A natural brake tunes early calcium signaling and salt tolerance in rice.

TOLS1, a non-canonical GAP-like protein, is identified as a naturally variable negative regulator of salt tolerance in rice, affecting early calcium signaling.

• Why it matters: Understanding genetic regulators of salt tolerance is crucial for improving crop resilience amid increasing soil salinity. This work addresses the gap in knowledge about natural genetic variation influencing early stress responses in rice.
• What they did: The study links TOLS1 to OsRacB and cytosolic Ca2+ signaling, demonstrating how crop alleles can quantitatively modulate initial cellular stress responses through these molecular interactions.
• The result: Findings suggest that TOLS1's regulation of calcium signaling provides a mechanism to tune rice salt tolerance, enabling potential genetic strategies for crop improvement.