Úloha vybraných podjednotek komplexu exocyst v odpovědi rostlin na patogena

Sabol, Peter

In the recent years, there has been a growing number of publications indicating at the involvement of plant secretory pathway in defense against phytopathogens. Specifically, roles of plant exocyst complex have been explored in deeper detail in current research. Yet, exactly how exocyst- mediated exocytosis contributes to secretion of antimicrobials and cell wall-based defense remains unclear. In the presented Dissertation, I provide both experimental evidence and devise further hypotheses on selected exocyst's subunits in plant immune reactions. Particularly, I show that EXO70B1 exocyst subunit interacts with immunity-related RIN4 protein. Cleavage of RIN4 by AvrRpt2 Pseudomonas syringae effector protease releases both RIN4 fragments and EXO70B1 from the plasma membrane when transiently expressed in Nicotiana benthamiana leaves. I speculate on how this might have an implication in regulation of polarized callose deposition. In a co-authored opinion paper, we also hypothesize that EXO70B1-mediated autophagic degradation of TN2 resistance protein prevents its hyperactivation and lesion mimic phenotype development. In addition, in collaboration with my colleagues, I present data on EXO70H4's engagement in PMR4 callose synthase secretion, required for silica deposition. Representing a possible...

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