authors.lastname: Takahashi
authors.affiliation: Department of Mathematical and Life Sciences; Hiroshima University; Higashi-Hiroshima, Japan.
authors.forename: Hiromichi
authors.initials: H
authors.lastname: Morikawa
mesh_terms: D017360:Arabidopsis / Q000187:drug effects* / Q000254:growth & development; D018533:Biomass; D009585:Nitrogen Dioxide / Q000494:pharmacology*; D013045:Species Specificity
chemical_list: D009585:Nitrogen Dioxide
keywords: Arabidopsis thaliana; C24; Columbia (Col-0); Landsberg eracta (Ler); ambient concentration; nitric oxide (NO); nitrogen dioxide (NO2); positive regulator