title: Sl-IAA27 gene expression is induced during arbuscular mycorrhizal symbiosis in tomato and in Medicago truncatula.
abstract: Aux/IAA genes play a pivotal role in auxin transcriptional regulation. Their functions were mainly studied in Arabidopsis through analysis of gain-of-function mutants. In the tomato, the Solanaceae reference species, different studies on Sl-IAA down-regulated lines showed specific role for Sl-IAA genes. Our recent work revealed that the Sl-IAA 27 gene displays a distinct behavior compared with most Aux/IAA genes, being down-regulated by auxin. Interestingly, the silencing of Sl-IAA27 leads to altered chlorophyll accumulation in leaves, reduced fertilization, altered fruit development and altered root formation. Here we report that IAA27 could be a key auxin signaling gene involved in AM in tomato and also in Medicago model plant. Indeed both Sl-IAA27 and its closest homolog in Medicago truncatula, Mt-IAA27, are overexpressed in mycorrhized roots. These data are in line with the putative role of auxin in arbuscular mycorrhization.
authors.forename: Carole
authors.initials: C
authors.lastname: Bassa
authors.forename: Mohammad
authors.initials: M
authors.lastname: Etemadi
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Combier
authors.forename: Mondher
authors.initials: M
authors.lastname: Bouzayen
authors.forename: Corinne
authors.initials: C
authors.lastname: Audran-Delalande
mesh_terms: D002734:Chlorophyll / Q000378:metabolism; D018551:Solanum lycopersicum / Q000378:metabolism* / Q000382:microbiology*; D046913:Medicago truncatula / Q000378:metabolism* / Q000382:microbiology*; D038821:Mycorrhizae / Q000502:physiology*; D018515:Plant Leaves / Q000378:metabolism / Q000382:microbiology; D013559:Symbiosis / Q000502:physiology
chemical_list: D002734:Chlorophyll