title: YUCCA8 and YUCCA9 overexpression reveals a link between auxin signaling and lignification through the induction of ethylene biosynthesis.
abstract: Auxin is associated with the regulation of virtually every aspect of plant growth and development. Many previous genetic and biochemical studies revealed that, among the proposed routes for the production of auxin, the so-called indole-3-pyruvic acid (IPA) pathway is the main source for indole-3-acetic acid (IAA) in plants. The IPA pathway involves the action of 2 classes of enzymes, tryptophan-pyruvate aminotransferases (TRYPTOPHAN AMINOTRANSFERASE OF ARABIDOPSIS 1(TAA1)/TRYPTOPHAN AMINOTRANSFERASE RELATED (TAR)) and flavin monooxygenases (YUCCA). Both enzyme classes appear to be encoded by small gene families in Arabidopsis consisting of 5 and 11 members, respectively. We recently showed that it is possible to induce transcript accumulation of 2 YUCCA genes, YUC8 and YUC9, by methyl jasmonate treatment. Both gene products were demonstrated to contribute to auxin biosynthesis in planta. (1) Here we report that the overexpression of YUC8 as well as YUC9 led to strong lignification of plant aerial tissues. Furthermore, new evidence indicates that this abnormally strong secondary growth is linked to increased levels of ethylene production.
authors.affiliation: Department of Plant Physiology; Ruhr-University Bochum; Bochum, Germany.
authors.forename: Mathias
authors.initials: M
authors.lastname: Hentrich
authors.affiliation: Centro de Biotecnología y Genómica de Plantas (UPM-INIA); Campus de Montegancedo; Pozuelo de Alarcón; Madrid, Spain.
authors.forename: Beatriz
authors.initials: B
authors.lastname: Sánchez-Parra
authors.affiliation: Centro de Biotecnología y Genómica de Plantas (UPM-INIA); Campus de Montegancedo; Pozuelo de Alarcón; Madrid, Spain.
authors.forename: Marta-Marina
authors.initials: MM
authors.lastname: Pérez Alonso
authors.affiliation: Centro de Biotecnología y Genómica de Plantas (UPM-INIA); Campus de Montegancedo; Pozuelo de Alarcón; Madrid, Spain.
authors.forename: Víctor
authors.initials: V
authors.lastname: Carrasco Loba
authors.affiliation: Centro de Biotecnología y Genómica de Plantas (UPM-INIA); Campus de Montegancedo; Pozuelo de Alarcón; Madrid, Spain.
authors.forename: Laura
authors.initials: L
authors.lastname: Carrillo
authors.affiliation: Centro de Biotecnología y Genómica de Plantas (UPM-INIA); Campus de Montegancedo; Pozuelo de Alarcón; Madrid, Spain.
authors.forename: Jesus
authors.initials: J
authors.lastname: Vicente-Carbajosa
authors.affiliation: Centro de Biotecnología y Genómica de Plantas (UPM-INIA); Campus de Montegancedo; Pozuelo de Alarcón; Madrid, Spain.
authors.forename: Joaquín
authors.initials: J
authors.lastname: Medina
authors.affiliation: Centro de Biotecnología y Genómica de Plantas (UPM-INIA); Campus de Montegancedo; Pozuelo de Alarcón; Madrid, Spain.
authors.forename: Stephan
authors.initials: S
authors.lastname: Pollmann
mesh_terms: D000621:Aminoisobutyric Acids / Q000494:pharmacology; D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000378:metabolism*; D001681:Biological Assay; D005030:Ethylenes / Q000096:biosynthesis*; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D007210:Indoleacetic Acids / Q000378:metabolism*; D008031:Lignin / Q000378:metabolism*; D006899:Mixed Function Oxygenases / Q000378:metabolism*; D010641:Phenotype; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development; D030821:Plants, Genetically Modified; D015398:Signal Transduction / Q000187:drug effects / Q000235:genetics
chemical_list: D000621:Aminoisobutyric Acids; D029681:Arabidopsis Proteins; D005030:Ethylenes; D007210:Indoleacetic Acids; C100049:2-aminoisobutyric acid; D008031:Lignin; C036216:ethylene; D006899:Mixed Function Oxygenases; C585335:YUCCA8 protein, Arabidopsis; C585336:YUCCA9 protein, Arabidopsis
keywords: Arabidopsis; YUCCA; auxin; ethylene; lignin biosynthesis; plant hormone interaction
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