20.500.12556/DiRROS-20247 The StPti5 ethylene response factor acts as a susceptibility factorby negatively regulating the potato immune responseto pathogens Ethylene response factors (ERFs) have been associated with biotic stress in Arabidopsis, while their function in non-model plants is still poorly understood. Here we investigated the role of potato ERF StPti5 in plant immunity. We show that StPti5 acts as a susceptibility factor. It negatively regulates potato immunity against potato virus Y and Ralstonia solanacearum, pathogens with completely different modes of action, and thereby has a different role than its orthologue in tomato. Remarkably, StPti5 is destabilised in healthy plants via the autophagy pathway and accumulates exclusively in the nucleus upon infection. We demonstrate that StEIN3 and StEIL1 directly bind the StPti5 promoter and activate its expression, while synergistic activity of the ethylene and salicylic acid pathways is required for regulated StPti expression. To gain further insight into the mode of StPti5 action in attenuating potato defence responses, we investigated transcriptional changes in salicylic acid deficient potato lines with silenced StPti5 expression. We show that StPti5 regulates the expression of other ERFs and downregulates the ubiquitin-proteasome pathway as well as several proteases involved in directed proteolysis. This study adds a novel element to the complex puzzle of immune regulation, by deciphering a two-level regulation of ERF transcription factor activity in response to pathogens. ethylene response factor immune signalling potato virus Y Pti5 Ralstonia solanacearum Solanum tuberosum susceptibility factor krompir interakcije med patogenom in gostiteljem transkriptomski odziv medsebojni vpliv signalnih poti true false true Angleški jezik Slovenski jezik Neznano 2024-08-29 16:30:02 2024-08-29 16:30:03 2024-08-31 03:36:10 0000-00-00 00:00:00 2024 0 0 Nasl. z nasl. zaslona; Soavtorji: Tjaša Lukan, Katja Stare, Maja Zagorščak, Tjaša Mahkovec Povalej, Špela Baebler, Salomé Prat, Núria Sánchez Coll, Marc Valls, Marko Petek, Kristina Gruden; Opis vira z dne 23. 8. 2024; str. 1-17 iss. Vol. 2024 0000-00-00 Zaloznikova VTisku NiDoloceno 0000-00-00 0000-00-00 2024-08-11 581 1469-8137 10.1111/nph.20004 205111043 https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.20004 1 74361a1d-6602-11ef-b487-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=28371 RAZ_Coll_Rius_Anna_2024.pdf RAZ_Coll_Rius_Anna_2024.pdf 1 E5EC2E8067DEC17697353609B767D82F a2b170828dae877eea7af2dcb27336d38b8f5c01294598ff5898189a7629e08c b647a3b9-6602-11ef-b487-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=28372 Nacionalni inštitut za biologijo 0 0 0