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Poster

Session: Session 2 Presenting Authors at Posters (Odds)

P-411 - Exploring the Role of Extreme Temperatures in Shaping Plant Immunity and Plant-Microbe Interactions

Wednesday, July 16, 2025
13:30 - 15:15  
Location: Confex Hall 3
Plant Regulation of biotic and abiotic stress – trade-offs
Environmental temperature is critical to plant growth, development, and metabolism. Temperature fluctuations or gradual changes in air temperature trigger a wide range of plant responses at multiple levels. Climate change is altering seasonal patterns and increasing extreme weather events and anomalies. These changes also affect plant-microbe interaction. As plants become increasingly susceptible to environmental stress, their associated microbes must also adapt to changing climate. This project aims to investigate the effects of extreme temperatures on plant immunity, plant-microbe interactions, and how temperature shapes plant-microbiome assembly. In the study, we exposed Arabidopsis Col-0 plants to heatwaves (33°C), chilling (4°C), and ambient (21°C) conditions for 16 h, followed by infection with Botrytis cinerea (Bc). We found contrasting disease developments between the heatwave and chilling groups. Compared to the ambient group, the heatwave-treated plants showed more severe symptoms, indicating increased susceptibility. In contrast, the chilling group displayed milder symptoms, indicating lower susceptibility. To further investigate the mechanisms, we subjected jasmonic acid (JA) pathway mutants ora59 and jin1-7 to heatwave conditions followed by Bc infection. Interestingly, the heatwave-induced susceptibility observed in wild-type plants was absent in both mutants, suggesting that the increased susceptibility in wild-type plants is regulated by JA signalling.