CsSPX-PHR/PHL-PHT1 and CsmiR399a-PHO2-PHT1/PHO1 Modules Orchestrate Pi Use Efficiency and Aluminium Tolerance in Tea Plants.

Tea plants activate specific Pi signaling modules to enhance phosphate use efficiency and tolerate aluminium toxicity, with CsPHT1.4 and CsPHT1.5 transporters playing key roles.

• Why it matters: Understanding how tea plants manage phosphate uptake and aluminium stress is crucial for improving growth in acidic soils where these stresses limit productivity, yet the underlying regulatory mechanisms are not well understood.
• What they did: The study characterized Pi signaling components, including CsPHT1.4, CsPHT1.5, CsSPX1a/2, CsPHR1b, and CsmiR399a, analyzing their interactions and responses to Pi, N, and Al/H stresses through functional assays.
• The result: Findings reveal coordinated modules controlling Pi homeostasis and stress responses, providing a foundation for genetic strategies to enhance phosphate efficiency and aluminium tolerance in tea cultivation.