title: Strigolactones contribute to shoot elongation and to the formation of leaf margin serrations in Medicago truncatula R108.
abstract: Strigolactones were recently identified as a new class of plant hormones involved in the control of shoot branching. The characterization of strigolactone mutants in several species has progressively revealed their contribution to several other aspects of development in roots and shoots. In this article, we characterize strigolactone-deficient and strigolactone-insensitive mutants of the model legume Medicago truncatula for aerial developmental traits. The most striking mutant phenotype observed was compact shoot architecture. In contrast with what was reported in other species, this could not be attributed to enhanced shoot branching, but was instead due to reduced shoot elongation. Another notable feature was the modified leaf shape in strigolactone mutants: serrations at the leaf margin were smaller in the mutants than in wild-type plants. This phenotype could be rescued in a dose-dependent manner by exogenous strigolactone treatments of strigolactone-deficient mutants, but not of strigolactone-insensitive mutants. Treatment with the auxin transport inhibitor N-1-naphthylphtalamic acid resulted in smooth leaf margins, opposite to the effect of strigolactone treatment. The contribution of strigolactones to the formation of leaf serrations in M. truncatula R108 line represents a novel function of these hormones, which has not been revealed by the analysis of strigolactone mutants in other species.
authors.affiliation: Université de Toulouse, UPS, Laboratoire de Recherche en Sciences Végétales (LRSV), UMR5546, Castanet-Tolosan, France CNRS, UMR5546, Castanet-Tolosan, France.
authors.forename: Dominique
authors.initials: D
authors.lastname: Lauressergues
authors.affiliation: Université de Toulouse, UPS, Laboratoire de Recherche en Sciences Végétales (LRSV), UMR5546, Castanet-Tolosan, France CNRS, UMR5546, Castanet-Tolosan, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: André
authors.affiliation: Plant Biology Division, The Samuel Roberts Noble Foundation, Ardmore, Oklahoma 73401, USA.
authors.forename: Jianling
authors.initials: J
authors.lastname: Peng
authors.affiliation: Plant Biology Division, The Samuel Roberts Noble Foundation, Ardmore, Oklahoma 73401, USA.
authors.forename: Jiangqi
authors.initials: J
authors.lastname: Wen
authors.affiliation: Plant Biology Division, The Samuel Roberts Noble Foundation, Ardmore, Oklahoma 73401, USA.
authors.forename: Rujin
authors.initials: R
authors.lastname: Chen
authors.affiliation: Institut des Sciences du Végétal, CNRS, Saclay Plant Sciences, Avenue de la terrasse, 91198, Gif Sur Yvette, France.
authors.forename: Pascal
authors.initials: P
authors.lastname: Ratet
authors.affiliation: Plant Biology Division, The Samuel Roberts Noble Foundation, Ardmore, Oklahoma 73401, USA.
authors.forename: Million
authors.initials: M
authors.lastname: Tadege
authors.affiliation: Plant Biology Division, The Samuel Roberts Noble Foundation, Ardmore, Oklahoma 73401, USA.
authors.forename: Kirankumar S
authors.initials: KS
authors.lastname: Mysore
authors.affiliation: Université de Toulouse, UPS, Laboratoire de Recherche en Sciences Végétales (LRSV), UMR5546, Castanet-Tolosan, France CNRS, UMR5546, Castanet-Tolosan, France rochange@lrsv.ups-tlse.fr.
authors.forename: Soizic F
authors.initials: SF
authors.lastname: Rochange
mesh_terms: D007783:Lactones / Q000378:metabolism*; D046913:Medicago truncatula / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D010641:Phenotype; D010937:Plant Growth Regulators / Q000378:metabolism*; D018515:Plant Leaves / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D018520:Plant Shoots / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism
chemical_list: D007783:Lactones; D010937:Plant Growth Regulators
keywords: Medicago truncatula; elongation; leaf; mutant; phytohormone; shoot; strigolactone.