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Poster

Session: Session 2 Presenting Authors at Posters (Evens)

P-404 - Contribution of the calcium sensor CML8 in Arabidopsis and tomato defence responses against Ralstonia solanacearum and elevated temperature.

Thursday, July 17, 2025
13:30 - 15:15  
Location: Confex Hall 3
Plant Regulation of biotic and abiotic stress – trade-offs

Under natural conditions, plants have to cope with several biotic and abiotic constraints simultaneously. In the context of global warming, climate scenarios predict an increase in temperature, which negatively affects most of the sources of resistance used by plants. However, the mechanisms involved in plant responses to combined biotic and abiotic stresses are poorly understood. Interestingly, the response to combined stresses is not necessarily additive and can be considered as a unique response. Calmodulin-like calcium sensor proteins (CMLs) are known to be involved in the response to both temperature variation and pathogen attack. Previous work has shown that CML8 in Arabidopsis is i) a positive regulator of several pathogens, including the soil-borne pathogen Ralstonia solanacearum, and ii) involved in brassinosteroid pathways known to contribute to the temperature response in plants. Here, we show that CML8 is differentially regulated by inoculation, temperature and stress combination, and that CML8 still confers better tolerance to R. solanacearum at 30°C in both Arabidopsis and tomato. The underlying mechanisms of the CML8-dependent response to the combined stresses (R. solanacearum inoculation and temperature elevation) are currently being investigated using RNAseq and the identification of CML8 interactors.