Conclusions générales et perspectives "
C. Model Legume Congress "
Il" s’agissait" de" la" première" édition" autonome" de" ce" congrès" qui" était" antérieurement" satellite" de" congrès"plus"importants."
Medicago) truncatula& Immune& Response& To& A& Root& Pathogen& & Involve& MtNFP,& A& LysM& Protein&
Acting&In&&Symbiotic&Nod&Factor&Perception&
Thomas& Rey1,& Clare& Gough2,& Julie& Cullimore2,& &Jean& Jacques& Bono1&,Maxime& Bonhomme1,& Amaury& Nars1,&Bernard&Dumas1&and&Christophe&Jacquet1&
10UMR5546,0Pôle0de0biotechnologie0Végétale,0240chemin0de0Borde0Rouge0313260Castanet%Tolosan,0 FRANCE0
2"LIPM,"UMR"441P2594"PINRAPCNRS""BP"52627"chemin"de"Borde"Rouge"P"Auzeville"31326"Castanet" Tolosan"FRANCE"
Interactions"between"plants"and"soilPborn"microorganisms"have"a"crucial"impact"on"ecosystems"and" crop" productivity," as" they" may" lead" to" parasitism" or" symbiosis" depending" on" the" nature" of" the" interacting" microorganism." During" the" last" few" years," several" results" obtained" in" different" plant" species"underlined"structural"and"biochemical"similarities"between"microbial"signals"and"their"plant" receptors,"required"either"for"symbiosis"establishment"or"for"defence"activation."As"an"example,"the"
Nod" factors" (NFs)" produced" by" soilPbacteria," called" Rhizobia," are" key" signal" molecules" to" promote" symbiotic" interactions" with" Legumes." NFs" contain" a" chitosaccharidic" moiety" and" their" perception" involved" LysM" receptors," such" as" the" Medicago0 truncatula" (M.t.)" proteins" NFP" and" LYK3." In" plant" pathogen" interactions," LysM" receptors" play" also" a" key" role" in" the" perception" of" chitin" fragments" which" are" considered" as" Pathogen" Associated" Molecular" Patterns" (PAMPs)." This" comparison" raises" the"question"of"how"plants"are"able"to"distinguish"friends"and"foes"and"whether"molecular"crosstalk"is" involved"in"mechanisms"leading"to"rejection"or"acceptance"of"the"microbe."To"answer"these"issues," the"model"legume"Medicago0truncatula0(M.t.)"was"particularly"well"suited"as"mutants"impaired"in"NF" perception"was"available"in"the"genetic"background"of"the"A17"M0t."reference"line"and"ii)"A17"was" shown"to"be"resistant"to"the"root"oomycete"Aphanomyces0euteiches."Screening"of""several"NFP"and" LYK3" " allelic" mutants" as" well" as" a" double" mutant" upon" A.0 euteiches" infection" showed" that" all" nfp" plants"displayed"a"significantly"reduced"resistance"level"to"this"oomycete"compared"to"the"A17"WT." Further"cytological,"transcriptomic,"and"elicitation"assays"highlight"the"role"of"this"LysM"receptor"in" perception" of" compounds" released" by" Ae" and" improved" our" understanding" of" the" mecanisms" controlled"by"NFP"for"resistance"to"this"parasite."These"last"recent"advances"will"be"discussed"there." "
This" work" was" funded" in" part" by" the" French" Agence" Nationale" de" la" Recherche" (contractANRP08P BLANP0208P01“Sympasignal”)." " " " " " " " " " " "
Références
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