PpPKp1 Coordinates Growth and Cold Tolerance by Integrating Energy-Cytokinin Signalling via Pyruvate Metabolism in Poa pratensis.

PpPKp1 from Poa pratensis var. anceps cv. Qinghai is strongly induced by low temperature and drought and enhances cold tolerance by boosting plastid pyruvate metabolism.

• Why it matters: Cold response networks that connect central carbon metabolism to hormone signalling are still unclear, limiting targeted strategies to improve plant performance under chilling stress.
• What they did: The study overexpressed or RNAi-suppressed PpPKp1 in Arabidopsis thaliana and Poa pratensis, then measured pyruvate kinase activity/content and growth, ROS stability, and metabolic/hormone pathway flux under cold.
• The result: Under cold stress, PpPKp1 increases glycolytic/TCA flux and coordinates arginine biosynthesis with cytokinin signalling transduction, supporting growth and development and significantly enhancing cold tolerance.

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