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Significance Given the lack of a nervous system in plants, signaling molecules, such as Ca2+ , are of vital importance for perceiving environmental stimuli. However, little information on the genes that control this network is available. Our demonstration thatArabidopsis CCX2, localized to the endoplasmic reticulum, modulates osmotic stress responses through the regulation of cytosolic and endoplasmic reticulum Ca2+ concentrations is one more step toward identifying all the players involved in plant stress responses. The elucidation of these pathways will help to meet the necessary requirements to face global challenges, such as high salinity on the world’s surface, including arable land. This work sheds light on an as yet uncharacterized and key player that tunes intracellular Ca2+ homeostasis, with particular significance for plants under salt stress.

Endoplasmic reticulum-localized CCX2 is required for osmotolerance by regulating ER and cytosolic Ca 2+ dynamics in Arabidopsis

Endoplasmic reticulum-localized CCX2 is required for osmotolerance by regulating ER and cytosolic Ca ²⁺ dynamics in Arabidopsis