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An Immune-Responsive Cytoskeletal-Plasma Membrane Feedback Loop in Plants

Sassmann, Stefan; Rodrigues, Cecilia; Milne, Stephen W.; Nenninger, Anja; Allwood, Ellen; Littlejohn, George R.; Talbot, Nicholas J.; Soeller, Christian; Davies, Brendan; Hussey, Patrick J.; Deeks, Michael J.

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Stefan Sassmann

Cecilia Rodrigues

Stephen W. Milne

Anja Nenninger

Ellen Allwood

George R. Littlejohn

Nicholas J. Talbot

Christian Soeller

Brendan Davies

Michael J. Deeks


Cell wall appositions (CWAs) are produced reactively by the plant immune system to arrest microbial invasion through the local inversion of plant cell growth. This process requires the controlled invagination of the plasma membrane (PM) in coordination with the export of barrier material to the volume between the plant PM and cell wall. Plant actin dynamics are essential to this response, but it remains unclear how exocytosis and the cytoskeleton are linked in space and time to form functional CWAs. Here, we show that actin-dependent trafficking to immune response sites of Arabidopsis thaliana delivers membrane-integrated FORMIN4, which in turn contributes to local cytoskeletal dynamics. Total internal reflection fluorescence (TIRF) microscopy combined with controlled induction of FORMIN4-GFP expression reveals a dynamic population of vesicular bodies that accumulate to form clusters at the PM through an actin-dependent process. Deactivation of FORMIN4 and its close homologs partially compromises subsequent defense and alters filamentous actin (F-actin) distribution at mature CWAs. The localization of FORMIN4 is stable and segregated from the dynamic traffic of the endosomal network. Moreover, the tessellation of FORMIN4 at the PM with meso-domains of PEN3 reveals a fine spatial segregation of destinations for actin-dependent immunity cargo. Together, our data suggest a model where FORMIN4 is a spatial feedback element in a multi-layered, temporally defined sequence of cytoskeletal response. This positional feedback makes a significant contribution to the distribution of actin filaments at the dynamic CWA boundary and to the outcomes of pre-invasion defense.

Journal Article Type Article
Acceptance Date May 4, 2018
Online Publication Date Jun 21, 2018
Publication Date Jul 9, 2018
Deposit Date Jun 22, 2018
Publicly Available Date Jun 22, 2018
Journal Current Biology
Print ISSN 0960-9822
Publisher Cell Press
Peer Reviewed Peer Reviewed
Volume 28
Issue 13
Pages 2136-2144
Public URL


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