title: The Arabidopsis nitrate transporter NPF7.3/NRT1.5 is involved in lateral root development under potassium deprivation.
abstract: Plants have evolved a large array of transporters and channels that are responsible for uptake, source-to-sink distribution, homeostasis and signaling of nitrate (NO3(-)), which is for most plants the primary nitrogen source and a growth-limiting macronutrient. To optimize NO3(-) uptake in response to changing NO3(-) concentrations in the soil, plants are able to modify their root architecture. Potassium is another macronutrient that influences the root architecture. We recently demonstrated that the Arabidopsis NO3(-) transporter NPF7.3/NRT1.5, which drives root-to-shoot transport of NO3(-), is also involved in root-to-shoot translocation of K(+) under low NO3(-) nutrition. Here, we show that K(+) shortage, but not limiting NO3(-) supply, causes in nrt1.5 mutant plants an altered root architecture with conspicuously reduced lateral root density. Since lateral root development is influenced by auxin, we discuss a possible involvement of NPF7.3/NRT1.5 in auxin homeostasis in roots under K(+) deprivation.
authors.affiliation: a Institute of Biology / Applied Genetics, Dahlem Center of Plant Sciences, Freie Universität Berlin , Berlin , Germany.
authors.forename: Yue
authors.initials: Y
authors.lastname: Zheng
authors.affiliation: a Institute of Biology / Applied Genetics, Dahlem Center of Plant Sciences, Freie Universität Berlin , Berlin , Germany.
authors.forename: Navina
authors.initials: N
authors.lastname: Drechsler
authors.affiliation: a Institute of Biology / Applied Genetics, Dahlem Center of Plant Sciences, Freie Universität Berlin , Berlin , Germany.
authors.forename: Christine
authors.initials: C
authors.lastname: Rausch
authors.affiliation: a Institute of Biology / Applied Genetics, Dahlem Center of Plant Sciences, Freie Universität Berlin , Berlin , Germany.
authors.forename: Reinhard
authors.initials: R
authors.lastname: Kunze
mesh_terms: D027321:Anion Transport Proteins / Q000378:metabolism*; D017360:Arabidopsis / Q000254:growth & development* / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000378:metabolism*; D005816:Genetic Complementation Test; D009154:Mutation / Q000235:genetics; D000091285:Nitrate Transporters; D009566:Nitrates / Q000378:metabolism; D010641:Phenotype; D018517:Plant Roots / Q000254:growth & development* / Q000378:metabolism; D011188:Potassium / Q000494:pharmacology*; D011401:Promoter Regions, Genetic / Q000235:genetics; D036226:Seedlings / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism
chemical_list: D027321:Anion Transport Proteins; D029681:Arabidopsis Proteins; C539716:NRT1.5 protein, Arabidopsis; D000091285:Nitrate Transporters; D009566:Nitrates; D011188:Potassium
keywords: Arabidopsis thaliana; NPF7.3/NRT1.5; ion homeostasis; lateral root; nitrate transporter; nutrient deficiency; nutrient signaling; potassium transporter; root development