Question
Asked 10th Nov, 2017

During a plant-pathogen defense response what happens first the cell expansion or division?

I was analyzing several examples of plant pathogen interaction (pathosystems) and I was wondering if cell expansion comes first or second to cell division. Of course, I must considered that everything happens after a PAMP sequence of events and also to possible recognition of pathogen by plant cells.
Does anybody have some clues?
Thanks and Regards,
Dr. Joao Paulo R. Marques

All Answers (3)

16th Nov, 2017
Rameshsundar Amalraj
Sugarcane Breeding Institute
Actually, the question is very general. As far as, i have understood, the phenomenon of cell division or expansion is highly specific to individual plant-pathogen interactions. Some pathogens suppress cell division (for example, using CLE effectors) to colonize the host, whereas some pathogens modulate hosts' hormonal pathways and induce cell division (for example using AvrPtoB, TAL class effectors, etc.). Therefore, the process of cell division or cell expansion is highly controlled by the presence of certain types of effectors, metabolites and receptors of both pathogen and its host and also depends on the spatial (tissue) conformations, where the interaction is happening.
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16th Nov, 2017
Oussama Ali Bensaci
University of Batna 1
the trophic behavior of certain pathogens may play a role in this question, If you notice, in the case of the biotrophs, the manipulation of the cellular machinery is conceivable in several cases (rust, oidium) as well as in the case of the pathogenic forms of Rhizobiaceae
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18th Nov, 2017
Joao Paulo Rodrigues Marques
University of São Paulo
Dear Colleagues,
The Ideia here is to stimulate an general discussion. Thanks for your contribution. Do you know any metabolic cascade of plant cell from based on PAMP that culminates with cell expansion? To you knowledge there is any specific transcript factor(s) associate(s) with this phenomenon?
I also congrats Dr. Almaraj for the birds eye view answer and also to show me that the architecture of the tissue may ou may not influence this kind of responses. As an anatomist this is important to me.
Regards,
João

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