Geonhee Hwang

Plants, as sessile organisms, must continually adapt to fluctuating temperatures to ensure survival. The plasma membrane‐localized receptor‐like kinase FERONIA (FER) coordinates diverse physiological processes and responses to various biotic and abiotic stresses. However, the role of FER in plant adaptation to elevated temperatures remains largely unexplored. Here, we report that FER is indispensable for plant growth and survival at warm temperatures. We found that fer loss‐of‐function mutants exhibit impaired thermomorphogenic growth and are hypersensitive to mild heat stress, displaying extensive oxidative stress‐mediated cell death at elevated temperatures. Combined genetic and molecular analyses revealed that these temperature‐sensitive defects in fer mutants are caused by an overaccumulation of jasmonic acid (JA), which subsequently triggers excessive production of reactive oxygen species. Furthermore, we show that this aberrant JA accumulation and oxidative stress are attributable to impaired FER‐mediated regulation of turgor‐dependent cell wall tensile stress. Taken together, our results suggest that FER‐mediated cell wall tensile stress regulation serves as a critical mechanism to prevent aberrant JA accumulation and oxidative stress at sustained elevated temperatures, thereby enabling plants to adapt to and survive under such conditions.