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SUMMARY:Inhospitable: early signalling events during cereal symbiosis - En
 rico Gobbato (Paszkowski Lab)
DTSTART:20150115T130000Z
DTEND:20150115T133000Z
UID:TALK56591@talks.cam.ac.uk
CONTACT:Stephanie Swarbreck
DESCRIPTION:Symbiosis with arbuscular mycorrhizal (AM) fungi of the Glomer
 omycota phylum is very ancient and widespread in the plant kingdom. Its es
 tablishment is mediated through a molecular dialogue involving release and
  perception of multiple signals from both symbionts. Its earliest stages w
 hile being the most critical are also the least well understood. Mutationa
 l analyses led to identification of multiple genes essential for mycorrhiz
 al colonization\, including the so called Sym genes also required in nodul
 ation\, but to date the mutation of none of them results in the suppressio
 n of all plant responses to AM fungi. Here we describe the rice iho mutant
 \, which is completely unresponsive to AM fungi as monitored microscopical
 ly and by early marker genes expression. Normal susceptibility and gene in
 duction in response to both pathogenic and endophytic fungi shows the spec
 ific contribution of IHO to AM fungal perception. Genetic complementation 
 experiments demonstrated that the IHO gene encodes for an alpha-beta hydro
 lase\, which also mediates developmental responses in rice. The previous i
 dentification of multiple alpha beta hydrolases as receptors (e.g. GID1 an
 d SABP3) makes IHO a very strong candidate receptor of AM signals while it
 s redundancy in legume genomes but not in rice explains the failure in its
  identification in previous screenings. Global gene profiling experiments 
 in response to developmental and AM fungal signals define the signaling ev
 ents mediated by IHO and generate novel information on the earliest molecu
 lar events of AM symbiosis.
LOCATION:Department of Plant Sciences\, Large Lecture Theatre
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