title: Strigolactones affect lateral root formation and root-hair elongation in Arabidopsis.
abstract: Strigolactones (SLs) have been proposed as a new group of plant hormones, inhibiting shoot branching, and as signaling molecules for plant interactions. Here, we present evidence for effects of SLs on root development. The analysis of mutants flawed in SLs synthesis or signaling suggested that the absence of SLs enhances lateral root formation. In accordance, roots grown in the presence of GR24, a synthetic bioactive SL, showed reduced number of lateral roots in WT and in max3-11 and max4-1 mutants, deficient in SL synthesis. The GR24-induced reduction in lateral roots was not apparent in the SL signaling mutant max2-1. Moreover, GR24 led to increased root-hair length in WT and in max3-11 and max4-1 mutants, but not in max2-1. SLs effect on lateral root formation and root-hair elongation may suggest a role for SLs in the regulation of root development; perhaps, as a response to growth conditions.
authors.affiliation: Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel.
authors.forename: Yoram
authors.initials: Y
authors.lastname: Kapulnik
authors.forename: Pierre-Marc
authors.initials: PM
authors.lastname: Delaux
authors.forename: Natalie
authors.initials: N
authors.lastname: Resnick
authors.forename: Einav
authors.initials: E
authors.lastname: Mayzlish-Gati
authors.forename: Smadar
authors.initials: S
authors.lastname: Wininger
authors.forename: Chaitali
authors.initials: C
authors.lastname: Bhattacharya
authors.forename: Nathalie
authors.initials: N
authors.lastname: Séjalon-Delmas
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Combier
authors.forename: Guillaume
authors.initials: G
authors.lastname: Bécard
authors.forename: Eduard
authors.initials: E
authors.lastname: Belausov
authors.forename: Tom
authors.initials: T
authors.lastname: Beeckman
authors.forename: Evgenia
authors.initials: E
authors.lastname: Dor
authors.forename: Joseph
authors.initials: J
authors.lastname: Hershenhorn
authors.forename: Hinanit
authors.initials: H
authors.lastname: Koltai
mesh_terms: D000704:Analysis of Variance; D017360:Arabidopsis / Q000187:drug effects* / Q000196:embryology*; D007783:Lactones / Q000494:pharmacology*; D009154:Mutation / Q000235:genetics; D038081:Organogenesis / Q000187:drug effects*; D018517:Plant Roots / Q000033:anatomy & histology / Q000187:drug effects* / Q000196:embryology*
chemical_list: C507382:GR24 compound; D007783:Lactones