Dear!

Its real function is not known. But recent studies showed that G-proteins are involved in signal transduction, activators of plant cell death (PCD) and mediators of stomatal closure signaling. Since PCD and stomatal closure are integral components of plant immunity.

Thanks, Ephrem.

You information is very important for me.

G-protein are involve in array of signalling, in cells, of which only a small proportion of its function has been discovered.

Thaks Kshitij, Your answer helps me to better understand this topic.

I have not found very much information about heterotrimeric G proteins in the plant kingdom.   In fact, there is some controversy as to whether G protein-coupled receptors (GPCRs) exist in plants.  Regardless, signaling pathways in plants are in need of greater elucidation.

Perhaps review of two of the articles I have found related to the matter would be of interest and provide some fundamental information related to your inquiry.  They are:

Do Plants Contain G Protein-Coupled Receptors?

Bruck Taddese2, Graham J.G. Upton, Gregory R. Bailey, Siân R.D. Jordan, Nuradin Y. Abdulla, Philip J. Reeves and Christopher A. Reynolds

and

Heterotrimeric G protein signalling in the plant kingdom

Daisuke Urano, Jin-Gui Chen, José Ramón Botella, Alan M. Jones

In the first, I found the discussion of the "DRY Motif" an interesting and important consideration in the general discussion.  However, my knowledge of GPCRs  and signaling is much more oriented to signaling in animals.  There is quite a bit of information available related to G protein signaling and immunity in animals.

The similarity in the structure is noteworthy, but (I gather) the manner in which signals are transmitted in plants are not the same as in animals.  In my case, I believe that some understanding of the ligands involved in plant systems might allow for further insight to agonist binding and allosteric activation for GPCRs in animals.

I hope these articles and other might assist you in your understanding of G-protein function in plant immunity.  Best wishes.

Dear Daniel.

Thanks for your information, very important.

Bye