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An Evolutionarily Conserved Receptor-like Kinases Signaling Module Controls Cell Wall Integrity During Tip-Growth

Du 20/06/2019 au 20/06/2019
 Aurélien Boisson (Botanical Institute Köln, Germany)

​Conférencier :  Aurélien Boisson (Botanical Institute Köln, Germany) invité par Nathalie Léonhardt (BIAM/SAVE)

Abstract :

When plants colonized the land more than 470 MYA, they had to cope with a drastically different, water-deprived environment, that constituted a major driving force for adaptative innovations. Some of these, such as acquisition of rooting cells or pollen tubes made use of the robust tip-growth. The latter relies on a tight coordination between the internal growth machinery and its exposed cell wall. This coordination is monitored by cell wall integrity (CWI) maintenance mechanisms that have been revealed for root hair and pollen tube growth in the seed plant Arabidopsis thaliana. CWI is controlled by Malectin-like receptor kinases (MLRs) such as AtANXUR1 and AtFERONIA, acting upstream of the PTI1-like kinase AtMARIS. Here, we show that CWI during rhizoid growth in the liverwort Marchantia polymorpha, is governed by an MLR and PTI1-like ancestral module. Rhizoids, root hairs and pollen tubes all respond similarly to disruption and overexpression of MLR and PTI1-like encoding genes. Thus, CWI mechanisms of A. thaliana and M. polymorpha, a close relative of the first plants to colonize the land, share a conserved MLR/PTI1-like signaling module that was likely present in their last common ancestor.

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