A SNARE-protein has opposing functions in penetration resistance and defence signalling pathways

To overcome the attack of invading pathogens, a plant’s defence system relies on preformed and induced responses. The induced responses are activated following detection of a pathogen, with the subsequent transmission of signals and orchestrated cellular events aimed at eliminating the pathogen and preventing its spread. Numerous studies are proving that the activated signalling pathways are not simply linear, but rather, form complex networks where considerable cross talk takes place. This review covers the recent application of powerful genetic and genomic approaches to identify key defence signalling pathways in the model plant Arabidopsis thaliana (L.) Heynh. The identification of key regulatory components of these pathways may offer new approaches to increase the defence capabilities of crop plants.

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Reciprocal crosstalk between jasmonate and salicylate defence-signalling pathways modulates plant volatile emission and herbivore host-selection behaviour

Journal of Experimental Botany ◽

10.1093/jxb/eru181 ◽

2014 ◽

Vol 65 (12) ◽

pp. 3289-3298 ◽

Cited By ~ 48

Author(s):

Jianing Wei ◽

Joop J. A. van Loon ◽

Rieta Gols ◽

Tila R. Menzel ◽

Na Li ◽

...

Keyword(s):

Host Selection ◽

Signalling Pathways ◽

Volatile Emission ◽

Plant Volatile ◽

Defence Signalling

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ups1, an Arabidopsis thaliana camalexin accumulation mutant defective in multiple defence signalling pathways

The Plant Journal ◽

10.1111/j.1365-313x.2005.02327.x ◽

2005 ◽

Vol 41 (5) ◽

pp. 673-684 ◽

Cited By ~ 26

Author(s):

Katherine J. Denby ◽

Laure J.M. Jason ◽

Shane L. Murray ◽

Robert L. Last

Keyword(s):

Arabidopsis Thaliana ◽

Signalling Pathways ◽

Defence Signalling

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Defence Signalling Pathways Involved in Plant Resistance and Phosphite-Mediated Control of Phytophthora Cinnamomi

Plant Molecular Biology Reporter ◽

10.1007/s11105-013-0645-5 ◽

2013 ◽

Vol 32 (2) ◽

pp. 342-356 ◽

Cited By ~ 24

Author(s):

Leila Eshraghi ◽

Jonathan P. Anderson ◽

Nader Aryamanesh ◽

Jen A. McComb ◽

Bryan Shearer ◽

...

Keyword(s):

Plant Resistance ◽

Phytophthora Cinnamomi ◽

Signalling Pathways ◽

Defence Signalling

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The EXO70B2 exocyst subunit contributes to papillae and encasement formation in anti-fungal defence in Arabidopsis

10.1101/2021.06.20.449050 ◽

2021 ◽

Author(s):

Jitka Ortmannova ◽

Juraj Sekeres ◽

Ivan Kulich ◽

Jiri Santrucek ◽

Petre Dobrev ◽

...

Keyword(s):

Fungal Pathogens ◽

Double Mutant ◽

Penetration Resistance ◽

Membrane Domains ◽

Snare Protein ◽

Membrane Domain ◽

Callose Deposition ◽

Vesicle Tethering ◽

Anti Fungal

In the reaction to non-adapted Blumeria graminis f. sp. hordei (Bg), Arabidopsis thaliana leaf epidermal cells deposit cell wall reinforcements called papillae or seal fungal haustoria in encasements, both of which involve intensive exocytosis. A plant syntaxin SYP121/PEN1 has been found to be of key importance for the timely formation of papillae, and the vesicle tethering complex exocyst subunit EXO70B2 has been found to contribute to their morphology. Here, we identify a specific role for the EXO70B2-containing exocyst complex in the papillae membrane domains important for the callose deposition and GFP-SYP121 delivery to the focal attack sites, as well as its contribution to encasement formation. The mRuby2-EXO70B2 co-localises with the exocyst core subunit SEC6 and GFP-SYP121 in the membrane domain of papillae, and both proteins have the capacity to directly interact. The exo70B2/syp121 double mutant has a reduced number of papillae and haustorial encasements in response to Bg, indicating an additive role of the exocyst in SYP121 coordinated non-host resistance. In summary, we report cooperation between the plant exocyst and a SNARE protein in penetration resistance against non-adapted fungal pathogens.

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