Coordination of cyclic electron flow and alternative electron sinks adjusts photosynthetic regulation in maize under fluctuating light during combined heat and drought stress.

Cyclic electron flow and alternative electron sinks collaboratively protect maize photosystems, reducing photoinhibition under fluctuating light combined with heat and drought stresses.

• Why it matters: Understanding these regulatory mechanisms is crucial for improving crop resilience amid increasingly variable climate conditions that threaten agricultural productivity.
• What they did: The study measured chlorophyll fluorescence, P700 redox state, and electrochromic shift signals in maize leaves exposed to fluctuating light alongside heat and drought stresses, focusing on electron flow dynamics.
• The result: Enhanced cyclic electron flow and activation of alternative electron sinks during stress conditions mitigated PSI photoinhibition, revealing key strategies for photosynthetic regulation in C4 crops facing environmental challenges.