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Poster

Session: Session 1 Presenting Authors at Posters (Odds)

P-363 - Enhanced disease resistance against Botrytis cinerea by striglactone-mediated priming of camalexin biosynthesis in Arabidopsis

Monday, July 14, 2025
13:30 - 15:15  
Location: Confex Hall 3
Subcellular dynamics and signaling in host-microbe interactions

Strigolactones, a phytohormone regulating shoot branching, have priming effects on the salicylic acid-mediated disease resistance against infection with Psuedomonas syringae.



In this study, to know whether SL-mediated immune priming has effects on other defense signaling pathways, we analyzed the effect of the synthetic SL analogue rac-GR24 on resistance against necrotrophic pathogen Botrytis cinerea in Arabidopsis.  Treatment with rac-GR24 enhanced disease resistance against B. cinerea in the wild-type plants but not in the camalexin biosynthesis-deficient mutant pad3. Expression of the camalexin biosynthesis genes and camalexin accumulation after pathogen infection were enhanced by immune priming in rac-GR24-treated plants. Further analysis revealed that the expression of the ethylene-related genes, the biosynthesis gene ACS6 and the responsive gene ERF1, was enhanced upstream of camalexin biosynthesis, indicating that ethylene-mediated defense signaling was primed by SL-mediated immune priming. In addition, expression of PDF1.2 was also enhanced after infection with B. cinerea, indicating that the defense signaling mediated by ethylene and jasmonate was primed by SL-mediated immune priming. Therefore, SL-mediated immune priming is effective for many types of resistance mechanisms in plant self-defense systems.